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Synthesis, spectral, thermal and crystallographic investigations on oxovanadium(IV) and manganese(III) complexes derived from heterocyclic β-diketone and 2-amino ethanol

Content Provider	Springer Nature Link
Author	Thaker, B. T. Surati, Kiran R. Oswal, Shantilal Jadeja, R. N. Gupta, Vivek K.
Copyright Year	2007
Abstract	Novel mononuclear oxovanadium(IV) and manganese(III) complexes [VO(L$^{1}$)$_{2}$·H$_{2}$O] (1); [VO(L$^{2}$)$_{2}$·H$_{2}$O] (2); [VO(L$^{3}$)$_{2}$·H$_{2}$O] (3); [Mn(L$^{1}$)$_{2}$]ClO$_{4}$·H$_{2}$O (4); [Mn(L$^{2}$)$_{2}$] ClO$_{4}$·H$_{2}$O (5); [Mn(L$^{3}$)$_{2}$]ClO$_{4}$·H$_{2}$O (6) were prepared by condensation of 1 mol of VOSO$_{4}$·5H$_{2}$O or Mn(OAc)$_{3}$· 2H$_{2}$O with 2 mol of ligand HL$^{1}$, HL$^{2}$ or HL$^{3}$ (where HL$^{1}$ = 4-[(2-hydroxy-ethylamino)-methylene]-5-methyl-2- phenyl-2,4-dihydro-pyrazol-3-one; HL$^{2}$=4-[(2-hydroxy-ethylamino)-methylene]-5-methyl-2-p-tolyl-2,4-dihydro-pyrazol-3-one; HL$^{3}$=4-{4-[(2-hydroxy-ethyl-amino)-methyl]-3-methyl-5-oxo-4,5-dihydropyrazol-1-yl} benzene sulfonic acid). The resulting complexes were characterized by elemental analyses, molar conductance, magnetic and decomposition temperature measurements, electron spin resonance, FAB mass, IR and electronic spectral studies. From TGA, DTA and DSC, the thermal behaviour and degradation kinetic were studied. Electronic spectra and magnetic susceptibility measurements indicate distorted octahedral stereochemistry of oxovanadium(IV) complexes and regular octahedral stereochemistry of manganese(III) complexes. Hamiltonian and bonding parameters found from ESR spectra indicate the metal ligand bonding is partial covalent. The X-ray single crystal determination of one of the representative ligand was carried out which suggests existence of amine-one tautomeric form in the solid state. The $^{1}$H-NMR spectra support the existence of imine-ol form in solution state. The LC-MS studies sustain the$^{1}$H-NMR result. The electronic structure of the same representative ligand was optimized using 6-311G basis set at HF level ab initio studies to predict the coordinating atoms of the ligand.
Starting Page	295
Ending Page	310
Page Count	16
File Format	PDF
ISSN	10400400
Journal	Structural Chemistry
Volume Number	18
Issue Number	3
e-ISSN	15729001
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2007-02-07
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acyl pyrazolone OV(IV) complexes Mn(III) complexes Ab initio calculations Crystal structure Theoretical and Computational Chemistry Physical Chemistry Computer Applications in Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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Synthesis, spectral, thermal and crystallographic investigations on oxovanadium(IV) and manganese(III) complexes derived from heterocyclic β-diketone and 2-amino ethanol