189190-22-5Relevant articles and documents
Syntheses and reactivity of ruthenium σ-pyridylacetylides
Wu, Iuan-Yuan,Lin, Jiann T.,Luo, Jimmy,Sun, Shih-Sheng,Li, Chyi-Shiun,Lin, Kuan J.,Tsai, Chiitang,Hsu, Chia-Chen,Lin, Jiunn-Lin
, p. 2038 - 2048 (2008/10/08)
Ruthenium σ-acetylides containing a dangling pyridine were synthesized from the reactions of CpRu(L)2Cl (L = PPh3, 1/2 (C5H4PPh2)2Fe) with 4-ethynylpyridine, (E)-1-(4-ethynylphenyl)2-(4-pyridyl)ethylene, or 4-(ethynylphenyl)(4-pyridyl)acetylene in the presence of NH4+PF6- followed by deprotonation with a base. The dangling pyridine can be protonated, methylated, or ligated to tungsten carbonyl fragments. The ruthenium donor to the pyridinium acceptor charge-transfer absorption appears at longer wavelength as the conjugation chain becomes longer. The quadratic hyperpolarizabilities of the methylated derivatives were determined using the hyper Rayleigh scattering method. X-ray analysis was employed to examine the structure of the dinuclear complex Ru(C≡CC5H4N{W(CO)4(PPh 3)})(η2-dppf)(η5-C5H 5) (dppf = 1,1′-bis(diphenylphosphino)ferrocene).