abstract
New organic-inorganic hybrid compounds, with formula (H(2)Arg)(3)[PM(12)O(40)](2)center dot 4H(2)O and (H(2)Arg)(4)[Si-M(12)O(40)]center dot nH(2)O (n = 0-1), where Arg = L-arginine and M = Mo, W, were prepared and characterized by analytical, spectroscopic, and X-ray diffraction techniques. Thermal analysis was performed to study their thermal stability. The crystal structure of (H(2)Arg)(3)[PMo(12\)O(40)](2)center dot 15H(2)O center dot EtOH (triclinic, space group P1, Z = 1) was determined by X-ray diffraction. The chiral H(2)Arg(2+) cations and the Keggin anions are involved in hydrogen bonding interactions which lead to the formation of an infinite three-dimensional network. This study adds new members to the important family of argininium/inorganic anions hybrid salts. To our best knowledge these are the first compounds of diprotonated arginine and Keggin-type polyoxoanions and also the first crystal structure determination of an argininium(2+) compound with an inorganic anion of the polyoxometalate family. (C) 2009 Elsevier B.V. All rights reserved.
keywords
NONLINEAR-OPTICAL MATERIAL; L-ARGININE HYDROCHLORIDE; SINGLE-CRYSTAL GROWTH; AMINO ACID COMPLEXES; BIOLOGICAL-ACTIVITY; NLO MATERIAL; ANIONS; PHOSPHATE; HETEROPOLYMOLYBDATES; MONOHYDRATE
subject category
Chemistry
authors
Santos, FM; Brandao, P; Felix, V; Cavaleiro, AMV; Gomes, ED; Belsley, MS
our authors
acknowledgements
Thanks are due to the FCT (Project POCFI/CTM/37713/2001), Universidade de Aveiro and CICECO for the financial support provided.