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New dioxidomolybdenum(VI) complexes with the formula [MoO2L(MeOH)], derived from N'-(5-chloro-2-hydroxy-benzylidene)-2-methylbenzohydrazide (H2L1) and N'-(3,5-dichloro-2-hydroxybenzylidene)-2-methylbenzohydrazide (H2L2) were prepared. Crystal and molecular structures of the complexes were determined by single crystal X-ray dif-fraction method. Both complexes were further characterized by elemental analysis and FT-IR spectra. Single crystal X-ray structural studies indicate that the hydrazones L1 and L2 coordinate to the MoO2 cores through the enolate oxygen, phenolate oxygen and azomethine nitrogen. The Mo atoms in both complexes are in octahedral coordination. Catalytic properties for epoxidation of styrene by the complexes using PhIO and NaOCl as oxidant have been studied.
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Dalton Trans
August 2025
Department of Chemistry, S. V. National Institute of Technology Surat, Icchanath, Surat 395007, India.
Four hydrazone-based molybdenum(VI) complexes, namely [MoO(L)·HO] 1, [MoO(L)·HO] 2, [MoO(L)·HO] 3, [MoO(L)·HO] 4, were successfully synthesized utilizing hydrazone ligands H2L1-H2L4. The structural and physicochemical properties of these ligands and their corresponding molybdenum complexes were elucidated through a comprehensive array of spectroscopic and analytical techniques. Single-crystal X-ray diffraction analysis (SC-XRD) unambiguously confirmed that all four complexes adopt a distorted octahedral arrangement around the metal center.
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May 2024
Universidade da Coruña, Grupo NanoToxGen, Centro Interdisciplinar de Química y Biología (CICA), Departamento de Química, Facultade de Ciencias, Campus de A Coruna, 15071, A Coruna, , Spain.
Reaction of 2-chloromethyl-1H-benzimidazole with known intermediates (i-iii), prepared from diaminoguanidine hydrochloride with salicylaldehyde, 5-bromosalicylaldehyde or 3,5-di-tert-butylsalicylaldehyde, in the presence of triethylamine (NEt) led to the formation of benzimidazole appended new ligands, HL-HL (I-III). The homogeneous nitrogen-bridged symmetrical binuclear complexes, [(MoO)(L)(HO)] (1), [(MoO)(L)(HO)] (2) and [(MoO)(L)(MeOH)] (3) have been isolated by reacting these ligands with [MoO(acac)] in a 1 : 2 molar ratio in refluxing methanol. Using 1 : 1 (ligand to Mo precursor) molar ratio under above reaction conditions resulted in the corresponding mononuclear complexes, [MoO(HL)(MeOH)] (4), [MoO(HL)(HO)] (5) and [MoO(HL)(MeOH)] (6).
View Article and Find Full Text PDFTwo new dioxidomolybdenum(VI) complexes of [MoO2L(EtOH)] with aroylhydrazone ligands N'-(2-hydroxyl-3-methoxybenzylidene)-3-methylbenzohydrazide (H2L1) or 4-fluoro-N'-(2-hydroxylbenzylidene)benzohydrazide (H2L2) were prepared in ethanol under ambient temperature in air. Both complexes were characterized by elemental analysis, IR and UV-Vis spectroscopy, as well as single crystal X-ray determination. The Mo atoms in the complexes are in octahedral coordination.
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May 2023
Departamento de Química Inorgánica, Facultad de Química, Universidad de Sevilla, Aptdo. 1203, 41071 Sevilla, Spain.
Molybdenum-catalysed deoxydehydration (DODH) of vicinal diols to alkenes has been investigated using density functional theory (DFT). In particular, the mechanism of DODH of diols using a phosphane as a reductant and a [Mo(O)(Q)] complex (Q = acylpyrazolonate ligand) as a catalyst has been studied. This reaction was the first description of a Mo-catalysed DODH reaction.
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January 2023
Department of Chemistry, Faculty of Science, University of Zagreb, Horvatovac 102a, 10000 Zagreb, Croatia.
Molybdenum coordination complexes are widely applied due to their biological and pharmacological potential, as well as their performance in different catalytic processes. Parent dioxidomolybdenum Schiff base complexes were prepared via the reaction of [MoO(acac)] with a hydrazone Schiff-base tetradentate ligand. A new hydrazone-Schiff base (HL) and its corresponding mononuclear and polynuclear dioxidomolybdenum(VI) complex were synthesized and characterized by spectroscopic methods and elemental analyses, and their thermal behavior was investigated by thermogravimetry.
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