Design, synthesis, characterization, and antimicrobial activity of the new 2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlo-rophenol and its complexes with Co(II), Ni(II), Cu(II) and Zn(II): An experimental and DFT study
J. Serb. Chem. Soc. 81 (5) 509–520 (2016) UDC 542.9+547.571’551+546.302:519.677:
JSCS–4864 615.281/.282–188
Original scientific paper
509
Design, synthesis, characterization, and antimicrobial activity of
the new 2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlo-
rophenol and its complexes with Co(II), Ni(II), Cu(II) and
Zn(II): An experimental and DFT study
EMINE GULHAN BAKIRDERE1*, MEHMET FERDI FELLAH2**, ERDAL
CANPOLAT3, MEHMET KAYA4 and SEHER GÜR5
1Department of Science Education, Yıldız Technical University, 34220, İstanbul, Turkey,
2Department of Chemical Engineering, Bursa Technical University, 16190, Bursa, Turkey,
3Department of Science and Mathematics for Secondary Education, Fırat University, 23119,
Elazığ, Turkey, 4Department of Chemistry, Fırat University, 23119, Elazığ, Turkey and
5Department of Biology, Fırat University, 23119, Elazığ, Turkey
(Received 30 October, revised 28 December, accepted 29 December 2015)
Abstract: In this study, the complexes of Co(II), Ni(II), Cu(II) and Zn(II) with
2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlorophenol were prepared and
characterized by physical, spectral and analytical data. The metal:ligand
stoichiometric ratio was 1:2 in all the complexes. The results suggested that the
Schiff bases were coordinated to the metal ions through the phenolic oxygens
and the azomethine nitrogen to give mononuclear complexes. Their structures
were elucidated based on elemental analysis, IR, 1H- and 13C-NMR, UV–Vis,
and magnetic susceptibility measurements and thermogravimetric analyses.
Both the antibacterial and antifungal activities and the minimum inhibitory
concentration (MIC) values of compounds are reported. Among the tested
compounds, the most effective compound providing an MIC value of 64 µg
mL-1 was Zn(L)2 against Candida tropicalis and Bacillus subtilis. The theo-
retically optimized geometries of the complexes were tetrahedral structures.
The computed stretching frequencies of the C=N, C–O and N–H bonds were in
good agreement with the experimental data. All the calculated frequencies fell
within about 5 % of the experimental frequency regions.
Keywords: Schiff base; transition metal complex; antibacterial and antifungal
activities; DFT.
*,**Corresponding authors. E-mail: (*)bgulhan@yildiz.edu.tr; (**)mffellah@gmail.com,
mferdi.fellah@btu.edu.tr
doi: 10.2298/JSC151030008B
510 BAKIRDERE et al.
INTRODUCTION
Several Schiff base metal complexes have been studied in the past because
of their wide applicability.1 Schiff bases have often been used as chelating
ligands in the field of coordinatiation chemistry for obtaining thermotropic liquid
crystalline polymers and their metal complexes have been used as radio-pharm-
aceuticals for cancer targeting, dioxygen carriers and model systems for bio-
logical macromolecules.2–6 The presence of transition metals in human blood
plasma indicates their importance in the mechanisms for the accumulation, stor-
age and transport of transition metals in living organisms.7
The synthesis and characterization of various transition metal complexes
with novel Schiff bases were experimentally investigated.8–19 In a previous theo-
retical study, 2-{(E)-[(4-aminophenyl)imino]methyl}-6-bromo-4-chlorophenol as
Schiff base ligand and its complexes with Co, Ni, Cu and Zn metals were exam-
ined.19 In the present study, the synthesis and characterization of cobalt(II),
nickel(II), copper(II) and zinc(II) complexes with 2-{(E)-[(4-aminophenyl)-
imino]methyl}-4,6-dichlorophenol (LH) were investigated. All compounds were
characterized by elemental analyses, UV–Vis, IR, and 1H- and 13C-NMR spec-
troscopy, magnetic susceptibility measurements and thermogravimetric analyses
(TGA). Moreover, density functional theory (DFT) calculations were performed
to examine the parameters of the optimized structure and to calculate the IR
spectra of the ligand and its complexes with Co, Ni, Cu and Zn metals in order to
compare them with the experimental data obtained in this study. Additionally, all
the complexes were assayed for their antibacterial activities against two Gram-
positive bacterial strains (Bacillus subtilis and Staphylococcus aureus) and two
Gram-negative bacterial strains (Escherichia coli and Salmonella enterica subsp.
enterica serovar Typhimurium) by the minimum inhibitory concentration (MIC)
method.
EXPERIMENTAL
Methods
Elemental analyses (C, H and N) were realized using a LECO-932 CHNSO analyzer by
the Technical and Scientific Research Council of Turkey (TUBITAK). The IR spectra were
recorded on a Mattson 1000 FT-IR spectrometer as KBr pellets. The NMR spectra were rec-
orded on a Bruker Dpx-400 MHz high performance digital FT-NMR spectrometer. The elec-
tronic spectra were obtained on a Shimadzu UV probe 2.1 spectrometer at the Firat Uni-
versity. Magnetic susceptibilities were determined on a Sherwood scientific magnetic
susceptibility balance (Model MK1) at room temperature using Hg[Co(SCN)4] as the calib-
rant; diamagnetic corrections were calculated from Pascal’s constants. The TG curves were
recorded on a Shimadzu TG-50 thermo-balance.
Preparation of the ligand and its complexes
2-{(E)-[(4-Aminophenyl)imino]methyl}-4,6-dichlorophenol (LH). A solution of 2.16 g
(20 mmol) 1,4-phenylendiamine dissolved in 25 mL absolute ethanol was added dropwise to
1.81 g (10 mmol) 3,5-dichlorosalicylaldehyde and 0.01 g p-toluenesulfonic acid dissolved in
DFT STUDY ON AND ANTIMICROBIAL ACTIVITY OF A DICHLOROPHENOL AND ITS COMPLEXES 511
25 mL absolute ethanol under reflux at 60 °C under continuous stirring for 1 h. After over-
night stirring, the precipitate was filtered off, washed several times with hot water, cold
ethanol and diethyl ether and dried under vacuum.
Bis(2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlorophenolato)cobalt(II), Co(L)2.
The ligand (0.28 g, 1.00 mmol) was dissolved in 25 mL absolute ethanol. A solution of
Co(AcO)2·4H2O (0.13 g, 0.50 mmol) in 25 mL of absolute ethanol was added dropwise over
1 h to the ligand solution under reflux at 60 °C under continuous stirring. After stirring
overnight, the precipitated complex was filtered off, washed several times with hot H2O, cold
EtOH and cold Et2O and dried under vacuum.
Bis(2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlorophenolato)nickel(II), Ni(L)2.
Ni(L)2 was prepared following the same procedure as described for Co(L)2, starting with LH
(0.28 g, 1.00 mmol) and Ni(AcO)2·4H2O (0.12 g, 0.50 mmol).
Bis(2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlorophenolato)copper(II), Cu(L)2.
Cu(L)2 was prepared following the same procedure as described for Co(L)2, starting with LH
(0.28 g, 1.00 mmol) and Cu(AcO)2·H2O (0.10 g, 0.50 mmol).
Bis(2-{(E)-[(4-aminophenyl)imino]methyl}-4,6-dichlorophenolato)zinc(II) Zn(L)2.
Zn(L)2 was prepared following the same procedure as described for Co(L)2, starting with LH
(0.28 g, 1,00 mmol) and Zn(AcO)2·2H2O (0.11 g, 0.50 mmol).
Microbiology
The tested microorganisms were the gram-positive Staphylococcus aureus ATCC 6538P
and Bacillus subtilis ATCC 6633, the gram-negative Escherichia coli ATCC 25922 and Sal-
monella enterica subsp. enterica serovar Typhimurium NRRL B 4420, and the yeast-like
fungi, Candida glabrata ATCC 66032 and Candida tropicalis ATCC 13803. Ampicillin
(Mustafa Nevzat) and fluconazole (Pfizer) were used as antibiotic references for the bacteria
and yeasts, respectively (obtained from the Department of Biology, Fırat University, Turkey).
Antibacterial and antifungal assays. The bacterial cultures were obtained in Mueller–
–Hinton broth (Difco) for all the bacterial strains after 24 h incubation at 37±0.1 °C. The
yeasts were propagated in Sabouraud dextrose broth (Difco) by incubation for 24 h at 25±0.1
°C. Testing was performed in Mueller–Hinton broth and Sabouraud dextrose broth at pH 7.4
for the bacteria and yeast, respectively. The final inoculum size for the bacteria and fungi was
105 CFU mL-1. The test compounds were dissolved in DMSO at an initial concentration of
1024 µg mL-1 and then serially diluted in culture medium to 1 µg mL-1. A set of tubes con-
taining only inoculated broth was kept as the control. The antibacterial activity was deter-
mined after incubation for 24 h at 37 °C for the bacteria and after incubation for 48 h at 25 °C
for the yeasts. The MIC was defined as the lowest concentration of the compounds that
inhibited the visible growth of a microorganism. All experiments in the antibacterial and
antifungal assays to define the MIC values were performed in duplicate.
Computational methods
In the present work, the theoretical calculations were based on DFT20 implemented in
Gaussian 09 software.21 The B3LYP hybrid formalism 22-24 was used for the calculations. The
hybrid method of B3LYP is a high-quality DFT technique for theoretical calculations in
organic chemistry.25 The theoretical approach applied in this study was presented in previous
studies.18,19 The spin contamination value must be very small (less than 10 %).26 The <S2>
values were negligible in this study. Vibrational analysis was also performed to obtain
vibrational frequencies. All vibrational frequencies were obtained for the 6-31g(d,p) method.
All frequency values were scaled using a factor of 0.9613 to reproduce the experimental
512 BAKIRDERE et al.
fundamentals.27 Mulliken population analysis28 was utilized to obtain spin density values
(showing where unpaired electrons of the system are located) of the metal atoms. Natural
bond orbital (NBO)29 analysis was employed to obtain the NBO charge values and the
electronic configurations of the metal atoms. The criteria of convergence in the calculations
were 12×10-4, 18×10-4, 3×10-4 and 45×10-5 for gradients of the root-mean-square (rms) dis-
placement, the max. displacement, the rms of the force and the max. force, respectively.
RESULTS AND DISCUSSION
The ligand (LH) was prepared by reacting equimolar amounts of 1,4-phenyl-
endiamine with 3,5-dichlorosalicylaldehyde in absolute ethanol (Scheme 1). The
structures of the ligand and the complexes were established by the use of their
IR, 1H-NMR and electronic spectra, elemental analyses, magnetic susceptibility
measurements and thermogravimetric analyses.
Scheme 1. Preparation of the ligand.
All the metal complexes with LH were prepared by the stoichiometric reac-
tion of the corresponding metal(II) acetate with LH in the mole ratio M:L = 1:2.
The complexes are stable intensely colored solids. A summary of the elemental
analysis data for ligand and the complexes are given in the Supplementary mat-
erial to this paper.
The elemental analysis results agree with the calculated values showing that
the complexes had 1:2 metal/ligand rations. The elemental analysis also confir-
med the composition of the above-synthesized compounds.
The characteristic IR bands of the ligand and its complexes are given in
Table S-I of the Supplementary material. In the IR spectrum of the ligand, ν(O–H)
(phenolic), ν(C=N) (azomethine), ν(C–O) (phenolic) and ν(N–H) stretching vib-
rations were observed at 3350–3200, 1609, 1290 and 3315 and 3190 cm–1, res-
pectively. These values are in agreement with those observed for similar com-
pounds.14,15 The ν(O–H) band of the phenolic group appeared at ca. 3350–3200
cm–1; its low value was due to the formation of intramolecular hydrogen
bonds.4,30 This band was absent in the spectra of all the complex, indicating the
deprotonation of Schiff base prior to coordination through its oxygen atom.31,32
The azomethine vibration of the ligand at 1609 cm–1 was shifted to lower fre-
quencies after complexation, appearing at 1608, 1607, 1602 and 1608 cm–1 for
cobalt(II), nickel(II), copper(II) and zinc(II) complexes, respectively. This clearly
indicates the coordination of the Schiff base through the azomethine nitro-
DFT STUDY ON AND ANTIMICROBIAL ACTIVITY OF A DICHLOROPHENOL AND ITS COMPLEXES 513
gen.31,32 This is also supported by an increase in the absorption frequency of the
phenolic ν(C–O) band from 1290 cm–1 in the spectrum of the free ligand to
values in the range 1323–1293 cm–1 in the spectra of the complexes, indicating
that the other coordination site of the Schiff base is the phenolic oxygen atom.32
1H- and 13C-NMR spectra of the ligand (LH) were recorded in CDCl3. The
NMR assignments are given in detail in Table S-II of the Supplementary mat-
erial. Characteristic 1H-NMR peaks of the ligand occurred at 15.30 (OH), 7.60
(CH=N) and 5.60–8.90 ppm (Ar-H). The OH (phenolic) signal at 15.30 ppm dis-
appeared upon addition of D2O to the solution, indicating that it is an acidic pro-
ton.15,16,33 The zinc(II) complex did not dissolve in DMSO-d6 and therefore, the
NMR spectra of the zinc (II) complex could not be obtained.
The magnetic susceptibility data of the complexes are given in Table S-III of
the Supplementary material. The Co(II), Ni(II) and Cu(II) complexes were para-
magnetic, while the Zn(II) complex was diamagnetic, as expected for a d10 con-
figuration. According to the magnetic moment calculations, Co(II), Ni(II) and
Cu(II) have three, two and one unpaired electrons, respectively. The magnetic
moments of the Co(II), Ni(II) and Cu(II) complexes at room temperature were
4.45, 2.82 and 1.77 μB, respectively, which are characteristic for mononuclear,
tetrahedral complexes.34,35 In the Zn (II) complex, a tetrahedral structure was
proposed and the diamagnetic behavior was confirmed.36
The electronic spectra of the ligand and the Co(II), Ni(II), Cu(II) and Zn(II)
complexes were recorded in DMSO at room temperature. The aromatic band of
the ligand at 260 nm was attributed to benzene π→π* transitions. The band
around 400 nm is due to the n→π* transition of the non-bonding electrons pre-
sent on the nitrogen of the azomethine group in the Schiff base. All the com-
plexes showed an intense band near 380–435 nm, which was assigned to n→π*
transitions associated with the azomethine linkage.33 The spectra of all the com-
plexes show intense band at ca. 386–450 nm, which can be assigned to charge
transfer transition of the tetrahedral geometry.37
The thermal behaviors of the ligand and all the complexes were investigated
by thermogravimetry in the temperature range from ambient to 600 °C at a heat-
ing rate of 10 °C min–1. Thermogravimetric studies of all the complexes showed
no weight loss up to 230 °C, indicating the absence of lattice/coordinated water
molecules in the complexes.1,38 All these complexes underwent complete decom-
position to the corresponding metal oxides, CoO, NiO, CuO and ZnO.39–43
Based on the experimental results, the suggested structure of the complexes,
where M = Co(II), Ni(II) Cu(II) and Zn(II), is shown in Fig. 1.
A comparative study of MIC values of the Schiff base LH and its complexes
indicated that the metal complexes in general had a better activity than the free
ligand. Such increased activity of the metal chelates could be explained on the
basis of the chelating theory.32 The synthesized Schiff base compounds had com-
514 BAKIRDERE et al.
parable and similar inhibitory effects (low to moderate MIC values ranging from
64 to 512 µg mL–1) on the growth of tested strains (Table I). The antibacterial
results evidently showed that the activity of the Schiff base became more pro-
nounced when coordinated to the metal ions. Thus, all the complexes show high
bactericidal activities against S. enterica, S. aureus and E. coli (MIC = 128 µg
mL–1) and B. subtilis (MIC = 64 µg mL–1) as compared to corresponding Schiff
base. The structure of the tested compounds seemed to be the principal factor
influencing the antimicrobial activity. The present investigations of the antimic-
robial screening data revealed that all of the newly synthesized compounds exhi-
bited poor activities compared to those of the control drugs.
Fig. 1. Experimentally suggested structural
formula of the complexes of the ligand (where
M = Co(II), Ni(II) Cu(II) or Zn(II)).
TABLE I. The in vitro activities of the compounds and the reference drugs (the MIC values
are in µg mL-1)
Sample S. enterica S. aureus E. coli B. subtilis C. tropicalis C. glabrata
LH 256 512 512 128 256 256
Co(L)2 128 128 128 512 256 256
Ni(L)2 128 256 256 128 256 256
Cu(L)2 256 256 256 256 128 256
Zn(L)2 256 256 128 64 64 128
Ampicillin 2 2 2 2 – –
Fluconazole – – – – 8 8
Theoretical
Geometries of the ligand and its complexes with metals were constructed
using the structures experimentally suggested in this study. Initially, the ligand
was optimized by means of equilibrium geometry (EG) calculations. The opti-
mized geometry of the ligand is presented in Fig. 2.
The spin multiplicity (SM) numbers determined for the complexes of the
ligand with Zn, Cu, Ni and Co metals were 1, 2, 3 and 4, respectively. The opti-
mized geometry of the 2-{(E)-[(4-aminophenyl)imino]methyl}-6-bromo-4-chloro-
DFT STUDY ON AND ANTIMICROBIAL ACTIVITY OF A DICHLOROPHENOL AND ITS COMPLEXES 515
phenol complexes with Zn is shown as an example in Fig. 3. In this optimization
calculation, the computed <S2> values confirmed that the spin contamination
was very small (max 0.5 % after annihilation).
Fig. 2. Optimized geometry of the
ligand.
Fig. 3. Optimized geometry of the Zn complex with 6-bromo analogue of L-.
NBO charges with color representation for the optimized complexes are
shown in Fig. 4. The NBO charges, spin density values and electron configur-
ation of metal atoms for the optimized complexes with Zn, Cu, Ni and Co metals
are presented in Table II, from which it can be seen that the metal atoms have a
high spin density, which indicates that the unpaired electrons are localized on the
metal atoms. The optimized complexes with Cu, Ni and Co atoms have distorted
tetrahedral structures, while the complex with a Zn atom has a normal tetrahedral
structure. The reason for this might be that metal atoms in the optimized com-
plexes with Cu, Ni and Co atoms have some spin density whereas the Zn atom
has no spin density in its optimized complex. Additionally, according to Fig. 4,
the atomic charges of the metal atoms in the complexes are higher than those of
the other atoms of the ligands, which show that the metal atoms have the highest
positive character.
516 BAKIRDERE et al.
a) b)
c) d)
e)
Fig. 4. NBO charges with color representation for optimized: a) Zn-complex, b) Ni-complex,
c) Cu-complex and d) Co-complex; e) scale for charges (left side: lowest charge (–) and right
side: highest charge (+)).
TABLE II. NBO charges, spin density values and electron configurations of the metal atoms
of the optimized Zn, Cu, Ni and Co complexes
Metal NBO charge Spin density Electron configuration
Zn 1.297 – [core]4s(0.37)3d(9.91)4p(0.42)5p(0.01)
Cu 1.123 0.683 [core]4s(0.35)3d(9.15)4p(0.37)
Ni 1.162 1.710 [core]4s(0.29)3d(8.16)4p(0.39)
Co 1.229 2.776 [core]4s(0.29)3d(7.13)4p(0.35)
The vibrational frequencies obtained in a previous study for 2-{(E)-[(4-
-aminophenyl)imino]methyl}-6-methoxy-4-nitrophenol and its complexes with
Co, Ni, Cu and Zn metals using the 6-31g(d,p), DGDZVP and CEP-121G basis
sets were relatively similar.18 Thus, in the present study, the vibrational
frequencies were obtained by the 6-31g(d,p) method. The calculated vibrational
frequency values of the C=N, C–O and N–H stretching modes for the optimized
DFT STUDY ON AND ANTIMICROBIAL ACTIVITY OF A DICHLOROPHENOL AND ITS COMPLEXES 517
complexes are tabulated in Table III, from which it could be seen that the
calculated values of the C=N, C–O and N–H stretching frequencies were in good
agreement with experimental frequency data given in Table S-I for the ligand and
its Zn, Cu, Ni and Co complexes. The calculated C=N stretching frequencies for
the ligand and its metal complexes (Zn, Cu, Ni and Co) were 1621, 1574 (1575),
1572 (1575), 1569 (1572) and 1568 (1571) cm–1, respectively. The experimental
frequencies were 1609, 1608, 1602, 1607 and 1608 cm–1, respectively. The
stretching frequencies of the C–O mode were computed as 1272, 1304 (1306),
1305 (1307), 1304 (1307) and 1303 (1304) cm–1 for the ligand and its Zn, Cu, Ni
and Co complexes, respectively. The corresponding experimental frequency
values were 1290, 1293, 1323, 1295 and 1294 cm–1, respectively. The N–H
stretching frequencies were also similar to the corresponding experimental IR
bands. Consequently, all calculated frequencies fell within 5.1 % of the
experimental frequency region reported in this study. This is a reasonable error
region as pointed out in the literature.44
TABLE III. The calculated vibrational frequency values (cm-1) for the optimized ligand and
its complexes
Frequency type Ligand
Complex
Zn Cu Ni Co
C=N stretching 15C=14N 1621 1574 1572 1569 1568
40C=39N 1575 1575 1572 1571
C–O stretching 16C–27O 1272 1304 1305 1304 1303
49C–60O 1306 1307 1307 1304
N–H symmetrical stretching 11N–12H, 13H 3440 3438 3436 3437 3438
36N–37H, 38H 3440 3438 3440 3440
N–H anti-symmetrical
stretching
11N–12H, 13H 3546 3541 3539 3540 3541
36N–37H, 38H 3545 3542 3545 3544
CONCLUSIONS
Many Schiff-base derivatives containing a substituted aromatic amine have
been synthesized, characterized and used for complexation of transition metals.
Functional groups, such as amines are very far removed from the pendants par-
ticipating in the complexation and have no effect on the complexes. TGA and
elemental analysis indicated no lattice/coordinated water molecules in the com-
plexes. The satisfactory analytical data and all of the physicochemical studies
suggested that these complexes might be formulated as M(L)2. DFT calculations
with the B3LYP method/6-31g(d,p) basis set were performed on the optimized
structures and the vibrational IR spectra of the ligand and its Co, Ni, Cu and Zn
complexes. The optimized geometries of complexes were tetrahedral structures.
The calculated stretching frequency values of the C=N, C–O and N–H bonds
were in good agreement with experimental frequency data reported in this study
518 BAKIRDERE et al.
for the ligand and its Zn, Cu, Ni and Co complexes. All the calculated frequen-
cies fell within about 5 % of the experimental frequency regions. The antibac-
terial data given for the compounds presented in this paper indicated that the anti-
microbial activity of metal complexes depended on the structure of the tested
compound. The sensitivity spectrum of the microbial strains towards the ligand
and the corresponding complexes was determined by qualitative and quantitative
methods. The quantitative antimicrobial activity test results proved that both the
ligand and complex combinations have specific antimicrobial activity, depending
on the microbial species tested. Although none of the presented compounds was
as effective against the tested microorganisms as the used reference drugs, the
determination of their antibacterial activity against other Gram-negative and
Gram-positive strains is in progress.
SUPPLEMENTARY MATERIAL
Detailed physical, analytical and spectral data for the ligand and its Zn, Cu, Ni and Co
complexes are available electronically from http://www.sbd.org.rs/JSCS/ or from the cor-
responding author on request.
Acknowledgement. This work was supported by the Management Unit of Scientific
Research Projects of Fırat University (Project: FÜBAP 1276).
И З В О Д
СИНТЕЗА, КАРАКТЕРИЗАЦИЈА, АНТИБАКТЕРИЈСКА И АНТИФУНГАЛНА
АКТИВНОСТ 2-{(E)-[(4-АМИНОФЕНИЛ)ИМИНО]МЕТИЛ}-4,6-ДИХЛОРОФЕНОЛА И
ОДГОВАРАЈУЋИХ Co(II), Ni(II), Cu(II) И Zn(II) КОМПЛЕКСА: ЕКСПЕРИМЕНТАЛНО И
DFT ИСПИТИВАЊЕ
EMINE GULHAN BAKIRDERE1, MEHMET FERDI FELLAH2, ERDAL CANPOLAT3, MEHMET KAYA4 и SEHER GÜR5
1
Department of Science Education, Yıldız Technical University, 34220, İstanbul, Turkey, 2Department of
Chemical Engineering, Bursa Technical University, 16190, Bursa, Turkey,
3
Department of Science and
Mathematics for Secondary Education, Fırat University, 23119, Elazığ, Turkey, 4Department of Chemistry,
Fırat University, 23119, Elazığ, Turkey и 5Department of Biology, Fırat University, 23119, Elazığ, Turkey
У овом раду су синтетисани и окарактерисани физичкохемијским методама
комплекси Co(II), Ni(II), Cu(II) и Zn(II) са 2-{(E)-[(4-аминофенил)имино]метил}-4,6-ди-
хлорофенолом. Стехиометријски однос метала и лиганда у свим комплексима је 1:2. На
основу добијених резултата, може се претпоставити да се Шифова база координује за
јоне метала преко фенолног атома кисеоника и азометинског атома азота, при чему
настају мононуклеарни комплекси. Структуре комплекса су одређене применом еле-
менталне микроанализе, IR, 1H- и 13C-NMR спектроскопије, UV–Vis спектрофото-
метрије, мерењем магнетне сусцептибилности и термогравиметријском анализом. При-
меном DFT методе нађено је да комплекси имају тетраедарску структуру. Теоријски
израчунате вредности за фреквенције C=N, C–O и N–H веза су у сагласности са експе-
рименталним подацима, при чему израчунате вредности одступају до 5 % од експери-
ментално одређених фреквенција. Испитивана је антибактеријска и антифунгална
активност синтетисаних једињења и добијени резултати су приказани у облику MIC
вредности. Од свих испитиваних једињења, Zn(L)2 комплекс показује највећу активност
DFT STUDY ON AND ANTIMICROBIAL ACTIVITY OF A DICHLOROPHENOL AND ITS COMPLEXES 519
према микроорганизмима Candida tropicalis and Bacillus subtilis, при чему је MIC вред-
ност 64 μg mL-1.
(Примљено 30. октобра, ревидирано 28. децембра, прихваћено 29. децембра 2015)
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/ENU (Use these settings to create Adobe PDF documents best suited for high-quality prepress printing. Created PDF documents can be opened with Acrobat and Adobe Reader 5.0 and later.)
>>
/Namespace [
(Adobe)
(Common)
(1.0)
]
/OtherNamespaces [
<<
/AsReaderSpreads false
/CropImagesToFrames true
/ErrorControl /WarnAndContinue
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/IncludeGuidesGrids false
/IncludeNonPrinting false
/IncludeSlug false
/Namespace [
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(InDesign)
(4.0)
]
/OmitPlacedBitmaps false
/OmitPlacedEPS false
/OmitPlacedPDF false
/SimulateOverprint /Legacy
>>
<<
/AddBleedMarks false
/AddColorBars false
/AddCropMarks false
/AddPageInfo false
/AddRegMarks false
/ConvertColors /ConvertToCMYK
/DestinationProfileName ()
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/Downsample16BitImages true
/FlattenerPreset <<
/PresetSelector /MediumResolution
>>
/FormElements false
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/MultimediaHandling /UseObjectSettings
/Namespace [
(Adobe)
(CreativeSuite)
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]
/PDFXOutputIntentProfileSelector /DocumentCMYK
/PreserveEditing true
/UntaggedCMYKHandling /LeaveUntagged
/UntaggedRGBHandling /UseDocumentProfile
/UseDocumentBleed false
>>
]
>> setdistillerparams
<<
/HWResolution [2400 2400]
/PageSize [612.000 792.000]
>> setpagedevice