New diarylplatinum complexes containing 4,5-diazafluoren-9-one; synthesis, characterization, X-ray crystallography structure investigation and oxidative addition reaction studies

Abstract

The synthesis of a new diarylplatinum(II) complex containing 4,5-diazafluoren-9-one (DAFO) was reported using the reaction of [Pt(p-tolyl)2(S(CH3)2)2] and DAFO with one to one equivalent. The platinum(IV), [PtIMe(p-tolyl)2DAFO], was then formed through the oxidative addition (OA) of iodomethane and [Pt(p-tolyl)2DAFO]. In the synthesized complexes, the DAFO was coordinated to the metal center as a chelating reagent through the nitrogen atoms. Identifications of the compounds were achieved using various techniques such as proton NMR, UV-Vis, FT-IR, CHN analyses. Furthermore, the organoplatinum(II) structure, involving DAFO, has been identified using single crystal X-ray crystallography. The band of MLCT in the visible region of Pt(II) was decayed in the oxidative addition and producing Pt(IV) complex. This variation in the visible region was applied to calculate the activation parameters of the reaction. The excess amounts of iodomethane were utilized to make pseudo-firstorder status. At different temperatures kobs, k2, entropy and enthalpy changes of activation were determined.