名称:
Radius-dependent assembly of complexes with the rigid unsymmetric ligand 5-(2-pyridyl)-1,3,4-oxadiazole-2-thione: Syntheses, structures and luminescence properties
摘要:
The free ligand, 5-(2-pyridyl)-1,3,4-oxadiazole-2-thione (1, HL5), has been synthesized and characterized; its three new functional d1o transition-metal complexes, [Zn(L5)(2)(H2O)(2)] (2), [Cd(L5)2](n) (3) and [Hg-2(L5)(4)] (4), have been successfully obtained by a diffusion synthetic method and characterized by single-crystal X-ray diffraction, infrared spectroscopy, elemental analysis, thermogravimetric analysis, and photoluminescence. On the basis of the X-ray analyses, the radii of the metal ions are found to play an important role in determining the structures. The radii and nature of the metal ions can impart their influence on the coordination geometry of the d(10) transition-metal atoms, which seems to be the main factor controlling the structures and luminescent properties of the reaction products in this system. (c) 2007 Elsevier Ltd. All rights reserved.