resumo
Several novel compounds with the non-linear optical chromophore 2-amino-5-nitropyridine (2A5NP) and Keggin polyoxoanions (alpha-isomers), having the general formula (2A5NP)(m)H-n[XM12O40]center dot xH(2)O, M = Mo, W, were synthesised. Compounds were obtained with X = P, n = 3, m = 3 and 4 and X = Si, n = m = 4 ( x = 2 - 6). Thus, for each of the anions [PMo12O40](3-) and [PW12O40](3-) two different compounds were obtained, with the same anion and organic counterpart but with a different stoichiometric ratio. These presented different charge transfer properties and thermal stability. All compounds were characterised by spectroscopic and analytical techniques. The single crystal X-ray diffraction structure of (2A5NP)(4)H-3[PMo12O40]center dot 2.5H(2)O center dot 0.5C(2)H(5)OH showed that the water solvent molecules and the organic chromophores are assembled via infinite one-dimensional chains of hydrogen bonds with formation of open channels, which accommodate [ PMo12O40] 3- and ethanol solvent molecules.
palavras-chave
INTERMOLECULAR PHOTOSENSITIVE COMPLEX; 3RD-ORDER OPTICAL NONLINEARITIES; RAY CRYSTAL-STRUCTURE; MOLECULAR-STRUCTURE; ORGANIC SUBSTRATE; STRUCTURAL CHARACTERIZATION; TRANSFER SALT; POLYOXOMETALATE; SPECTROSCOPY; HETEROPOLY
categoria
Chemistry
autores
Gamelas, JAF; Santos, FM; Felix, V; Cavaleiro, AMV; Gomes, ED; Belsley, M; Drew, MGB
nossos autores
Ana Maria Vieira Silva Viana Cavaleiro
Professor Catedrático
José António Ferreira Gamelas
Bolseiro de pós-Doutoramento