Syntheses, structures and photoluminescent properties of a series of Ag(i) coordination architectures based on 2,4-diamino-6-methyl-1,3,5-triazine and dicarboxylates: from a 0D discrete molecule to a 3D infinite network?

CrystEngComm Pub Date: 2011-08-24 DOI: 10.1039/C1CE05683B

Abstract

Five mixed-ligand Ag(I) coordination complexes (CCs), namely, [Ag2(dmt)2(suc)·H2O]n (1), [Ag2(dmt)2(suc)(H2O)·0.5H2O] (2), [Ag2(dmt)2(glu)]n (3), [Ag2(dmt)2(adip)]n (4), and [Ag2(dmt)2(tpa)]n (5) (dmt = 2,4-diamino-6-methyl-1,3,5-triazine, H2suc = succinic acid, H2glu = glutaric acid, H2adip = adipic acid, H2tpa = terephthalic acid), have been synthesized through a one-pot ultrasonic reaction of AgNO3, dmt and different dicarboxylates and characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. Complexes 1 and 2 formed in different solvent systems (methanol/acetonitrile for 1 and methanol/ethanol for 2) exhibit a two-dimensional (2D) sheet and a zero-dimensional (0D) tetranuclear motif, respectively. Different solvent systems influence the coordination modes (μ2-N,N′ for 1 and μ1-N for 2) of dmt and the conformations (anti for 1 and gauche for 2) of the suc anion; as a result, two diverse structures are produced. Complex 3 is a one-dimensional (1D) chain structure running along the a axis constructed from the [Ag2(μ1-dmt)2] subunit and the gauche–gauche μ5-η1:η1:η1:η2 glu ligand. Similarly, complex 4 is also a 1D chain structure, but the adip ligand adopts an anti–anti–anti conformation to link the [Ag2(μ1-dmt)2] subunit to complete the 1D chain. Complex 5 is a complicated 3D framework built from a tetrahedral Ag(I) center, a quadridentate tpa and an angular bidentate dmt ligand which can be simplified as a new (2,4,4)-connected 3-nodal net with the Schl?fli symbol of {4.84.12}2{42.82.102}{8}2. The results show that the dicarboxylate and the solvent system play crucial roles in the formation of the resulting structures. Additionally, results about thermogravimetric curves and photoluminescence spectra were discussed.

Graphical abstract: Syntheses, structures and photoluminescent properties of a series of Ag(i) coordination architectures based on 2,4-diamino-6-methyl-1,3,5-triazine and dicarboxylates: from a 0D discrete molecule to a 3D infinite network
Recommended Literature