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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Ito, Megumi Ishitani, Osamu Koike, Kazuhide Morimoto, Tatsuki Kojima, Tatsuhiro Ozeki, Tomoji |
| Description | Author Affiliation: Morimoto T ( Department of Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1-E1-9 O-okayama, Tokyo, 152-8551, Japan.) |
| Abstract | A series of rhenium(I) diimine complexes $cis,trans-[Re(dmb)(CO)_{2}(PR^{1}R^{2}R^{3})(PR^{4}R^{5}R^{6})]^{+}$ (dmb=4,4′-dimethyl-2,2′-bipyridine, $R^{n}=phenyl$ or alkyl), each of which bears two phosphine ligands with various numbers of phenyl groups, has been synthesized by using the photochemical ligand-substitution reaction. Detailed studies of the structural features, not only in the crystal but also in solution, indicate that the number of phenyl groups is a crucial factor in controlling the rotational conformation of the phosphine ligands, which in turn determines the extent of the π–π interaction between the aromatic diimine ligand and the phenyl group(s). The π–π interaction strongly affected both electrochemical and photophysical properties: 1) the oxidation power of the Re complex became stronger, 2) the lifetime of the excited state became longer, and 3) the Stokes shift between the $^{1}MLCT$ absorption band and emission from the corresponding $^{3}MLCT$ excited state became smaller. In particular, the diphenyl and triphenyl phosphine had much greater influence on the properties than the monophenyl phosphine ligand. Dual emission was observed from the different rotational conformers of the complexes with an intermediate number of phenyl groups in the phosphine ligands. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 11 |
| Volume Number | 18 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2012-03-12 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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