Synthesis of new heteronuclear complexes with bridging carbyne ligands between tungsten and gold. X-Ray crystal structure of [AuW(µ-CC6H4Me-4)(CO)2(bipy)(C6F5)Br]
Abstract
The compound [W(CR)(CO)2(η-C5H5)](R = C6H4Me-4)(1) reacts with [Au(C6F5)(tht)](tht = tetrahydrothiophene) to give the tungsten–gold complex [AuW(µ-CR)(CO)2(C6F5)(η-C5H5)](2), and the compound [W(CR)(CO)2(bipy)Br](bipy = 2,2′-bipyridine) reacts similarly with [Au(C6F5)(tht)] and [AuCl(tht)] to give the analogous complexes [AuW(µ-CR)(CO)2(bipy)X(Br)](4; X = C6F5) and (5; X = Cl). In complex (4), which has been structurally characterized by X-ray diffraction, there is a Au–W bond asymmetrically bridged by a CR group; the W atom carries a chelating bipyridine, one bromide, and two terminal carbonyls, while the gold carries a C6F5 group. The heterometallic complex (2) reacts with the reagents [Cu(thf)(η-C5Me5)] and [Pt(PMe3)2(C2H4)] to give respectively the trimetallic compounds [AuCuW(µ3-CR)(CO)2(C6F5)(η-C5H5)(η-C5Me5)](6) and [AuPtW(µ3-CR)(CO)2(PMe3)2(C6F5)(η-C5H5)](7). The latter compound can also be prepared by treating [Au(C6F5)(tht)] with [PtW(µ-CR)(CO)2(PMe3)2(η-C5H5)].