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
Ana Maria Vieira Silva Viana Cavaleiro
Full professor
Paula Cristina Ferreira da Silva Brandão
Assistant Researcher
Vítor Félix
Associate Professor with Aggregationacknowledgements
Thanks are due to the FCT (Project POCFI/CTM/37713/2001), Universidade de Aveiro and CICECO for the financial support provided.