New Cu^II and Cd^II Metal‐organic Coordination Polymers with 1,2,4‐triazolo[3,4‐b]‐1,3,4‐thiadiazole Ligands: Syntheses, Structures and Luminescent Properties

Abstract

Three new complexes {[Cu(L 1 ) 2 (NO 3 ) 2 ]·H 2 O} ¥ (1), {[Cu 4 (L 2 ) 2 (OAc) 8 ]×CH 3 CH 2 OH} ¥ (2) and [Cd 2 (L 3 ) 3 (NO 3 ) 4 (H 2 O) 2 ] ¥ (3) (L 1 = 4-phenyl-7-(pyridine-3-yl)-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole, L 2 = 4-(pyridine-3-yl)-7-phenyl-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole, and L 3 = 4-(pyridine-4-yl)-7-phenyl-1,2,4-triazolo[3,4-b]-1,3,4-thiadiazole) have been synthesized and characterized by elemental analyses, IR spectra and single crystal X-ray diffraction. The structural analyses reveal that complex 1 is a neutral 2-D network structure with a 4 4 topology, 2 has a 1-D neutral coordination chain with a [Cu 2 (CH 3 COO) 4 ] dinuclear structural unit bridged by four acetate ions, and 3 is a neutral rhombohedral grid structure. All the complexes are air stable at room temperature. Furthermore, the fluorescent properties of complex 3 and corresponding ligand L 3 have been investigated and discussed. Scheme 1 The structure of ligands L 1 -L 3 Scheme 2 The route of synthesis of ligands L 1 -L 3 CHEMICAL SOCIETY Fig. 1. View of (a) the coordination environment of Cu II ions in 1. (b) 2-D (4,4) network structure of 1 (H atoms are omitted for clarity). (c) 4 4 topology of 1. 790 www.jccs.wiley-vch.de

Thiazole- and Thiadiazole-Based Metal–Organic Frameworks and Coordination Polymers for Luminescent Applications

“…In 2015, Wang and collaborators (Urumqi, CHN) reported on the synthesis of Cu(II) and Cd(II) CPs with different dimensionality (either 1D chains or 2D sheets) built with the 1,3,4-thiadiazole-containing isomeric linkers L 1 , L 2 and L 3 (Scheme 3) [76]. The emission spectra of L 3 and its Cd(II) 2D polymer [Cd 2 (L 3 ) 3 (NO 3 ) 4 (H 2 O) 2 ]∞ in the solid state at room temperature were investigated.…”

“…L 3 exhibits a weak blue fluorescent emission band around 410 nm upon excitation at 350 nm, while the Cd(II) polymer exhibits an intense blue fluorescent emission band around 465 nm. In 2015, Wang and collaborators (Urumqi, CHN) reported on the synthesis of Cu(II) and Cd(II) CPs with different dimensionality (either 1D chains or 2D sheets) built with the 1,3,4-thiadiazolecontaining isomeric linkers L 1 , L 2 and L 3 (Scheme 3) [76]. The emission spectra of L 3 [77].…”