Synthesis,characterization and biological activities of cis-trans complexes [M(phen)(caf)2X2] M = Co(II),Fe(II),Mn(II),Cu(II); X: SCN-,CN-; caf: Caffeine; phen: (1,10)phenanthroline

Mixed ligands complexes of caffeine,phenanthroline,thiocyanato or cyano were prepared and characterized by molar conductivity measurements,ft-ir,uv-visible,epr,dta/dtg and x-ray diffraction studies. the complexes are of 1:1:2:2 (metal:phen:caf:cyano or thiocyanato) stoichiometry of general formula [m(phen)(caf)2x2] where x=cn-,scn-,m= co(ii),fe(ii),mn(ii),cu(ii),caf: caffeine; phen:phenanthroline,are non-electrolytes in dimethylsulfoxide. the atg/dtg curves provided information on the thermal stabilities and thermal decomposition of new synthesized complexes. the powder-diffraction data for complexes show that these complexes are crystallized in a monoclinic system. the ft-ir,uv-visible,epr,spectroscopic data suggested that the complexes have octahedral cis-trans geometry.