1047979-34-9Relevant academic research and scientific papers
Mixed-transition-metal acetylides: Synthesis and characterization of complexes with up to six different transition metals connected by carbon-rich bridging units
Packheiser, Rico,Ecorchard, Petra,Rueffer, Tobias,Lang, Heinrich
experimental part, p. 4948 - 4960 (2009/04/16)
The synthesis and reaction chemistry of heteromultimetallic transition-metal complexes by linking diverse metal-complex building blocks with multifunctional carbon-rich alkynyl-, benzene-, and bipyridyl-based bridging units is discussed. In context with this background, the preparation of [1-{(η2-dppf)(η5-C5H 5)RuC=C)-3-{(tBu2bpy)(CO)3ReC≡C}-5- (PPh2)-C6H3] (10) (dppf=1,1′- bis(diphenyl-phosphino)ferrocene; tBu2bpy = 4,4′-diferi-butyl- 2,2′-bipyridyl; Ph = phenyl) is described; this complex can react further, leading to the successful synthesis of heterometallic complexes of higher nuclearity. Heterotetrametallic transition-metal compounds were formed when 10 was reacted with [((η5-C5Me5)-RhCl 2}2] (18), [(Et2S)2PtCl2] (20) or -(tht)AuC≡C-bpy] (24) (Me = methyl; Et = ethyl ; tht = tetrahydrothiophene ; bpy = 2,2′-bipyridyl-5-yl). Complexes [1-((η2-dppf)(η5-C5H 5)RuC=C}-3-{(tBu2bpy)(CO)3ReC≡C)-5- (PPh2RhCl2(η5-C5Me 5)C6H3] (19), [{1-[(η2-dppf) (η5-C5H5)RuC=C]-3-[(tBu2-bpy) (CO).,ReC=-C]-5-(PPh2)C6H3}2- PtCl2] (21), and [1-((η2-dppf)(η5- C5H5)-RuC≡C}-3-((tBu2bpy)(CO) 3ReC≡C)-5-(PPh2AuC≡C-bpy)C6H 3] (25) were thereby obtained in good yield. After a prolonged time in solution, complex 25 undergoes a transmetallation reaction to produce [(tBu2bpy)(CO)3ReC≡C-bpy] (26). Moreover, the bipyridyl building block in 25 allowed the synthesis of Fe-Ru-Re-Au-Mo- (28) and Fe-Ru-Re-Au-Cu-Ti-based (30) assemblies on addition of [(nbd)Mo(CO) 4] (27), (nbd = 1,5-norbornadiene), or [{[Ti](μ-σ,π- C≡CSiMe3)2)Cu(N=CMe)]-[PF6] (29) ([Ti] = (η5-C5H4SiMe3)2Ti) to 25. The identities of 5, 6, 8, 10-12, 14-16, 19, 21, 25, 26, 28, and 30 have been confirmed by elemental analysis and IR, 1H, 13C{ 1H}, and 31P{1H} NMR spectroscopy. From selected samples ESI-TOF mass spectra were measured. The solid-state structures of 8, 12, 19 and 26 were additionally solved by single-crystal X-ray structure analysis, confirming the structural assignment made from spectroscopy.
