A Study on Coordination Compounds of Diacetylpyridine bis (semi-carbazone) with Some Transition, Metal Ions by Spectrophotometry

We synthesized 2,6-diacetylpyridine bis(semicarbazone)(DAPSC) and studied its coordination reaction with Cu, Co, Ni and Zn, in ethanol and in DMF spectrophotometrically. We realized that the ligand DAPSC in ethanol and in DMF does not dissociate and exists in ketonic form by conductometry and IK. The composition and stability constants of coordination compounds were calculated by graphic method and by self-written program. The results obtained by the two methods are in agreement with each other. The results showed that complexes of ML type were formed in ethanol and those of M₃L₂ tyPe in DMF. The sequence of lgβ is as follows: Co > Cu >Ni >Zn.