Chemistry of di- and tri-metal complexes with bridging carbene or carbyne ligands. Part 46. Synthesis of heteronuclear trimetal compounds from the dimetallic compounds [ReM(CC6H4Me-4)(CO)9](M = Cr, Mo, or W) and [CoW(CC6H4Me-4)(CO)8]; X-ray structure of [CrReFe(µ3-CC6H4Me-4)(µ-CO)(CO)11]