Main group bismuth(iii), gallium(iii) and diorganotin(iv) complexes derived from bis(2-acetylpyrazine)thiocarbonohydrazone: synthesis, crystal structures and biological evaluation
Main group bismuth(iii), gallium(iii) and diorganotin(iv) complexes derived from bis(2-acetylpyrazine)thiocarbonohydrazone: synthesis, crystal structures and biological evaluation
Polynuclear complexes of a series of hydrazone and hydrazone–oxime ligands – M2 (Fe), M4 (Mn, Ni, Cu), and Mn (Cu) examples
作者:Marcus W. Drover、Santokh S. Tandon、Muhammad U. Anwar、Konstantin V. Shuvaev、Louise N. Dawe、Julie L. Collins、Laurence K. Thompson
DOI:10.1016/j.poly.2013.10.018
日期:2014.1
Tetranuclear, dinuclear and chain complexes involving some polyfunctional hydrazone and thiocarbohydrazone-based ligands are discussed. Ni(II) and Mn(II) [2 x 2] grids form with mu(2)-S and mu(2)-O bridges respectively, and are antiferromagnetically coupled (J = -167(5), -3.59(2) cm(-1) respectively). With the Fe(II) based system oxidation to Fe(III) occurs, and a mu(2)-O-hydrazone bridged dimer results, with antiferromagnetic exchange between the S = 5/2 spin centers (J = -22.5(2) cm(-1)). In the case of Cu(II) the diazine group acts as a mu(2)-N-N bridge between Cu(II) centers in two cases involving a tetranuclear and a chain complex. Non-orthogonal bridging through N-N and carboxylate bridges leads to antiferromagnetic exchange in the tetranuclear case (J = -32.7(7), -16.1(7) cm(-1) respectively) and ferromagnetic exchange in the chain complex due to orthogonal N-N bridging (J = 3.3(1) cm(-1)). (C) 2013 Elsevier Ltd. All rights reserved.