Mixed transition–metal complexes based on multitopic 1,3,5-triethynyl- and 1-diphenylphosphino-3,5-diethynyl-benzene linking units

The synthesis and reaction chemistry of heteromultimetallic transition metal complexes in which Fc, [(η6-C6H5)Cr(CO)3], [(Ar3P)Au], [AuCC-bpy] and [{[Ti](μ-σ,π-CCSiMe3)2}Cu]+ units (Fc = (η5-C5H4)(η5-C5H5)Fe; [Ti] = (η5-C5H4SiMe3)2Ti; bpy = 2,2′-bipyridyl-5-yl) are linked by alkynyl-, benzene- and phosphane- or bipyridyl-based connecting moieties is discussed. In context with this background the preparation of neutral heterotrimetallic 1-(FcCC)-3-[(CO)3Cr(η6-C6H5CC)]-5-[(Ph3P)AuCC]C6H3 (10) and ionic heteropentametallic [1-(FcCC)-3-[(CO)3Cr(η6-C6H5CC)]-5-[(PPh2)AuCC-bpy({[Ti](μ-σ,π-CCSiMe3)2}Cu)]C6H3](PF6) (19) from 1-iodo-3,5-dibromobenzene (1) is reported by applying consecutive reaction methodologies including substitution, complexation and carbon–carbon cross-coupling reactions. entities of all complexes have been confirmed by elemental analysis and IR, 1H and 31P{1H} NMR spectroscopy; heteropentametallic 19 was additionally characterized by ESI-TOF mass-spectrometry.