Synthesis, spectral studies of copper(II)tetrathiocyanato dithallate(I) complexes with some acylhydrazones and their antimicrobial activity

Heterobimetallic complexes of Cu[T1(SCN)(2)](2)center dot L (where L=acetophenone benzoylhydrazone(abh), acetophenone isonicotinoyl hydrazone(ainh), acetophenone salicyloylhydrazone(ash), acetophenone anthraniloyl hydrazone(aah), p-hydroxy acetophenone benzoylhydrazone (phabh), p-hydroxy acetophenone isonicotinoyl hydrazone (phainh), p-hydroxy acetophenone salicyloylhydrazone(phash) and p-hydroxy acetophenone anthraniloyl hydrazone(phaah) were synthesized and characterized. Electronic spectra and mu(eff) values suggest a distorted octahedral environment around copper(II). SCN groups bridge between two metal centers and the ligands are coordinated through >C=O and >C=N- groups. Thermal studies (TGA and DTA) on Cu[T1(SCN)(2)](2). ainh indicate multi step decomposition of both endothermic and exothermic nature. ESR data show axial spectra for all the complexes and d(x2-y2) as the ground state. Powder X-ray diffraction parameters for some of the complexes correspond to orthorhombic crystal lattice. The complexes show significant antifungal activity against Rizoctonia sp. and Stemphylium sp. and moderate antibacterial activity against Closiridium sp. and Pseudonionas sp. The activity increases at higher concentration or the compound.