期刊
COMPTES RENDUS CHIMIE
卷 13, 期 8-9, 页码 1035-1047出版社
centre Mersenne pour ldition scientifique ouverte
DOI: 10.1016/j.crci.2010.03.017
关键词
Phosphorus heterocycles; Nitrogen heterocycles; Metallacycles; Gold; Platinum
资金
- Ministry of Education, Culture, Sports, Science and Technology, Japan [21108511]
- Grants-in-Aid for Scientific Research [21108511] Funding Source: KAKEN
2,5-Bis(pyrrol-2-yl)phosphole derivatives were prepared using the reaction of titanacycles, generated in situ from a Ti-II reagent and pyrrole-capped 1,6-heptadiynes, with dichloro(phenyl)phosphine. The 2,5-bis(pyrrol-2-yl)phosphole derivatives were found to possess narrower optical HOMO-LUMO gaps and less positive oxidation potentials than those of previously reported 2,5-diarylphosphole analogs. This demonstrates that the intrinsic nature of the electron excessive pyrrole subunits as well as the effective pi-conjugation over the coplanar heterole rings. The sigma(3)-P type 2,5-bis(5-phenylpyrrol-2-yl)phosphole underwent complexation with AuCl(SMe2) and PtCl2 to yield the respective AuCl-monophosphine and PtCl2-bisphosphine complexes. In the square planar Pt-II complex, the pyrrolic NH protons were found to form intramolecular hydrogen bonds with the chlorine atoms that gave rise to symmetrically split, parallel pi-chromophores linked by two Pt-P bonds. Density functional theory calculations on a Pt-II model complex suggested that this cooperative interaction induces a significant split of the original LUMOs of the symmetrical pi-conjugated ligands. (C) 2010 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
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