Heterometallic heterochalcogenmethylarsenide clusters: Synthesis, molecular structures, and thermolysis

Reactions of the arsinechalcogenide complexes [Fe 3 (μ 3 -X)(μ 3 -AsCH 3 )(CO) 9 ] (X = Se ( Ia ) or Te ( Ib )) with (PPh 3 ) 2 Pt(PhC≡CPh) (transmetalation reaction) and Cp 2 Cr 2 (SCME 3 ) 2 S (Cp = π-C 5 H 5 ) (photochemical reaction) gave the heterometallic (heterochalcogen)(methylarsine) clusters [(PPh 3 ) 2 Pt(μ 3 -X)(μ 3 -AsCH 3 )Fe 2 (CO) 6 ] ( II and III , respectively), as well as Fe 3 (μ 3 -X)(μ 3 -AsCH 3 )(CO) 8 (C 5 H 5 ) 2 Cr 2 (μ 3 -S)(μ 2 -S t Bu) 2 ( IV and V , respectively). The structures of complexes II, IV , and V were determined by X-ray diffraction analysis. Thermolysis of all the complexes yielded no metal carbides or oxides.