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

• Published in: CrystEngComm 2011-01, Vol.13 (21), p.6431-6441
• Main Authors: Sun, Di, Li, Yun-Hua, Hao, Hong-Jun, Liu, Fu-Jing, Zhao, Yang, Huang, Rong-Bin, Zheng, Lan-Sun
• Format: Article
• Language: English
• Subjects: Chains; Ethyl alcohol; Ligands; Methyl alcohol; Molecular conformation; Photoluminescence; Solvents; Three dimensional
• ISSN: 1466-8033; 1466-8033
• DOI: 10.1039/c1ce05683b

Five mixed-ligand Ag(i) coordination complexes (CCs), namely, [Ag2(dmt)2(suc)[middle dot]H2O]n (1), [Ag2(dmt)2(suc)(H2O)[middle dot]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 ([small mu ]2-N,N[prime or minute] for 1 and [small mu ]1-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([small mu ]1-dmt)2] subunit and the gauche-gauche [small mu ]5-[small eta]1:[small eta]1:[small eta]1:[small eta]2 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([small mu ]1-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 Schlafli 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.