Construction of Cd/Zn(II)-1,2,4-Triazolate Coordination Complexes via Changing Substituents and Anions

Abstract

A series of zero-to three-dimensional Cd/Zn(II)-1,2,4-triazolate coordination complexes have been obtained by changing the anions and the substituents on the triazole ring. Cd 2 (2-pytrz) 2 Cl 4 (1) and Cd 3 (dpatrz) 4 Cl 6 (2) (2-pytrz ) 3,5-di(pyrid-2-yl)-1,2,4triazole and dpatrz ) 3,5-di(n-propyl)-4-amino-1,2,4-triazole) have discrete binuclear and trinuclear structures, respectively. Cd 3 (atrz) 4 Cl 6 (3) and Cd(atrz) 2 (SCN) 2 (4) (atrz ) 4-amino-1,2,4-triazole) are polymeric 1D chains constructed from trinuclear cadmium units and mononuclear cores. Cd(datrz)I ( 5), Zn(dmtrz)Cl ( 6), and Cd 3 (dmatrz) 4 (N 3 ) 6 (7) (datrz ) 3,5-diamino-1,2,4-triazole, dmtrz ) 3,5-dimethyl-1,2,4-triazole, and dmatrz ) 3,5-dimethyl-4-amino-1,2,4-triazole) all show two-dimensional layer structures. Complexes 5 and 6 are 2D grids based on binuclear clusters and present (4.8 2 ) metal (4.8 2 ) trz topology. Complex 7 is of 2D (4,4) topology when trinuclear cadmium units are regarded as four-connected nodes. For complexes 1-7, weak hydrogen-bonding contacts link the discrete polynuclear clusters, 1D chains, or 2D layers to form three-dimensional supramolecular structures. Zn 2 (trz) 3 Cl (8) (trz ) 1,2,4-triazole) presents an interesting 3D network based on three nonequivalent nodes and has a (4 6 8 6 12 24 )(8 6 12 54 )(4 2 8 4 12 36 ) 3 topology. Complexes 1-8 all exhibit strong blue fluorescence emission bands in the solid state at ambient temperature.

A novel CdII coordination polymer with helical units and mix-connected network topology constructed form 2-propyl-4,5-imidazoledicarboxylate and N-donor co-ligands

“…To understand the nature of the emission bands, we analyzed the photoluminescence properties of the free ligands, and found that H 3 pimdc and bpp ligands exhibit emission bands at 488 nm (k ex = 398 nm) and 521 nm (k ex = 398 nm) [30,31], respectively. Therefore, the emissions of 1 can tentatively be assigned to intraligand fluorescence emission [32][33][34][35][36]. A similar emission band at 431 nm for [Cd 2 (l-tp) 2 (l-bpp) 3 ] n Á2nH 2 O (H 2 tp = terephthalic acid) has been observed recently [31].…”

Crystal structure of diaqua[1,2-di(pyridin-4-yl)ethene]-bis[2,2'- oxydibenzoato]dicadmium(II), Cd2(H2O)2(C12H10N2)(C14H8O5)2

“…In addition, Cd II ion is afavorable and fashionable building block or connecting node, not only because it easily coordinates N/O-containing ligands, but also becausethe closed-shell d 10 CdCd interaction can often give rise to intriguing supramolecular motifs and properties [4,5]. In the crystal structure of the title compound, the asymmetric unit contains one Cd(II) atom, one water molecule, one 2,2'-oxydibenzoate (odb) ligand and one half molecule of the 1,2-di(pyridin-4-yl)ethene (dpe) with an inversion centre at the midpoint of the central C=C bond.…”

“…In the crystal structure of the title compound, the asymmetric unit contains one Cd(II) atom, one water molecule, one 2,2'-oxydibenzoate (odb) ligand and one half molecule of the 1,2-di(pyridin-4-yl)ethene (dpe) with an inversion centre at the midpoint of the central C=C bond. The Cd1 site shows aseriously distorted octahedral coordination CdNO 5 …”

A new 3D supramolecular architecture constructed from the overlapping of ladder-like 1,2,4-triazole-bridging Ag(I) chains

“…422 and 442 nm excited at 361 nm. Compared to similar ligand 3,5-di(pyrid-2-yl)-1,2,4-triazole (emission at 421 nm with a weak one around 440 nm excited at 357 nm), the emission peaks should originate from the p-p * intraligand transition of aptr [15]. The peak at 422 nm may come from the transition of 1,2,4-triazole ring with .…”