Hong-Jun Hao

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

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 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.

Syntheses, structures and fluorescence of two coordination complexes of Zn(II) and 1,3-bis(2-methylimidazolyl)propane: solvent effect

Two Zn(II) coordination complexes, formulated as [Zn2(bmip)(tpa)2·2DMF]n (1) and [Zn(bmip)(tpa)·3H2O]n (2) (bmip = 1,3-bis(2-methylimidazolyl)propane, H2tpa = terephthalic acid, DMF = N,N-dimethylformamide) have been prepared by ultrasonic reactions of the flexible ligand bmip and aromatic dicarboxylic acid H2tpa with Zn(II) ions in various solvent systems. Both of these complexes have been characterized by elemental analyses, IR spectra, and single-crystal X-ray diffraction. As controlled by solvent systems, complex 1 is a 2-fold interpenetrating 3D framework with α-Po network topology, while, complex 2 reveals a 3-fold interpenetrating 3D framework with dia topology. Furthermore, the photoluminescence at room temperature and thermogravimetric properties of the complexes 1 and 2 were also investigated in the solid state.

3D -> 3D interpenetrated and 2D -> 3D polycatenated Ag(I) networks constructed from 1,4-bis(2-methylimidazol-1-ylmethyl)benzene and dicarboxylates

Two novel entangled Ag(I) metal–organic frameworks (MOFs), namely [Ag2(bmimb)1.5(pzdc)·3H2O]n (1) and [Ag(bmimb)(mac)0.5·0.5H2O]n (2) (bmimb = 1,4-bis(2-methylimidazol-1-ylmethyl)benzene, H2pzdc = pyrazine-2,3-dicarboxylic acid, H2mac = L-malic acid), exhibit 3D → 3D interpenetrated and 2D → 3D polycatenated motifs, respectively, which were modulated by auxiliary dicarboxylates. Moreover, the UV-Vis spectra, thermal stabilities and photoluminescent properties were also discussed.

CCDC 827639: Experimental Crystal Structure Determination

Related Article: Di Sun, Yun-Hua Li, Hong-Jun Hao, Fu-Jing Liu, Yi-Mei Wen, Rong-Bin Huang, Lan-Sun Zheng|2011|Cryst.Growth Des.|11|3323|doi:10.1021/cg2006953

CCDC 823092: Experimental Crystal Structure Determination

Related Article: Di Sun, Fu-Jing Liu, Hong-Jun Hao, Yun-Hua Li, Na Zhang, Rong-Bin Huang, Lan-Sun Zheng|2011|CrystEngComm|13|5661|doi:10.1039/c1ce05622k

CCDC 823094: Experimental Crystal Structure Determination

Related Article: Di Sun, Fu-Jing Liu, Hong-Jun Hao, Yun-Hua Li, Na Zhang, Rong-Bin Huang, Lan-Sun Zheng|2011|CrystEngComm|13|5661|doi:10.1039/c1ce05622k