Syntheses, structures and luminescence of Europium alpha-thiophene carboxylates coordination polymer and supramolecular compound

摘要

Two europium a-thiophene carboxylic acid (HTPA) compounds, coordination polymer Eu(TPA)(3)(HTPA)(2) (1) (TPA = alpha-thiophene carboxylate) and supramolecular compound Eu(TPA)(3)(H2O)(3)(.)0.5H(2)O (2) with luminescence and triboluminescence, have been synthesized and structurally characterized. In I each europium is bridged by six oxygen atoms from six carboxylates and coordinated with two carboxyl oxygen atoms from two alpha-thiophene carboxylic acid molecules, resulting in a coordination number of eight to Eu. For 2 each europium is chelated by six oxygen atoms from six carboxylates and coordinated with three oxygen atoms from three coordinated water generating a coordination number nine to Eu; A supramolecular compound is constructed through hydrogen bonds. Both I and 2 display strong characteristic emission of Eu3+ ion radiated by UV light and produce twinkling red light with an external force. (C) 2003 Elsevier B.V. All rights reserved. [References: 13]