http://www.cnr.it/ontology/cnr/individuo/prodotto/ID169336
Fe(II), Ru(II) and Re(I) complexes of endotopic, sterically non-hindering, U-shaped 8,8'-disubstituted-3,3'-biisoquinoline ligands: syntheses and spectroscopic properties (Articolo in rivista)
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- Fe(II), Ru(II) and Re(I) complexes of endotopic, sterically non-hindering, U-shaped 8,8'-disubstituted-3,3'-biisoquinoline ligands: syntheses and spectroscopic properties (Articolo in rivista) (literal)
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Ventura B., Barigelletti F., Durola F., Flamigni L., Sauvage J.-P., Wenger O.S. (2008)
Fe(II), Ru(II) and Re(I) complexes of endotopic, sterically non-hindering, U-shaped 8,8'-disubstituted-3,3'-biisoquinoline ligands: syntheses and spectroscopic properties
in Dalton transactions (2003. Print)
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- Ventura B., Barigelletti F., Durola F., Flamigni L., Sauvage J.-P., Wenger O.S. (literal)
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- Sauvageb and Oliver S. Wengerb aIstituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via P. Gobetti 101, 40129, Bologna, Italy. E-mail: bventura@isof.cnr.it bLaboratoire de Chimie Organo-Minérale, LC3 du CNRS, Institut de Chimie, Université Louis Pasteur, 4 rue Blaise Pascal, 67070, Strasbourg Cedex, France (literal)
- Titolo
- Fe(II), Ru(II) and Re(I) complexes of endotopic, sterically non-hindering, U-shaped 8,8'-disubstituted-3,3'-biisoquinoline ligands: syntheses and spectroscopic properties (literal)
- Abstract
- The redox behaviour, optical-absorption spectra and emission properties of U-shaped and elongated disubstituted biisoquinoline ligands and of derived octahedral Fe(II), Ru(II), and Re(I) complexes are reported. The ligands are 8,8-dichloro-3,3-biisoquinoline (1), 8,8-dianisyl-3,3-biisoquinoline (2), and 8,8-di(phenylanisyl)-3,3-biisoquinoline (3), and the complexes are [Fe(2)3]2+, [Fe(3)3]2+, [Ru(1)(phen)2]2+, [Ru(2)3]2+, [Ru(3)3]2+, [Re(2)(py)(CO)3]+, and [Re(3)(py)(CO)3]+. For the ligands, the optical properties as observed in dichloromethane are in line with expectations based on the predominant 1* nature of the involved excited states, with contributions at lower energies from 1n* and 1ILCT (intraligand charge transfer) transitions. For all of the Fe(II), Ru(II), and Re(I) complexes, studied in acetonitrile, the transitions associated with the lowest-energy absorption band are of 1MLCT (metal-to-ligand charge transfer) nature. The emission properties, as observed at room temperature and at 77 K, can be described as follows: (i) the Fe(II) complexes do not emit, either at room temperature or at 77 K; (ii) the room-temperature emission of the Ru(II) complexes (em > 10-3, in the µs range) is of mixed 3MLCT/3LC character (and similarly at 77 K); and (iii) the room-temperature emission of the Re(I) complexes (em 3 × 10-3, < 1 ns) is of 3MLCT character and becomes of 3LC (ligand-centered) character ( in the ms time scale) at 77 K. The interplay of the involved excited states in determining the luminescence output is examined. (literal)
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