نتایج جستجو برای: metallocenes
تعداد نتایج: 172 فیلتر نتایج به سال:
In this paper we report high-resolution solid state 1 C NMR investigations of various metallocenes [(Ti5-C5H5)M(Ti5-C5H5); M = Fe, Ru, Ni], carried out as a function of magic angle sample spinning (MAS) frequency. Specifically, we focus on how the linewidth of the isotropic peak varies with MAS frequency at fixed temperature. Unexpectedly, it has been found that the linewidth increases as the M...
Metallocene-bridged [60]fullerene triads and cyclised metallocene-[60]fullerene diads are formed via [3 + 2] cycloaddition reactions of [60]fullerene with metallocene dialdehyde and an amino acid. In the case of cyclic diads only one regioisomer is formed, as determined by UV-vis and NMR spectroscopic studies. These compounds have both electron donor (metallocene) and acceptor ([60]fullerene) c...
The first metalated porphyrazinediols 11 have been prepared from (L)-(+)-dimethyl tartrate via conversion into the corresponding dispoke or 2,3-dimethoxy-2,3-butanediyl protected 2,3-dihydroxymaleonitrile, Linstead macrocyclization, transmetalation, and deprotection. Their stability is very dependent on the nature of the metal ion in the cavity of the porphyrazine. Reaction of these porphyrazin...
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