New Coordinative Compounds with 4-(4'-pyridyl)pyridinium Disubstituted Monoylides
Croatica Chemica Acta
The complexes with manganese(II), iron(II), cobalt(II), nickel(II) and copper(II) of 2-(4, 4'-bipyridin-1-ium-1-yl)-1-(4-bromophenylamino)-3-(4-methoxyphenyl)-3-oxo-1-thioxopropan-2-ide (ylide, Y) were synthesized and characterized. The obtained compounds with 1 : 2 metal/ligand ratios have been characterized by FTIR, UV Vis spectroscopy, ESI MS spectrometry, molecular conductance, magnetic measurements and thermal analysis. The ylide ligand forms chelates with metallic (II) ions through their
... ions through their amide nitrogen and oxygen atoms. 7.81 %), which corresponds to the elimination of C7H4. In the final decomposition step, in the range 672-820 °C, the last organic groups (C6H4-C=O) are eliminated (found loss 9.25 %, calculated loss 7.23 %). The amount of residue 7.12 % over 820 °C is in agreement with the calculated value for CuO (7.10 %).  The proposed structure of these complexes is presented in Figure 5 . CONCLUSIONS The 2-(4,4'-bipyridin-1-ium-1-yl)-1-(4-bromophenylamino)-3-(4-methoxyphenyl)-3-oxo-1-thioxopropan-2-ide acts as bidentate N-ylide ligand and coordinates in 1 : 2 molar ratio M : L with manganese(II), iron(II), cobalt(II), nickel(II) and copper(II). The coordination chemistry of the resulting complexes 2, 3, 4, 5, 6 has been investigated, and it has been shown that ligand 1 promotes a square-planar geometry for the complexes.