Effect of Aggregation of Acridine Orange on the Luminescent Characteristics of Its Composites with a Zinc-Containing Coordination Polymer

Abstract

acridine orange depends on the ratio of the amounts of aggregated and isolated molecules of the dye, which in turn depends on the conditions under which the composites are produced. In all cases energy is transferred from the coordinated polymer to the dye, leading to bimodal luminescence in the composites.The coordination polymers (CPs) formed by metal ions and polydentate organic bridging ligands (linkers) have attracted much interest in recent decades on account of their specific sorption, magnetic, optical, and catalytic characteristics and their associated potential use for possible applications in various fields [1][2][3][4]. The almost unlimited set of metal-containing units and bridging ligands that can be used today for the construction of CPs opens up wide possibilities for varying the properties of the materials. On account of the thermal stability, kinetic inertness, and tetragonal structure of the coordination polyhedra [5] the complexes of metals with tetradentate aza macrocyclic ligands present a promising class of metal-containing building blocks that retain their identity in the processes involved in the formation of coordination-polymer chains and are characterized by predictable linear bimodality arising from the presence of two vacant positions in the coordination sphere of the metal. At the present time a considerable number of CPs formed by aza macrocyclic complexes have been described, and most of them contain aromatic carboxylates as linkers [6,7]. As a rule these linkers only play an architectural role in the spatial organization of the metal-containing building blocks in the polymeric networks without involvement of their inner properties in the functional behavior of the materials.One of the important factors that make it possible to use the properties of bridging aromatic carboxylates for practical purposes is their luminescent behavior. In particular, it was established that CPs formed by the ions of non-transition metals or 0040-5760/15/5104-0259 ©2015 Springer Science+Business Media New York 259 ________ 1 L.