Chemistry of platinum(IV), platinum(II) and palladium(II) cyclometallates of benzylthio- or benzosulphinyl-substituted azobenzenes

Chattopadhyay, Surajit ; Sinha, Chittaranjan ; Basu, Partha ; Chakravorty, Animesh (1991) Chemistry of platinum(IV), platinum(II) and palladium(II) cyclometallates of benzylthio- or benzosulphinyl-substituted azobenzenes Journal of Organometallic Chemistry, 414 (3). pp. 427-431. ISSN 0022-328X

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/002232...

Related URL: http://dx.doi.org/10.1016/0022-328X(91)86340-V

Abstract

Cyclometallated platinum(IV) complexes of the type [Pt(RL)Cl3] incorporating azobenzene (R = H) or 4-methylazobenzene (R = Me) with an SCH2Ph (L = L1) or an S(O)CH2Ph (L = L2) substituent in an ortho position are described. These were obtained by oxidative addition of chlorine to [PtII(RL)Ci]. Analogous palladium(II) complexes, however, gave chloro-substituted azobenzenes upon reaction with chlorine. The platinum(IV) complexes show an irreversible cyclic voltammetric metal reduction peak near -0.3 V vs SCE. Constant potential coulometric reduction at -0.5 V or chemical reduction by hydrazine hydrate regenerated [PtII(RL)Cl]. The structures of [Pt(HL1)Cl3], Pt(MeL2)Cl] and [Pd(MeL(su1)Cl] have been determined by an X-ray diffraction study. The S(O)CH2Ph group is coordinated via the sulphur atom.

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