title: Synthesis, characterization and reactivity of trinuclear Cu(II) complexes derived from disalicylaldehyde malonoyldihydrazone.
abstract: Three new homotrinuclear copper(II) complexes [Cu3(slmh)(μ-Cl)2(CH3OH)3]⋅0.5CH3OH (1), [Cu3(slmh)(NO3)2(CH3OH)5]⋅1.5CH3OH (2) and [Cu3(slmh)(μ-ClO4)2(CH3OH)3]⋅2CH3OH (3) from disalicylaldehyde malonoyldihydrazone have been synthesized and characterized. The composition of the complexes has been established on the basis of data obtained from analytical and thermoanalytical data. The structure of the complexes has been discussed in the light of molar conductance, electronic, FT-IR and far-IR spectral data, magnetic moment and EPR spectral studies. The molar conductance values for the complexes in DMSO solution indicate that all of them are non-electrolyte. The magnetic moment values for the complexes suggest considerable metal-metal intramolecular interaction between metal ions in the structural unit of the complexes. The EPR spectral features reveal that at RT, the ground state for the complexes is a mixture of the quartet state (S=3/2) and doublet state (S=1/2). At lower temperature, the ground state for the complexes is dx(2)-y(2) with considerable contribution from dz(2) orbital. Dihydrazone ligand is present in enol form in all of the complexes. The complexes have distorted square pyramidal stereochemistry. The electron transfer reactions of the complexes have been investigated by cyclic voltammetry. Hydrogen peroxide mediated oxidation of benzyl alcohol catalyzed by complex 1 has been studied.
authors.affiliation: Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India.
authors.forename: Angira
authors.initials: A
authors.lastname: Koch
authors.affiliation: Department of Chemistry, Faculty of Science and Agriculture, The University of West-Indies, St. Augustine, Trinidad and Tobago.
authors.forename: Arvind
authors.initials: A
authors.lastname: Kumar
authors.affiliation: Department of Science and Humanities, Tripura Institute of Technology, Narsingarh 799009, Tripura, India.
authors.forename: Arjun K
authors.initials: AK
authors.lastname: De
authors.affiliation: Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India.
authors.forename: Arnab
authors.initials: A
authors.lastname: Phukan
authors.affiliation: Department of Chemistry, North-Eastern Hill University, Shillong 793022, Meghalaya, India. Electronic address: ralal@rediffmail.com.
authors.forename: Ram A
authors.initials: RA
authors.lastname: Lal
mesh_terms: D000447:Aldehydes / Q000138:chemical synthesis / Q000737:chemistry*; D019905:Benzyl Alcohol / Q000737:chemistry; D002384:Catalysis; D056831:Coordination Complexes / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D004579:Electron Transport; D004583:Electrons; D006835:Hydrazones / Q000138:chemical synthesis / Q000737:chemistry*; D010084:Oxidation-Reduction; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000447:Aldehydes; D056831:Coordination Complexes; D006835:Hydrazones; C013243:salicylaldehyde; D003300:Copper; D019905:Benzyl Alcohol
keywords: Disalicylaldehyde malonoyldihydrazone; Magnetic moment; Spectroscopic studies and cyclic voltammetry; Trinuclear copper(II) complexes