| Abstract
| - Ruthenium σ-acetylides containing a dangling pyridine weresynthesized from the reactionsof CpRu(L)2Cl (L = PPh3,1/2(C5H4PPh2)2Fe)with 4-ethynylpyridine, (E)-1-(4-ethynylphenyl)-2-(4-pyridyl)ethylene, or4-(ethynylphenyl)(4-pyridyl)acetylene in the presence ofNH4+PF6-followed by deprotonation with a base. The dangling pyridine canbe protonated, methylated,or ligated to tungsten carbonyl fragments. The ruthenium donor tothe pyridinium acceptorcharge-transfer absorption appears at longer wavelength as theconjugation chain becomeslonger. The quadratic hyperpolarizabilities of the methylatedderivatives were determinedusing the hyper Rayleigh scattering method. X-ray analysis wasemployed to examine thestructure of the dinuclear complexRu(C⋮CC5H4N{W(CO)4(PPh3)})(η2-dppf)(η5-C5H5)(dppf= 1,1‘-bis(diphenylphosphino)ferrocene).
- Ruthenium σ-acetylides containing adangling pyridine were synthesized from the reactions ofCpRu(L)2Cl (L = PPh3,1/2(C5H4PPh2)2Fe)with 4-ethynylpyridine or(E)-1-(4-ethynylphenyl)-2-(4-pyridyl)ethylene in thepresence ofNH4+PF6-followed by deprotonation with a base. The dangling pyridine couldbe protonated, methylated, or ligated to tungsten carbonylfragments.
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