U . G Nwokeke, C . L. Peter


Binary complexes of Cadmium(II) with 1,10 phenanthroline , Cadmium(II) with purine, and tenary complex of  Cadmium(II) with 1,10 phenanthroline and purine were synthesized and characterized using UV-visible spectrophotometer, FTIR, and Powder X-ray diffraction(PXRD). Antimicrobial activity of the complexes were also carried out. The three complexes were found to be soluble in Dimethyl sulphu oxide(DMSO), pentanol, methanol, ethanol and distilled water. The following melting points were observed for the complexes as specified.  Cd(purine)  261oC- 260oC, Cd(phen)  276oC-274oC, Cd(purine)(phen) 250oC - 249 oC. The FT-IR spectra observed in all the complexes showed C-O around 1513.3-1621.4 cm-1, C=C around 1423-1576.7 cm-1,  COOH around 3600-2500 cm-1 and OH around 3700-3400 cm-1, UV- visible  of Cd(phen) complex have peaks at 294nm,Cd(purine) has maximum peak at 206 nm, Cd(purine)(phen) has peak at 209nm. The PXRD of all the three complexes showed crystallographic study of complexes proving that complexation occurred. The result of these studies show the coordination sites for the ligand with the metal ion were to be through the nitrogen and Cd for the Cd(phen) complex and through the nitrogen, oxygen and cadmium for the Cd(purine) complex. According to the observations, the octahedral geometric structure for the synthesized complexes were suggested,   but for the the Cd(purine)(phen) which shows the coordination sites for the ligand with the metal ion were to be through the nitrogen of the mixed ligands and cadmium, the tetrahedral geometry structure for the synthesized complex were suggested. All complexes showed good antibacterial activity especially the Cd(phen)(purine) complex but has less activity to fungi.

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