Bimetallic dioxidovanadium(V) complex containing a malonohydrazide derivative ligand: Synthesis, characterization, and crystal structure European Journal of Chemistry 13 (4) (2022) 387-392 European Journal of Chemistry ISSN 2153-2249 (Print) / ISSN 2153-2257 (Online) – Copyright © 2022 The Authors – Atlanta Publishing House LLC – Printed in the USA. This work is published and licensed by Atlanta Publishing House LLC – CC BY NC – Some Rights Reserved. https://dx.doi.org/10.5155/eurjchem.13.4.387-392.2302 European Journal of Chemistry View Journal Online View Article Online Bimetallic dioxidovanadium(V) complex containing a malonohydrazide derivative ligand: Synthesis, characterization, and crystal structure Sunshine Dominic Kurbah Department of Chemistry, Pandit Deendayal Upadhyaya Adarsha Mahavidyalaya, Eraligool-788723, Karimganj, Assam, India * Corresponding author at: Department of Chemistry, Pandit Deendayal Upadhyaya Adarsha Mahavidyalaya, Eraligool-788723, Karimganj, Assam, India. e-mail: sunshinekurbah@yahoo.com (S.D. Kurbah). 10.5155/eurjchem.13.4.387-392.2302 Received: 07 July 2022 Received in revised form: 03 September 2022 Accepted: 09 September 2022 Published online: 31 December 2022 Printed: 31 December 2022 In this paper, we report the synthesis and characterization of the dioxidovanadium(V) complex derived from a malonohydrazide ligand (N'1,N'3-bis(2-hydroxybenzylidene) malonohydrazide). The newly synthesized complex was characterized by infrared spectroscopy (IR), nuclear magnetic resonance (NMR), and the structure of the complex was also established by a single crystal X-ray diffraction study. The bimetallic complex crystallizes in the triclinic space group P-1 with the following parameters a = 10.8273(5) Å, b = 11.4677(6) Å, c = 15.0366(8) Å, α = 81.591(4)°, β = 83.018(4)°, γ = 76.326(4)°, V = 1787.23(16) Å3, Z = 2, T = 292.5(2) K, μ(MoKα) = 0.600 mm-1, Dcalc = 1.463 g/cm3, 11730 reflections measured (6.236° ≤ 2Θ ≤ 58.062°), 7981 unique (Rint = 0.0231, Rsigma = 0.0506) which were used in all calculations. The final R1 was 0.0496 (I > 2σ(I)) and wR2 was 0.1255 (all data). The ligand was coordinated to the metal ions in a tridentate fashion through the donor O/N/O atoms. The metal ions adopted a square pyramidal geometry with slight distortion. Reaction of the complex with hydrogen peroxide was also carried out, and it was found that the complex reacts with hydrogen peroxide to form a peroxo complex. Bimetallic Reactivity Hydrazone Crystal structure Dioxidovanadium(V) Square pyramidal geometry Cite this: Eur. J. Chem. 2022, 13(4), 387-392 Journal website: www.eurjchem.com 1. Introduction Vanadium is a biologically relevant metal and is present in several naturally occurring compounds such as amavadin is found in Amanitae mushrooms [1], blood cells of sea-squirts (Ascidiceae) and farm worms [2]. The coordination chemistry of vanadium deals with a large number of oxidation states that range from -3 to +5. The +4 and +5 oxidation states are the most common oxidation states under aerobic conditions [3-8]. The large part of vanadium coordination chemistry in solution originates in +4 and +5 oxidation states from N/O donor ligand complex formation [9-11]. The coordination chemistry of oxovanadium(IV) and (V) species with polyfunctional ligands has acquired renewed interest with the discovery and characterization of vanadate dependent haloperoxidases [12- 15]. The further work in vanadium coordination chemistry stems from therapeutic applications of vanadium compounds. This is in particular due to their use in the treatment of diabetes mellitus in humans [16-18]. Vanadium compounds also have the potential to inhibit phosphoryl transfer enzymes and their catalytic potential in organic transformation [19-23]. Vanadium compounds have a wide variety of applications, including as magnetic materials [24,25], as catalysts [26,27], and as cathode materials [28]. Therefore, our objective is to synthesize and characterize a new vanadium(V) complex derived from a malonohydrazide derivative that mimics the haloperoxidases enzyme activity and helps to understand its key structural and electronic features. 2. Experimental 2.1. Materials and instrumentation The solvents were reagent grade and were used as received. Other chemicals were E-Merck, Himedia, or equivalent grades, and all solvents were used as received. All operations were performed under aerobic conditions. Infrared spectra in the range 4000-200 cm-1 were recorded as KBr discs using a BX- III/FT-IR Perkin Elmer spectrophotometer. The 1H NMR and 13C NMR spectra were recorded on Bruker Avance II 400 and 100 MHz, respectively, in DMSO-d6 solution using TMS as internal standard. Electronic spectra were recorded on a Perkin Elmer Lambda-25 spectrophotometer. 2.2. Single-crystal X-ray diffraction study Single crystal X-ray diffraction data was collected using Xcalibur, EOS, Gemini diffractometer equipped with a mono- chromated MoKα radiation (λ = 0.71073 Å). ABSTRACT RESEARCH ARTICLE KEYWORDS https://dx.doi.org/10.5155/eurjchem.13.4.387-392.2302 https://www.eurjchem.com/ https://dx.doi.org/10.5155/eurjchem.13.4.387-392.2302 mailto:sunshinekurbah@yahoo.com http://www.eurjchem.com/ https://crossmark.crossref.org/dialog/?doi=10.5155/eurjchem.13.4.387-392.2302&domain=pdf&date_stamp=2022-12-31 388 Sunshine Dominic Kurbah / European Journal of Chemistry 13 (4) (2022) 387-392 2022 – European Journal of Chemistry – CC BY NC – DOI: 10.5155/eurjchem.13.4.387-392.2302 OH HO N H N O H N O N OH O H2N H N O H N O NH2+ Methanol Scheme 1. Synthesis of N'1,N'3-bis(2-hydroxybenzylidene)malonohydrazide. Scheme 2. Synthesis of bis(dioxidovanadate(V)) complex. The crystal structure was solved by SHELXT and refined by SHELXL-2014 [29,30]. All non-hydrogen atoms were refined anisotropically, whereas the hydrogen atoms were place at a calculated position and refined in the final refinement. 2.3. Preparation of N'1,N'3-bis(2-hydroxybenzylidene) malonohydrazide ligand (H4SLMH) To an aqueous methanol solution of malonoyldihydrazine (0.66 g, 1 mmol), 2-hydroxybenzaldehyde (1.72 g, 1 mmol) was added and the reaction mixture stirred for approximately half an hour at 40 °C (Scheme 1). The white precipitate obtained was filtered and washed with hot methanol and dried over anhydrous CaCl2. N'1,N'3-bis(2-Hydroxybenzylidene)malonohydrazide (H4SLMH): Colour: White. Yield: 96%. FT-IR (KBr, ν, cm-1): 3279, 3188, 3063, 2967, 2905, 2870, 1667, 1610, 1569, 1487, 1391, 1359. 1H NMR (400 MHz, DMSO-d6, δ, ppm): 11.85 (s, 1H, NH), 11.49 (s, 1H, NH), 11.07 (s, 1H, OH), 11.05 (s, 1H, OH), 8.41 (s, 1H, CH=N), 8.27 (s, 1H, CH=N), 7.65-6.70 (m, 8H, Ar-H), 3.90 (s, 1H, CH2), 3.60 (s, 1H, CH2). 13C NMR (100 MHz, DMSO-d6, δ, ppm): 162.39 (C=O), 157.26 (Ar-C-OH), 147.10 (C=N), 131.27 (Ar-C), 129.23 (Ar-C), 119.30 (Ar-C), 118.60 (AR-C=C), 116.28 (Ar-C), 41.60 (CH2). 2.4. Synthesis of complex N'1,N'3-bis(2-Hydroxybenzylidene)malonohydrazide (1.00 g, 2.94 mmol) was dissolved in 30 mL of methanol and stirred at 70 °C. To this solution, vanadium pentoxide (V2O5) (1.06 g, 5.83 mmol) in 30 mL methanol and lithium carbonate (Li2CO3) (0.65 g, 8.82 mmol) in 20 mL methanol were added slowly accompanied by gentle stirring for 15 minutes (Scheme 2). The brown color solution was then refluxed for 1 h, filtered, washed three times with hot methanol (20 mL each time), and dried over anhydrous CaCl2. Colour: Light brown. Yield: 93%. FT-IR (KBr, ν, cm-1): 3433, 1647, 1611, 1558, 1446, 1363, 1280, 933, 896, 753. 1H NMR (400 MHz, DMSO-d6, δ, ppm): 8.78 (s, 2H, C(H)=N), 7.93 (s, 1H, Ar-H), 7.49 (t, 2H, Ar-H), 7.30 (t, 2H, Ar-H), 6.75 (dd, 3H, Ar-H), 3.26 (s, 2H, CH2). 13C NMR (100 MHz, DMSO- d6, δ, ppm): 172.12 (C=N), 164.37 (C=N), 162.36 (C=O), 154.77 (C-O), 132.91, 132.42 (Ar-C), 119.68 (Ar-C=C), 116.62 (Ar-C), 39.93, 39.09 (-CH2). 3. Results and discussion 3.1. Synthesis The complex has been synthesized from the reaction of N'1,N'3-bis(2-hydroxybenzylidene)malonohydrazide with vana- dium pentoxide (V2O5) and Li2CO3 in 1:1:3 molar ratio in methanol under refluxing conditions for one hour. The isolated complex has been found to have the composition [Li(H2O)4]2 [(VO2)2(SLMH)] based on data obtained from analytical and crystallographic studies. The complex is yellow in color and air stable. The complex is insoluble in common organic solvents such as dichloromethane, chloroform, benzene, hexane, and ether; slightly soluble in water, methanol, acetonitrile and acetone but completely soluble in highly coordinating solvents such as DMSO and DMF. Some structurally significant IR bands for the uncoor- dinated ligand and vanadium(V) complex, which are useful in determining the mode of coordination of the ligand. The IR spectra of the uncoordinated ligand show very strong bands at 3279 and 3188 cm-1, which are attributed to the joint contri- butions from stretching vibrations of the secondary NH and OH groups. A couple of strong bands are observed at 1667 and 1610 cm-1 in the uncoordinated ligands. These bands owe their origin to >C=O groups. When the IR spectra of the complex are compared with those of the uncoordinated ligand in the region below the 1000 cm-1, new weak to medium to strong bands have been observed in the 628-603 and 546-490 cm-1 regions, respectively. As these bands are not observed in the IR spectra of the ligands, they are attributed to the vibrations of rocking and wagging of water molecules bonded to the metal centers, respectively [31]. In addition to the ligand bands, the complex displayed a strong band, appearing in the region of 933 and 896 cm-1, these bands were assigned to the V=O terminal stretching frequencies which are typical of the cis-VO2 core, as noted previously by other workers for similar complexes [31]. The ligand H4SLMH shows four signals at δ 11.85, 11.49, 11.07, and 11.05 ppm due to OH and NH protons. The absence of signals at δ 11.07 and δ 11.05 ppm in the complex, suggests that bonding of phenolate/naphtholate oxygen atom to metal center via deprotonation of OH group. Similarly, the non- observance of any signal at δ 11.85 and 11.49 ppm due to secondary NH protons indicates involvement of carbonyl oxygen atom in enol form in bonding to metal centers [32]. The aromatic protons for the ligand and complex appear in the expected region. Another important feature of 1H NMR spectra of the complex is the upfield shift shown by methylene protons which appear at δ 3.26 ppm as compared to their position at δ 3.90 and 3.60 ppm in free ligand. The complex has fairly highly solubility in DMF solution, hence their electronic spectrum was recorded in this solvent. The ligand shows absorption bands at 296 and 328 nm, whereas the complex shows absorption bands at 305 nm (30240 dm3/mol.cm), 424 (20400 dm3/mol.cm) nm. Such a large shift of ligand bands on complexation indicates a strong bonding between phenolate oxygen atoms and vanadium metal centers. This may be attributed to the complexation effect of the ligand. The complex do not show any band in the visible region of electronic spectra as the metal center being present in +5 oxidation state does not contain any electron in its 3d orbital [32]. Sunshine Dominic Kurbah / European Journal of Chemistry 13 (4) (2022) 387-392 389 2022 – European Journal of Chemistry – CC BY NC – DOI: 10.5155/eurjchem.13.4.387-392.2302 Table 1. Crystal data and structure refinement for bis(dioxidovanadate(V)) complex. Empirical formula C23H39Li2N6O17V2 Formula weight 787.36 Temperature (K) 292.5(2) Crystal system Triclinic Space group P-1 a, (Å) 10.8273(5) b, (Å) 11.4677(6) c, (Å) 15.0366(8) α (°) 81.591(4) β (°) 83.018(4) γ (°) 76.326(4) Volume (Å3) 1787.23(16) Z 2 ρcalc (g/cm3) 1.463 μ (mm-1) 0.600 F(000) 814.0 Crystal size (mm3) 0.19 × 0.16 × 0.08 Radiation MoKα (λ = 0.71073) 2Θ range for data collection (°) 6.236 to 58.062 Index ranges -13 ≤ h ≤ 12, -15 ≤ k ≤ 9, -18 ≤ l ≤ 20 Reflections collected 11730 Independent reflections 7981 [Rint = 0.0231, Rsigma = 0.0506] Data/restraints/parameters 7981/0/481 Goodness-of-fit on F2 1.038 Final R indexes [I≥2σ (I)] R1 = 0.0496, wR2 = 0.1151 Final R indexes [all data] R1 = 0.0682, wR2 = 0.1255 Largest diff. peak/hole (e.Å-3) 0.63/-0.51 Figure 1. Molecular structure of bis(dioxidovanadate(V)) complex. 3.2. Molecular structure of the complex The ORTEP plot of the crystal of the complex is shown in Figure 1 and the crystal packing diagram is given in Figure 2. The complex crystallizes in triclinic form with the space group P-1. Crystal and structure refinement data are given in Table 1. The bond lengths and bond angles are given in Tables 2 and 3. The complex is composed of one ligand, two vanadium atoms, together with lithium atom bonded to different water molecules, and DMF molecules in the crystal lattice. The ligand bonded to two vanadium atoms in a tridentate fashion; as a result, the protonation likely occurred at the oxygen atoms of the ligand. The coordination modes of the ligand to metal ions are shown in Figure 1. The basal position around V1 is composed of O1, N1, and O2 whereas the terminal position is composed of O3 and O4 and the basal position around V2 is composed of O5, O6 and N4 whereas the terminal position is composed of O7 and O8, respectively. The vanadium-nitrogen bond distances in the complex are 2.154(2) Å for V1-N1 and 2.132(2) Å for V2-N4, whereas the vanadium-oxygen bond distances around V1 are 1.9042(18) Å (V1-O1), 1.9757(18) Å (V1-O2), 1.6306(18) Å (V1-O3) and 1.6125(18) Å for V1-O4. The angles around V1 are 148.87(8)° for O1-V1-O2 and 142.18(9)° for O3-V1-N1. The distance of the vanadium-oxygen bond around V2 is 1.9154(18) Å (V2-O6), 1.9761(18) Å (V2-O5), 1.599(2) Å (V2-O7), and 1.642(2) Å (V2-O8), with their angles 145.19(8)° for O6-V2-O5 and 144.92(10)° for O8-V2-N4. The geometrical index around V1 and V2 are τ1 = 0.11, τ2 = 0, respectively. Hence, the geometry around V1 can be described as a square pyramidal geometry with slight distortion whereas around V2 a perfectly square pyramidal geometry with no distortion was observed. 3.3. Reaction of the complex with hydrogen peroxide When an aqueous solution of 30% H2O2 is added to a methanolic solution of the bimetallic bis(dioxidovanadate(V)) complex, the formation of the bimetallic bis(monooxidomono peroxidovanadate(V)) complex occurs [33]. We could isolate the bis(monooxoperoxidovanadate(V) complex by performing the reaction between the prepared complex and 30% H2O2 in a 1:5 molar ratio in methanol at 0 °C (Scheme 3). We have been able to establish its formation by iodometric titration. The experimentally determined value of peroxide was 5.0 and 4.5% in peroxo compound of complex and calculated on the basis of formation bis(monooxidomonoperoxidovanadate(V) complex. This indicated that the instability in the solid state [33]. However, the complex might be stable in the solution state. Furthermore, the formation of the complex was established by absorption spectroscopy (Figure 3). The IR spectra of the complex show very strong bands at 933 and 866 cm-1. These bands most probably masks band due to cis-VoO22+ group which also appears almost at the same position [28]. 390 Sunshine Dominic Kurbah / European Journal of Chemistry 13 (4) (2022) 387-392 2022 – European Journal of Chemistry – CC BY NC – DOI: 10.5155/eurjchem.13.4.387-392.2302 Table 2. Bond lengths for bis(dioxidovanadate(V)) complex. Atom Atom Length (Å) Atom Atom Length (Å) V1 O1 1.9042(18) O9 C20 1.234(4) V1 O2 1.9757(18) C8 C9 1.503(3) V1 O3 1.6306(18) C12 C11 1.438(3) V1 O4 1.6125(18) C12 C13 1.404(4) V1 N1 2.154(2) C12 C17 1.400(4) V2 O6 1.9154(18) C6 C7 1.424(4) V2 O5 1.9761(18) C6 C1 1.410(4) V2 N4 2.132(2) C6 C5 1.406(4) V2 O7 1.599(2) O12 Li2 1.928(6) V2 O8 1.642(2) N5 C20 1.301(4) O1 C1 1.328(3) N5 C18 1.451(4) O2 C8 1.295(3) N5 C19 1.447(4) O11 Li1 1.929(5) C13 C14 1.396(4) O6 C13 1.336(3) N6 C23 1.313(4) O5 C10 1.289(3) N6 C21 1.439(5) N4 N3 1.395(3) N6 C22 1.432(5) N4 C11 1.284(3) C1 C2 1.394(4) O16 Li21 1.925(5) C14 C15 1.369(4) N2 N1 1.402(3) C5 C4 1.366(4) N2 C8 1.294(3) C17 C16 1.376(4) N3 C10 1.286(3) C4 C3 1.376(5) N1 C7 1.293(3) C2 C3 1.381(4) O13 Li12 1.917(5) C15 C16 1.382(5) O14 Li13 1.934(5) Li1 O136 1.917(5) O17 Li24 1.971(6) Li1 O143 1.934(5) O15 Li25 1.929(6) Li2 O167 1.925(5) O10 C23 1.210(4) Li2 O174 1.971(6) O10 Li1 1.923(5) Li2 O155 1.929(6) C10 C9 1.501(3) 1 +x, 1+y, +z; 2 -1+x, +y,+z; 3 1-x, 1-y, -z; 4 -x, 1-y, 1-z; 5 1-x, 1-y, 1-z; 6 1+x, +y ,+z; 7 +x, -1+y, +z. Table 3. Bond angles for bis(dioxidovanadate(V)) complex. Atom Atom Atom Angle (°) Atom Atom Atom Angle (°) O1 V1 O2 148.87(8) C17 C12 C13 119.5(2) O1 V1 N1 82.01(8) C1 C6 C7 122.1(2) O2 V1 N1 73.14(7) C5 C6 C7 118.8(3) O3 V1 O1 95.72(9) C5 C6 C1 119.0(2) O3 V1 O2 92.74(9) N4 C11 C12 123.7(2) O3 V1 N1 142.18(9) C20 N5 C18 120.8(3) O4 V1 O1 103.77(9) C20 N5 C19 120.8(3) O4 V1 O2 101.49(9) C19 N5 C18 118.5(3) O4 V1 O3 109.44(11) O6 C13 C12 122.3(2) O4 V1 N1 107.73(9) O6 C13 C14 119.3(2) O6 V2 O5 145.19(8) C14 C13 C12 118.3(2) O6 V2 N4 82.41(8) C23 N6 C21 122.0(3) O5 V2 N4 73.29(8) C23 N6 C22 120.7(3) O7 V2 O6 105.43(10) C22 N6 C21 117.3(3) O7 V2 O5 104.49(10) N1 C7 C6 123.7(2) O7 V2 N4 104.31(10) O1 C1 C6 121.9(2) O7 V2 O8 109.50(12) O1 C1 C2 119.1(2) O8 V2 O6 97.14(9) C2 C1 C6 118.9(2) O8 V2 O5 89.25(9) C10 C9 C8 112.2(2) O8 V2 N4 144.92(10) C15 C14 C13 120.8(3) C1 O1 V1 134.79(16) C4 C5 C6 121.1(3) C8 O2 V1 118.68(16) C16 C17 C12 121.2(3) C13 O6 V2 131.93(16) C5 C4 C3 119.6(3) C10 O5 V2 118.64(16) C3 C2 C1 120.2(3) N3 N4 V2 115.46(15) C14 C15 C16 121.5(3) C11 N4 V2 128.39(17) C17 C16 C15 118.6(3) C11 N4 N3 116.0(2) O9 C20 N5 126.0(3) C8 N2 N1 108.1(2) C4 C3 C2 121.2(3) C10 N3 N4 109.2(2) O10 C23 N6 125.4(3) N2 N1 V1 115.79(15) O11 Li1 O141 117.6(3) C7 N1 V1 128.93(17) O132 Li1 O11 109.9(2) C7 N1 N2 115.2(2) O132 Li1 O141 106.0(3) C23 O10 Li1 132.3(3) O132 Li1 O10 112.9(3) O5 C10 C9 118.0(2) O10 Li1 O11 105.6(3) N3 C10 O5 122.9(2) O10 Li1 O141 105.0(2) N3 C10 C9 119.1(2) O163 Li2 O174 103.2(3) O2 C8 C9 118.1(2) O163 Li2 O155 119.4(3) N2 C8 O2 123.8(2) O163 Li2 O12 101.2(3) N2 C8 C9 118.2(2) O155 Li2 O174 115.1(3) C13 C12 C11 121.7(2) O12 Li2 O174 114.1(3) C17 C12 C11 118.7(2) O12 Li2 O155 103.3(3) 1 1-x, 1-y, -z; 2 1+x, +y, +z; 3 +x, -1+y, +z; 4 -x, 1-y, 1-z; 5 1-x, 1-y, 1-z. Sunshine Dominic Kurbah / European Journal of Chemistry 13 (4) (2022) 387-392 391 2022 – European Journal of Chemistry – CC BY NC – DOI: 10.5155/eurjchem.13.4.387-392.2302 Figure 2. Packing diagram of the bis(dioxidovanadate(V)) complex along the crystallographic a axis. Figure 3. Electronic spectrum of complex titration with 30% H2O2 (0-2 minutes). O O N N O N O N V V O O O O H2O2 O O N N O N O N V V O O O OOO Scheme 3. Schematic diagram showing the reaction of complex with hydrogen peroxide. 4. Conclusion We have successfully synthesized and characterized bimetallic dioxidovanadium(V) complex derived from from N'1,N'3-bis(2-hydroxybenzylidene)malonohydrazide. The ligand coordinated to the vanadium ions in tridentates fashion through -ONO- donor’s atoms. The ligand is present in enol form in the complex and therefore the ligand coordinates with the vanadium center through phenolate oxygen, enolate oxygen, and azomethine nitrogen atoms. The metal ions adopted a square pyramidal geometry with slight distortion. Acknowledgements Sunshine Dominic Kurbah would like to thank Head of Sophisticated Analytical Instrument Facility, North-Eastern Hill University, Shillong- 793022, India for providing NMR spectra and XRD data. Supporting information CCDC-2189533 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/ data_request/cif, or by e-mailing data_request@ccdc.cam.ac.uk, or by contacting The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, UK; fax: +44(0)1223-336033. Disclosure statement Conflict of interest: The authors declare that they have no conflict of interest. Ethical approval: All ethical guidelines have been adhered. Sample availability: Sample of the compound is available from the author. ORCID and Email sunshinekurbah@yahoo.com https://orcid.org/0000-0001-5029-3815 References [1]. Berry, R. E.; Armstrong, E. 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New J Chem 2020, 44, 5410–5418. [33]. Clark, R.; Brown, D. Chemistry of vanadium, niobium and tantalum; Pergamon Press: London, England, 1975. Copyright © 2022 by Authors. This work is published and licensed by Atlanta Publishing House LLC, Atlanta, GA, USA. The full terms of this license are available at http://www.eurjchem.com/index.php/eurjchem/pages/view/terms and incorporate the Creative Commons Attribution-Non Commercial (CC BY NC) (International, v4.0) License (http://creativecommons.org/licenses/by-nc/4.0). By accessing the work, you hereby accept the Terms. This is an open access article distributed under the terms and conditions of the CC BY NC License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited without any further permission from Atlanta Publishing House LLC (European Journal of Chemistry). No use, distribution or reproduction is permitted which does not comply with these terms. Permissions for commercial use of this work beyond the scope of the License (http://www.eurjchem.com/index.php/eurjchem/pages/view/terms) are administered by Atlanta Publishing House LLC (European Journal of Chemistry). http://www.eurjchem.com/index.php/eurjchem/pages/view/terms http://creativecommons.org/licenses/by-nc/4.0 http://www.eurjchem.com/index.php/eurjchem/pages/view/terms 1. Introduction 2. Experimental 2.1. Materials and instrumentation 2.2. Single-crystal X-ray diffraction study 2.3. Preparation of N'1,N'3-bis(2-hydroxybenzylidene) malonohydrazide ligand (H4SLMH) 3. Results and discussion 3.1. Synthesis 3.2. Molecular structure of the complex 3.3. Reaction of the complex with hydrogen peroxide 4. Conclusion Acknowledgements Supporting information Disclosure statement ORCID and Email References PrintField10: PrintField11: PrintField12: PrintField13: PrintField14: PrintField15: PrintField20: PrintField21: PrintField22: PrintField23: PrintField24: PrintField25: