Improved synthesis of (η5-CpR)M(CO)4 compounds and the Nujol matrix photochemistry of (η5-C5H5)M(CO)4 and (η5-C9H7)M(CO)4, where M=Nb and Ta

Triple bonds of niobium with silicon, germaniun and tin: the tetrylidyne complexes [(κ3-tmps)(CO)2NbE–R] (E = Si, Ge, Sn; tmps = MeSi(CH2PMe2)3; R = aryl)

“…Attempts were also undertaken to access cationic tetrylidyne complexes. For this purpose, [CpNb(CO) 4 ] 31 was prepared using a slightly modified procedure 32 and irradiated in THF with a high-power blue light LED ( λ = 465 nm) in the presence of one equivalent of Ge(Ar Mes )Cl. IR monitoring of the reaction revealed a quite selective decarbonylation leading to the chlorogermylidene complex 5-Ge , which after work-up was isolated as red-orange, air-sensitive crystals in 25% yield ( Scheme 6 ).…”

The Microwave Spectrum of Cyclopentadienyl Niobium Tetracarbonyl

“…Vibrational studies of the effects of changing the central metal atom were reported by Bitterwolf et al (1,2). Changes in the C-O stretching frequencies were very small on substitution of the transition metal or substitutions on the cyclopentadienyl (C 5 H 5 ) ring for these complexes.…”

“…The samples of CpNb(CO) 4 were synthesized at the University of Idaho following procedures described earlier (1,2). Samples were resublimed prior to microwave measurements.…”

Low valent carbonylvanadium complexes of the triphosphorus macrocycle 12[ane]P3Et3

“…The same complex is obtained thermally. The non-phosphine containing vanadium dicarbonyl complex [CpV(CO) 2 ] has been prepared in a Nujol matrix, 22 and comparison of the IR stretches shows that the metal is binding more strongly to the remaining carbonyls, indicating that CO is a better π-acceptor than the phosphine, as expected. The CO stretches for (3) are similar to those reported with bidentate phosphines.…”