190430-15-0Relevant academic research and scientific papers
Tri-N-pyrrolylsilyl complexes of ruthenium and osmium
Hübler, Klaus,Roper, Warren R.,Wright, L. James
, p. 2730 - 2735 (1997)
The development of a new, simple synthesis of tri-N-pyrrolylsilane (1) from trichlorosilane and pyrrole provides a convenient starting point for a series of interesting transition-metal complexes with the tri-N-pyrrolylsilyl ligand. Oxidative addition of 1 to M(CO)2(PPh3)3 gives the six-coordinate compounds M(SiPyr3)H(CO)2(PPh3)2 (Pyr = 1-NC4H4; 2a, M = Ru; 2b, M = Os), whereas overall phenyl group-silyl group exchange between MPhCl(CO)(PPh3)2 and 1 yields the five-coordinate species M(SiPyr3)Cl(CO)(PPh3)2 (3a, M = Ru; 3b, M = Os). The nitrosyl complex Os(SiPyr3)HCl(NO)(PPh3)2 (4) can be prepared from OsCl(NO)(PPh3)3 and 1. The carbonyl groups in these compounds show relatively high C-O stretching frequencies, which fall between those found for the trihydroxysilyl and trichlorosilyl analogues. Bond lengths and angles obtained from the X-ray structure determinations of HSiPyr3 (1) and Os(SiPyr3)H(CO)2(PPh3)2 (2b) indicate that the SiPyr3 moiety undergoes significant changes on coordination to osmium.
