Reactivity of the metalloligand [Pt₂(µ-S)₂(PPh₃)₄] toward tellurium(II) thiourea complexes: synthesis and structural characterization of the ditellurium(I) derivative [{Pt₂(µ-S)₂(PPh₃)₄}₂Te₂]²⁺

Abstract

Reaction of the platinum(II) sulfide metalloligand [Pt2(-S)2(PPh3)4] with the tellurium(II) source TeCl2(tu)2 (tu = thiourea) is dependent on reaction conditions employed. In the presence of added acid, the dominant species observed in the Electrospray Ionisation (ESI) mass spectrum is the tetraplatinum species [{Pt2(µ-S)2(PPh3)4}2Te2] 2+. This contains the Te2 2+ moiety and is related to the previously reported tellurium(I) dithiophosphinate analogue [(Ph2PS2)2Te2]. However, in the absence of acid, considerable degradation of the {Pt2S2} metalloligand occurs as evidenced by the formation of the mononuclear complex [Pt{SC(NH2)NH}(PPh3)2] + containing a deprotonated thiourea ligand, together with other thiourea-containing ions, identified by ESI MS. Likewise, attempted use of a fullysubstituted thiourea, viz. Me2NC(S)NMe2 (tmtu) in TeCl2(tmtu)2, also resulted in degradation of the {Pt2S2} core and detection of the known complex [(Ph3P)2PtCl{SC(NMe2)2}] +. The [{Pt2(µ-S)2(PPh3)4}2Te2] 2+ cation was isolated with several anions, and unequivocal confirmation of the structure of the complex was obtained by an X-ray structure determination on the BF4salt, which shows the presence of the Te2 2+ unit, with the Te-Te bond bridged by two {Pt2S2} metalloligands.