Synthesis and spectral characterization of mono and binuclear copper II complexes derived from 2 benzoylpyridine N4 methyl 3 thiosemicarbazone Crystal structure of a novel sulfur bridged copper II box dimer Journal Article


Author(s): Jayakumar, K.; Sithambaresan, M.; Aiswarya N; Kurup, M R P
Article Title: Synthesis and spectral characterization of mono and binuclear copper II complexes derived from 2 benzoylpyridine N4 methyl 3 thiosemicarbazone Crystal structure of a novel sulfur bridged copper II box dimer
Alternate Title: Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Keywords: Thiosemicarbazone; 2-Benzoylpyridine; EPR; X-ray crystal structure; Copper(II)-iodo box dimer complex
Journal Title: Unknown
Volume: 139
Publisher: Kerala Science Congress  
Date Published: 2015
Start Page: 28
End Page: 36
DOI/URL:
Notes: --- - "Mononuclear and binuclear copper(II) complexes of 2-benzoylpyridine-N4-methyl thiosemicarbazone (HL) were prepared and characterized by a variety of spectroscopic techniques. Structural evidence for the novel sulfur bridged copper(II) iodo binuclear complex is obtained by single crystal X-ray diffraction analysis. The complex [Cu2L2I2], a non-centrosymmetric box dimer, crystallizes in monoclinic C2/c space group and it was found to have distorted square pyramidal geometry (Addison parameter, \xCF\x84 = 0.238) with the square basal plane occupied by the thiosemicarbazone moiety and iodine atom whereas the sulfur atom from the other coordinated thiosemicarbazone moiety occupies the apical position. This is the first crystallographically studied system having non-centrosymmetrical entities bridged via thiolate S atoms with Cu(II)I bond. The tridentate thiosemicarbazone coordinates in mono deprotonated thionic tautomeric form in all complexes except in sulfato complex, [Cu(HL)(SO4)]\xC2\xB7H2O (1) where it binds to the metal centre in neutral form. The magnetic moment values and the EPR spectral studies reflect the binuclearity of some of the complexes. The spin Hamiltonian and bonding parameters are calculated based on EPR studies. In all the complexes g|| &gt; g\xE2\x8A\xA5 &gt; 2.0023 and the g values in frozen DMF are consistent with the dx2-y2 ground state. The thermal stabilities of some of the complexes were also determined." - "<p>Export Date: 18 February 2015</p>"