Microsoft Word - 102-112 102 | Chemistry 2016) عام 1(العدد 29المجلد مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 Synthesis and Characterization of Some New Mixed- Ligand Complexes Containing Schiff Base and 3-Picoline with Some Metal Salts Basima M. Sarhan Dept. of Chemistry / College of Education for Pure Sciences (Ibn Al-Hatham)/ University of Baghdad Modher Y. Mohammad Thaer M. Salman Dept. of Chemistry / College of Education for Girls / University of Tikrit Received in:26/May/2015،Accepted in:30/June/2015 Abstract Some metal ions (Mn+2, Co+2, Ni+2, Cu+2,Zn+2 and Cd+2) complexes of quodridentats Schiff base derived from (2-hydroxy benzaldehyde and 4,4'-methylenedianiline as primary ligand and 3-picoline (3-pic) secondary ligand have been synthesized and characterized on the basis of their 1H ,13C-NMR, FT-IR, UV-Vis spectroscopy, conductivity measurements, elemental analysis, and magnetic moments, metal to ligands ratio in all complexes has been found to be (1:1:2) (M:Schiff base:3-pic), Schiff base behaves as neutral tetra dentate ligand with (N2,O2) system from the results obtained, the following general formula has suggested for the prepared complexes [M+2(2-mbd)(3-pic)2] and octahedral stereochemistry, Where M+2 = (Mn , Co , Ni , Cu , Zn and Cd), 2-mbd = 2,2'-(1E,1'E)-(4,4'-methylene bis (4,1-phenylene ) bis (azan-1-yl-1-ylidene) bis(methan-1- yl-1-ylidene)diphenol (2-mbd), 3-pic = 3-picoline. Key words: Mixed ligand, Schiff bases, metal ions, 3-pic. 103 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 Theoretical Schiff bases represent one of the most widely used families of organic compound and their chemistry is essential material in many organic chemistry text books[1,2] and are well known to have antifungal antitumor and herbicrdal activities[3,4] the complex behavior of Schiff base as ligands, with transition metal is very useful for bio-inorganic chemists, several complexes of palladium were synthesized and used as anti cancer and having biological activities[5,6] Schiff base containing nitrogen and oxygen donor atoms play an important role in biological system and represent interesting models for metaloenzymes as in the complex behavior of Schiff bases with various first series transition metal ions (Cu+2 , Co+2) metal complexes were synthesized and characterized and these complexes have shown good anti bacterial and antifungal activities[7]. We have investigated in this paper, the preparation and properties of some metal ion complexes with Schiff base (2-mbd) and amine adduct (3-picoline). Experimental All reagents used were analar or chemically pure grade by British drug house (BDH), Merck and Fluka. Metal salts (MnCl2.4H2O, CoCl2.6H2O, NiCl2.6H2O, CuCl2.2H2O, ZnCl2 and CdCl2.H2O), 3-Picoline, 2-Hydroxybenzaldehyde, 4,4'-Methylenedianiline, Glacial acetic acid, DMSO, Ethanol. Instruments 1H and 13C-NMR were recorded using ultra shield 300 MHz Switzerland at University of Al-Albyt, Jordan, conductivity measurements were carried out Philips PW digital meters conductivity in DMSO at 10-3 M, FT-IR spectra were recorded as KBr discs in the range (4000-400) cm-1 using Shimadzu FT-IR, UV-Visible spectra were recorded by Shimadzu UV- 8300 vis160A ultraviolet spectrophotometer the range of (200-1000) nm at 10-3 M in DMSO. Metal contents of the complexes were determined by atomic absorption using (Shimadzu at 6806) atomic absorption spectrophotometer, magnetic susceptibility (µeff. B.M) were recorded by faraday method using balance magnetic susceptibility model (MSB-MKT). Melting point was determined by using (Stuart-melting point apparatus). General method for the synthesis of the Schiff base (2-mbd) to solution of 4,4'-methylenedianiline (3grm) (0.015mole) was added (3.67gm) (0.03mole) of 2-hydroxy benzaldehyde, few drops of glacial acetic acid have been added to the reaction mixture, the color of reaction mixture changed immediately to pale yellow. The final mixture reflux for 3hrs, then allowed to cool at room temperature, the precipitated pale yellow powder has been filtered off and recrystallization from ethanol, scheme[1], yield (91%), (M.P =163- 165) ˚C , %C found (79.005) while calculate (79.78), %H found (5.191) while calculate(5.46), %N found (7.063) while calculate(6.89). Synthesis of metal complexes (0.41gm) (1mmole) of Schiff base (2-mbd) was dissolved in 25ml of ethanol containing (0.12gm) (2mmole) of KOH, then the solution of following metal salts MnCl2.4H2O (0.2gm, 1mmole), CoCl2.6H2O (0.24gm,1mmole), NiCl2.6H2O (0.24gm,1mmole), CuCl2.2H2O (0.2 gm,1mmole), ZnCl2 (0.14gm,1mmole) and CdCl2.H2O (0.2gm,1mmole) in ethanol were added dropwise to the solution of the Schiff base (2-mbd), the mixture was stirred for 2 hour at room temperature. Complexes were separated by adding an excess of (3-pic) (2mole, (1-2) 104 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 ml and treating the solution with diethyl ether until is completed precipitation, the precipitate was washed with distilled water and ethanol and dried under vacuum. Results and discussion The isolated complexes were crystalline solids, soluble in some of the common solvents such as dimethyl formamide, dimethyl sulphoxide, they are relatively thermally stable, the conductivity measurements in DMSO indicated the non-electrolyte behavior, Table (1) in clouds the physical properties. The analytical data confirmed the (1:1:2) (metal:Schiff base: 3- pic) composition of the complexes, the magnetic measurements (µeff B.M) for the complexes are also listed in Table (1). Spectral studies 1H and 13C-NMR spectra 1- 1HNMR spectrum for the Schiff bases (2-mbd) in (CDCl3) as solvent Fig. (1) showed the following signals: single peak at (4.03-4.11) ppm for (2H, CH2), doublet doublet peaks at(6.95-7.05) ppm for (8H, aromatic protons), multiples peaks at(7.24-7.41) ppm for (8H, aromatic protons), single peak at (8.61-8.69) ppm for (1H, HC=N), single peak at (13.31) ppm for (1H, OH). 2- The carbon nuclear magnetic resonance spectrum for the Schiff bases was carried out using (CDCl3) as a solvent and the following peaks were detected, Fig. (2): signal at (41.03) ppm for (CH2) signal at(77.50) ppm for (CDCl3), signals at(117.25-146.71) ppm for aromatic carbons, signal at (161.13) ppm for (CH=N), signal at(162.19) ppm for (C-OH). Infrared spectra FT-IR spectrum of the Schiff bases (2-mbd) Fig. (3), showed bands due to υ(OH), υ(C=N) and υ(C-O) respectively which absorbed at (3419) cm-1, (1618) cm-1 and (1270) cm-1[8-11]. The spectrum of free (3-picoline) showed band at (1613) cm-1 was assigned to υ(C=N)[12]. The FT-IR spectra of complexes: a strong sharp absorption band around (1618) cm-1 in spectrum of the Schiff base may be assigned to the υ(C=N) stretching, in spectra complexes, this band is shifted the range between (1600-1612) cm-1[10,11] upon complexation with metal, which may be attributed to the coordination of the imine nitrogen to the metal center[13]. The Schiff base shows band at (3419) cm-1 due to υ(OH) stretching from phenolic group which disappears in the spectra complexes indicating the deprotonation of the Schiff base upon complexation[14]. The strong phenolic (C-O) absorption band at (1270) cm- 1abserved in the spectrum of Schiff bases shifts to higher frequency at range (1281-1369) cm- 1, supporting the coordination of the deprotonated phenolic oxygen atoms to the metal centers in the complexes[14]. The stretching vibration band υ(C=N) appeared in the range (1504- 1566) cm-1 shifted to lower frequencies by (47-109) cm-1 which means that the nitrogen atom of (3-pic) was involved in coordination[15] absorption bands in the (442-525) cm-1 region are considered to be due to metal-nitrogen υ(M-N) vibrations whilst those accruing around (515- 580) cm-1 are through to a wise from metal-oxygen (M-O) vibration[16], Fig. (4) showed the FT-IR spectrum of [Ni(2-mbd)(3-pic)2] and Table (2) describe the important bands and assignment for ligands and its complexes. 105 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 Electronic spectral The absorptions and assignments related to the ligands and their complexes are listed in Table (3), the ligand Fig. (5) exhibited an absorption bands in (UV) region at wave number (37593) cm-1 which may be attributed to (π→π*) transition, other band appeared at (29069) cm-1 was expressed at the (n→π*) free (3-picoline) spectrum showed absorption band at (30769) cm-1 which was expressed as the (n→π*)[17]. Spectra of the complexes [Mn(2-mbd)(3-pic)2] (d5): The spectrum of this complex showed four absorptions at (37593) cm-1, (28985) cm- 1, (13513) cm-1 and (11111) cm-1 which may be attributed to (L.F), (C.T), 6A1g → 4T2g(G) and 6A1g → 4T1g(G) respectively[18,19]. [Co(2-mbd)(3-pic)2] (d7): The spectrum of the this complex, Fig. (6) exhibited bands at (37593) cm-1, (28985) cm-1 (27855) cm-1, (17857) cm-1 and (12345) cm-1 which have been assigned as (L.F), (C.T), 4T1g(F) → 4T1g(P), 4T1g → 4A2g and 4T1g(F) → 4T2g(F)[20] respectively, and the B- found to be at ( 578.46) cm-1 and β = B- / Bo comes out to be (0.595). [Ni(2mbd)(3-pic)2] (d8): The spectrum of this complex exhibited the following absorptions at (37593) cm-1, (29068) cm-1, (16260) cm-1 and (12437) cm-1 which have been assigned as (L.F), 3A2g → 3T1g(P), 3A2g → T1g(F) and 3A2g → 3T2g respectively[21] and the B- found to be at (534.5) cm-1 and β = B- / Bo comes out be at (0.513). [Cu(2-mbd)(3-pic)2] (d9): The spectrum of complex gave two bands at (37593) cm-1 and (28985) cm-1 which may be attributed to (L.F), (C.T) and another band shows at (12658) cm-1 which may be attributed to 2Eg → 2T2g transitions[22,23]. [Zn(2mbd)(3-pic)2] and [Cd(2-mbd)(3-pic)2] (d10): The complexes [Zn(2-mbd)(3-pic)2] and [Cd(2-mbd)(3-pic)2] confirmed the absence of any (d-d) transition[24]. According to spectral data as well as those obtained from elemental analysis, the chemical structure of the complexes may be suggested as oh octahedral Fig. (7) for [M+2(2-mbd)(3- pic)2] where M+2 = (Mn, Co, Ni, Cu, Zn and Cd) 2,2'-(1E,1'E)-(4,4'-methylenebis(4,1-phenylene)bis(azan-1-yl-1-ylidene))bis(methan-1-yl-1- ylidene)diphenol 2-mbd = (3-pic) = 3-picoline Conclusions Some metal ions (Mn+2, Co+2, Ni+2, Cu+2, Zn+2 and Cd+2) complexes of Schiff base ( 2- mbd) and 3-picoline have been synthesized and characterized on the basis of their (1H and 13C-NMR, FT-IR, UV-Vis) spectroscopy. The complexes showed octahedral geometry around the metal. References 1- Smith, M.B. and March, J., (2007) “Marche Advanced Organic Chemistry: Reactions, Mechanisms and Structure”, 6th Ed., John Wiley and Sons, Inc., Hoboken, New Jersey. 2- Carey, F. A., (2003) “Organic Chemistry”, 5th Ed., The Mc-Graw-Hill Companies, Inc., New York. 3- Mitu, L.; Ilis, M.; Roman, N.; Imran, M. and Ravichandran, S. (2012) “Transition metal complexes of isonicotinoylhydraone-4-diphenylaminobenzaldehyde:synthesis, characterization and antimicrobial studies”, E. J. Chem., 9: 365-372. 4- Pandeya, S.N.; Sriram, D.; Nath, G. and Dc elercq, E. (1999) “Synthesis and pharmacological evaluation of some novel isatin derivatives for antimicrobial activity”, II Farmaco., 54: 624-628. 106 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 5- Kalyani, P.; Adharvanachary, M. and Kinthada, P.M.M.S. (2012) “Synthesis, characterization and nuclease activity of some novel palladium(II)- complexes of benzylthiosemicarbazone (BTSC) and substituted thiosemicarbazones”, Int. J. Pharmbiomed. 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(2004) “Synthesis, crystal structures, and antibacterial activities of four Schiff base complexes of copper and zinc”, Zeitschrift fur Anorganische und Allgemeine chemie, 630(115): 2754-2760. 11- Mourya, R.C.; Varma, R. and Shukla, P. (1997) “Synthesis of nitrato complexes of lanthanum(III) with Schiff bases derived from 4-antipyrinecarboxaldehyde and aromatic amines”, Journals of the Indian Chemical Society, 74(9): 789-790. 12- Greenwood, N.N. and Wade, K. (1960) “Complexes of boron trichloride with pyridine and piperidine”, J. Chem. Soc., 4: 1130-1141. 13- Singh, L.J. and Singh, R.H. (2013) “Synthesis and characterization of heteronuclear copper(II)-lanthanide(III) complexes of N,N′-1,3-propylenebis(salicylaldiminato) where lanthanide(III) = Gd or Eu”, International Journal of Inorganic chemistry, Article ID 281270, 9 pages. 14- El-Anasary, A.I. and Abdel-Kadara, N.S. (2012) “Synthesis, characterization of La(III), Nd(III) and Er(III) complexes with Schiff bases derived from benzopyran-4-one and their fluorescence study”, International Journal of Inorganic chemistry, Article ID 901415, 1-13. 15- Sarhan, B.M., Waheed, E.T. and Naema, B.Z. (2011)“ Synthesis and characterization of some mixed-ligand complexes contining N-acetyl tryptophane and α-picoline with some metal salts”, Ibn Al-hatham Journal for Pure & Apllied Science, 24(1): 144-154. 16- Nakamoto, K., (1996), “Infrared spectra of inorganic and coordination compounds”, 4th Ed. , John wily and Sons, New York. 17- Nichllis, D. (1979) “Complexes and first-row transition element”, Macmilolan Chemistry, Text, 6(4): 73-79. 18- Heidt, L.F.; Kostes, G.F. and Johanson, A.M. (1958) “Absorption spectrum of manganese(II) diethylenetriamine complexes”, J. Am. Chem. Soc., 80, 6471. 19- Jorgensen, C.K (1963) “Synthesis, characterization and antibacterial activity of Mn(II), Co(II), Ni(II) and Cu(II) complexes of 4-carboxaldehyde (phenyl hydrazine 1-phenyl -3- metyl-2-pyrazoline-5-one”, Chem. Phys., 5: 33. 20- Al-Jibouri, M.N. (2008) “Synthesis and structural studies of oxo-vanadinm(IV), chromium(III), manganese (II), iron(II), cobalt(II), nickel(II) and copper(II) complexes with a new tetradentate Schiff base having O:N:O:N: donor system”, Journal of AL-Nahrain University, 11(2): 10-15. 21- Mittal, P.; Joshi, S.; Panwar, V. and Uma, V. (2009) “Biologically active Co(II), Ni(II), Cu(II) and Mn(II) complexes of Schiff bases derived from vinyl aniline and heterocyclic aldehydes”, International Journal of Chem. Tech. Research, 1(2): 225-232. 22- Abed, A.G. (2014) “U.V spectroscopic studies of the Schiff base N-(O-N( methyl-3-ol-2- butenimino)-N′-(O-toluyl)-1,2-diphenylethandimine and its complexes with Co(II), Ni(II), Cu(II) and Pd(II): direct determination in absolute ethanol”, Raf. J. Sci., 25(2): 32-43. 107 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 23- Usharani, M.; Alkila, E.; Jayaseelan, P. and Rajarel, R. (2013) “Structural elucidation of newly synthesized potentially active binuclear Schiff base Cu(II), Ni(II), Co(II) and Mn(II) complexes using physicochemical methods”, International Journal of Scientific & Engineering Research, 4(7): 1055. 24- Al-Karkhi, I.H.T.; Yaseen, A. K. and Shamkhy, E.T. (2014) “Synthesis, characterization bioactivity and cytotoxicity of NS Schiff base and its Ni(II), Cd(II) and Zn(II) metal complexes”, J . Thi- Qar. Sci., 4(2): 52. Table (1): Physical properties of ligand and its complexes (B.M) effµ Molar conductivity ) 1-mole2 .cm1-(Oh in DMSO M % Calculate (Found) M.P ˚C Color Complexes - 2.8 - 163-165 ˚C Yellow Schiff base (2-mbd) 5.72 5.20 8.50 (7.93 ) 210-212 ˚C Brown ]2pic)-d)(3mb-Mn(2[ 4.35 5.78 9.07 (8.74) 290-292 ˚C Deep- violet ]2pic)-d)(3mb-Co(2[ 3.26 7.50 9.03 (8.69) 260-262 ˚C Deep- green ]2pic)-d)(3mb-Ni(2[ 1.72 4.45 9.71 (9.13) 201-203 ˚C deep- brown ]2pic)-d)(3mb-Cu(2[ - 9.83 9.96 (8.95) 312-314 ˚C Yellow ]2pic)-d)(3mb-Zn(2[ - 7.18 15.98 (15.23) 310-312 ˚C Yellow ]2pic)-d)(3mb-Cd(2[ Table (2): The characteristic infrared of the ligands (2-mbd), (3-pico) and their metal complexes (M-O) (M-N) (C-O) Phenolic (OH) (C=N) Ligand (C=N) (3-pico) Complexes - - )S(1270 )m(3419)S(1618- Schiff base (2-mbd) - - - - )S(1613 3-pico )w(550 )w(525 )W(470 )s(1281 - )m(1600 )m(1566 ]2pic)-d)(3mb-Mn(2[ )w(519 )W(457 )W(432 )s(1311 - )s(1606 )S(1523 ]2pic)-d)(3mb-Co(2[ )m(580 )m(515 )W(462 )s(1311 - )S(1606 )s(1504 ]2pic)-d)(3mb-Ni(2[ )m(519 )w(447 )W(465 )s(1369 - )s(1610 )S(1504 ]2pic)-d)(3mb-Cu(2[ )m(519 )m(451 )W(463 )s(1321 - )s(1612 )S(1529 ]2pic)-d)(3mb-Zn(2[ )m(519 )w(448 )W(442 )m(1317 - )s(1606 )m(1504 ]2pic)-d)(3mb-Cd(2[ Where: s = strong , m = medium , w = weak 108 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 Table (3): Electronic spectra data of ligands and its complexes Assignment maxЄ 1-.cm1 -L.mol 1-Wav number cm (nm)maxλ Compound *π→π *n→π 921 2254 37593 29069 266 344 Schiff base (2-mbd) *n→π 600 30769 325 3-pic (ligand) L.F C.T 2g(G)T4→ 1gA6 1g(G)T4→ 1gA6 863 2108 16 15 37593 28985 13513 11111 266 345 740 900 ]2pic)-d)(3mb-Mn(2[ L.F C.T 1g(P)T4 → 1gT4 2gA4 → 1gT4 2gT4 → 1gT4 922 1754 198 50 15 37593 28985 27855 17857 12345 266 345 359 560 810 ]2pic)-d)(3mb-Co(2[ L.F 1g(P)T3 → 2gA3 Mix (d with) C.T 1g(F)T3 →2gA3 2g(F)T3 →2gA3 830 1994 15 10 37593 29069 16260 12437 266 344 615 804 ]2pic)-d)(3mb-Ni(2[ L.F C.T 2gT2 → gE2 906 1754 60 37593 28985 12658 266 345 790 ]2pic)-d)(3mb-Cu(2[ L.F L.F C.T 1034 1890 2124 37593 30303 24570 266 330 407 ]2pic)-d)(3mb-Zn(2[ L.F C.T 723 1580 37593 28985 266 345 ]2pic)-bd) (3m-Cd(2[ mbd)-NMR spectrum of ligand Schiff base (2-H1( 1 ): The ureFig 109 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 mbd)-NMR spectrum of ligand Schiff base (2-C13(2): The ureFig Figure (3): FT-IR spectrum of ligand Schiff base (2-mbd) 110 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 ]2pic)-mbd)(3-IR spectrum of [Ni(2-(4): FT ureFig Figure (5): UV-vis spectrum of ligand (Schiff base 2-mbd) 111 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 ]2pic)-mbd)(3-vis spectrum of complex [Co((2-(6): UV ureFig H2 C N N O O N CH3 N M H3C M+2 = Mn , Co , Ni , Cu , Zn , Cd [M(2-mbd)(3-pic)2] Figure (7): The proposed structural formula of the complexes H2 C N N OH HO O HO 2+ NH2H2N ref lux 2h 4,4'-methylenedianiline 2-hydroxybenzaldehyde 2,2'-(1E, 1'E)-(4,4'-methylenebis(4,1-phenylene)bis(aza n-1-yl-1-ylidene ))bis(m ethan-1-yl-1- ylide ne)diphenol Scheme (1): Preparation of [Schiff base (2-mbd)] 112 | Chemistry 2016) عام 1(العدد 29لمجلد ا مجلة إبن الهيثم للعلوم الصرفة و التطبيقية Ibn Al-Haitham Jour. for Pure & Appl. Sci. Vol. 29 (1) 2016 تحضير وتشخيص بعض المعقدات الفلزية مع ليكاندات مختلطة من قاعدة شف و بيكولين) -3( سرحان محسن باسمة بغداد جامعة / )الهيثم ابن (الصرفة للعلوم التربية كلية / الكيمياء قسم مظهر يونس محمد ثائر محمد سلمان تكريت جامعة للبنات / التربية كلية / الكيمياء قسم 2015حزيران//30قبل في: ،2015أيار//26في:استلم الخالصة يتضمن البحث تحضير وتشخيص بعض المعقدات الفلزية التي تحتوي على ليكاندات مختلطة حاوية على قاعدة شف وقد كليكاند ثانوي بيكولين -٣كليكاند اولي و انيلينثنائي مثيلين -'٤،٤سالسالديهايد و هايدروكسي -2المشتقة من ( واالشعة فوق )NMR-C13 and H1( ودرست بالطرائق الطيفية وهي طيف الرنين النووي المغناطيسي شخصت تحت الحمراء، وقياس نسبة الفلز بواسطة طيف االمتصاص الذري فضال عن قياس التوصيلية المرئية واالشعة-البنفسجية تشخيصية اقترح الشكل الثماني السطوح لهذه المعقدات مع ومن نتائج هذه الدراسات ال الموالرية والحساسية المغناطيسية ي:أتإعطاء الصيغة العامة لهذه المعقدات وكما ي [M(2-mbd)(3-pic)2] 2M =Cd , Zn , Cu , Ni , Co , Mn+ ذإ 2,2'-(1E,1'E)-(4,4'-methylenebis(4,1-phenylene)bis(azan-1-yl-1-ylidene))bis(methan-1-yl-1- ylidene)diphenol 2-mbd = بيكولين) -٣( = (pic-3)و اثبتت النتائج ان قاعدة شف تسلك كليكاند رباعي السن اذ يرتبط عن طريق ذرتي االوكسجين ضمن مجموعة الفينول ذإ كليكاند احادي السن اذ يرتبط عن طريق ذرة النتروجين في حلقة بيكولين -٣وذرتي النتروجين ضمن الحلقة بينما يسلك .البيريدين المعقدات الفلزية . ،بيكولين -٣ ،قاعدة شف ،ليكاندات مختلطة الكلمات المفتاحية: