Two-Dimensional Supramolecular Networks Generated from Weak Ag⋯C py Interactions: Synthesis, Structural, Thermal and Fluorescence Studies of Silver(I) Complexes of 5,5-Diethylbarbiturato with Pyridine-2-ylmethanol and 2,6-Dimethoxypyridine

Abstract

Two new silver(I) complexes [Ag(barb)(pym)]·H<inf>2</inf>O (1) and [Ag(barb)(dmpy)]·1.5H<inf>2</inf>O (2) (barb = 5,5-diethylbarbiturate, pym = pyridine-2-ylmethanol and dmpy = 2,6-dimethoxypyridine) have been synthesized and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffraction. In both complexes, the silver(I) ions are linearly coordinated by the N atoms of a barb anion and a pym or a dmpy ligand, forming mononuclear species. The molecules of 1 and 2 are doubly bridged by N-H⋯O hydrogen bonds involving the barb moieties and these hydrogen-bonded dimers are assembled into two-dimensional layered networks through weak Ag⋯C<inf>py</inf> (η1) interactions of ca. 3.3 Å. Additionally, the thermal and fluorescent properties of these complexes are also investigated. © 2009 Elsevier B.V. All rights reserved.