M. Ônishi
Oct 1, 1991
Citations
1
Influential Citations
22
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
Trichloro(nitrosyl)ruthenium(III) was treated with alkali-metal or thallium poly(1-pyrazolyl)borates M(BRPz3) (Pz=1-pyrazolyl) to give new nitrosyl[poly(1-pyrazolyl)borato]ruthenium(III) complexes [RuCl2(BRPz3)(NO)] (1, R=Pz; 2, R=H). A similar reaction with thallium tris(3,5-dimethyl-1-pyrazolyl)hydroborate TlBH(3,5-Me2Pz)3 (3,5-Me2Pz=3,5-dimethyl-1-pyrazolyl) afforded the complex [RuCl2{BH(3,5-Me2Pz)3}(NO)] (3) as the minor product and the 3,5-dimethylpyrazole complex [RuCl3(NO)(3,5-Me2PzH)2] as the major one. The observation of ν(NO) bands over the range 1870 to 1900 cm−1 determined the NO+ linear coordination mode in these complexes, rather than NO− bent one. The ν(NO) values of 1–3 were larger than those of the corresponding known π-cyclopentadienyl analogues by ca. 90 cm−1, indicating a smaller degree of π-back donation of metal–NO bonds in the former complexes. 1H, 13C, and 1B NMR data of the new complexes are described. In 1H NOE measurements of 1, irradiation at a chemical shift of 5-H protons in...