title: Synthesis, spectral investigation and thermal aspects of coordination polymeric chain assemblies of some transition metal ions with bis-pyrazolones.
abstract: A few coordination chain polymeric assemblies of the type [M(SB)(H(2)O)(2)](n).xH(2)O or [VO(SB)(H(2)O)](n).H(2)O [where M=Mn(II), Cu(II) and Zn(II), x=1; Co(II) and Ni(II) x=2, H(2)SB=(4Z,4'Z)-4,4'-(2,2'-(4,4'-methylenebis(4,1-phenylene)bis(azanediyl))bis(1-hydroxy ethan-2-yl-1-ylidene))bis(3-methyl-1-phenyl-1H-pyrazol-5(4H)-one)] have been investigated. Structural and spectroscopic properties have been studied on the basis of elemental analyses, infrared spectra, (1)H and (13)C NMR spectra, electronic spectra, magnetic measurements and thermo gravimetric analyses. FT-IR, (1)H and (13)C NMR studies reveal that the ligand (H(2)SB) exists in the tautomeric enol form in both the states with intramolecular hydrogen bonding. Magnetic moment and reflectance spectral studies reveal that an octahedral geometry has been assigned to all the prepared coordination polymers. The kinetic parameters such as order of reaction (n) and the energy of activation (E(a)) have been reported using Freeman-Carroll method. The pre-exponential factor (A), the activation entropy (DeltaS(#)), the activation enthalpy (DeltaH(#)) and the free energy of activation (DeltaG(#)) have been calculated.
authors.affiliation: Department of Chemistry, Sardar Patel University, Vallabh Vidyanagar, Gujarat 388120, India. chetank.modi1@gmail.com
authors.forename: C K
authors.initials: CK
authors.lastname: Modi
mesh_terms: D004055:Differential Thermal Analysis; D007477:Ions / Q000737:chemistry / Q000378:metabolism; D007536:Isomerism; D008670:Metals / Q000737:chemistry* / Q000378:metabolism; D008954:Models, Biological; D008956:Models, Chemical; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry / Q000378:metabolism; D047069:Pyrazolones / Q000138:chemical synthesis* / Q000737:chemistry* / Q000378:metabolism; D013057:Spectrum Analysis; D028561:Transition Elements / Q000737:chemistry* / Q000378:metabolism
chemical_list: D007477:Ions; D008670:Metals; D011108:Polymers; D047069:Pyrazolones; D028561:Transition Elements