Stepwise synthesis of tungsten?platinum or ?gold bonds bridged by alkylidyne ligands: X-ray crystal structures of [Pt3W2(�3-CR)2(CO)4-(?-C5H5)2(cod)2](cod ? cyclo-octa-1,5-diene), [Pt2W3(�-CR)2(�3-CR)(CO)6(?-C5H5)3], and [AuW2(�-CR)2(CO)4(?-C5H5)2][PF6]

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