Study of the tunable structure and two-dimension correlation infrared spectroscopy of Gd/3-methylbenzoic acid with o-phenanthroline, 2,2′-and 4,4′-bipyridines

Three rare earth compounds with 3-methylbenzoic acid (HMeBA) have been hydrothermally synthesized directly: Gd-2(MeBA)(6)(o-Phen)(2) 1 (o-Phen = o-phenanthroline), [Gd-2(MeBA)(6)(2,2'-bpy)](n), 2 (2,2'-bpy = 2,2'-bipyridine) and Gd (MeBA)(3)center dot(4,4'-bpy)(0.5) 3 (4,4'-bpy = 4,4'-bipyridine). These crystal structures were determined by single-crystal X-ray diffraction with the following data: 1: monoclinic, Cc; 2: monoclinic, P2(1)/n; 3: Triclinic, P - 1. The compound 1 is a zero-dimensional Bi-nuclear oligomer and ligand -o-phenanthroline participates in the coordination; the compound 2 is a one-dimensional chain and the second ligand -2,2'-bpy participates in coordinating with the Gd ion; in particular, due to the existence of the second ligand -4,4'-bpy which acts as the bridge, the compound 3 is the two-dimensional layer. Additionally, in order to explore the structural characteristic, photo-luminescent and the 2D-IR correlation spectroscopy containing the temperature-induced structural variations and magnetism-induced structural variations are used. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.