Wen-Xin Du

The Structure and Fluorescence Properties of Two Novel Mixed-Ligand Supramolecular Frameworks with Different Structural Motifs

Two novel coordination polymers formed by cobalt nitrate and 1,2-bis(4-pyridyl)ethane with the homologous ligands 2-aminoterephthalic acid and terephthalic acid, respectively, have been prepared. One displays a fivefold diamond-type feature while the other exhibits a twofold interpenetrating structural motif. The thermal and photoluminescence properties associated with their structures have been characterized and studied. (© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)

Synthesis and Characterization of a Series of Novel Heptanuclear Trigonal‐Prismatic Polyhedra with Different Edge‐Ligands

Five novel heptanuclear trigonal-prismatic polyhedra, Na4[PrNi6(Gly)9(mu 3-OH)3(H2O)6].(ClO4)7 (1), Na2[PrNi6(Gly)8(mu 3-OH)3(mu 2-OH2)-(H2O)6].(ClO4)6.(H2O)2 (2), Na[DyNi6(Gly)7(mu 3-OH)3(mu 2-OH2)2(H2O)6].(ClO4)6.H2O (3), [SmNi6(Gly)6-(mu 3-OH)3Cl3(H2O)6].Cl3.(H2O)9 (4), and [ErNi6(Gly)6(mu 3-OH)3Cl3(H2O)6].Cl3.(H2O)9 (5), were synthesized through self-assembly and characterized by X-ray structure analysis. Complex 1 crystallizes in the trigonal P3 space group (a = b = 18.1121(2), c = 11.987(0) A, and Z = 2). Complex 2 belongs to the triclinic P1 space group (a = 16.0145(3), b = 20.58650(10), c = 20.8452(3) A, alpha = 78.0590(10), beta = 67.9200(10), gamma = 68.1540(10) degrees, and Z = 4). Complex 3 belongs to the monoclinic P2(1)/m space group (a = 14.9863(3), b = 13.533, c = 15.6171(3) A, beta = 116.8970(10) degrees, and Z = 2). Complexes 4 and 5 are isomorphous (4: trigonal, P3; a = b = 11.8661(4), c = 18.2034(10) A, Z = 2; 5: a = b = 11.9001(5), c = 18.1229(11) A, Z = 2). A Ln3+ ion is in the center of the prism formed by six nickel atoms. It coordinates to nine oxygen atoms. Its coordination polyhedron may be best described as a tricapped trigonal prism. The five complexes all have a core of [LnNi6(Gly)6-(mu 3-OH)3(H2O)6]6+ and were obtained through the edge-ligand exchange of the three mu 2-OH2 ligands of [LnNi6(Gly)6-(mu 3-OH)3(H2O)6(mu 2-OH2)3]6+ partly or wholly by glycine or Cl-. Magnetic measurements reveal that 1 and 4 exhibit antiferromagnetic interaction, while 5 exhibits a ferromagnetic interaction.

A novel mixed-ligand molecular bilayer generated by self-assembly of “T-shaped” moieties, displaying an unusual entanglement

The reaction of silver nitrate with 4,4′-biphenyldicarboxylate and 1,2-bis(4-pyridyl)ethane under hydrothermal conditions gives an interesting 2D bilayer containing a new kind of “T-shaped” unit. Each of these 2D frames is interlocked with the neighboring layers to form an overall three-dimensional architecture, displaying an unprecedented entanglement.

A novel 2D bilayer architecture generated viaπ-π interactions and host–guest molecular recognition: assembly and structure of {[Cd(Htma)(bpy)(H2O)]·(H2tp)0.5·2H2O}n polymer (tma = trimesate, bpy = 4,4′-bipyridine, tp = terephthalate)

The interdigitation of the lateral tma ligands from two adjacent 44 nets via aromatic π-π interactions and host–guest molecular recognition gives rise to a novel 2D bilayer supramolecular architecture formed by the {[Cd(Htma)(bpy)(H2O)]·(H2tp)0.5·2H2O}n polymer. An interested parallel/parallel interpenetration of the 44 net appears in this bilayer supramolecular architecture through other 2D H-bonded 44 nets formed by tma molecules that H-bond with water molecules. This compound, obtained from a hydrothermal reaction, crystallizes in the triclinic P-1 space group and exhibits a broad intense fluorescent emission upon photoexcitation at 311 nm.

Synthesis, structure and fluorescence of a 3-D polymer {(Mo4O12)(4,4′-bipy)2}n

Abstract We report the synthesis, single-crystal X-ray structure, IR, TGA–DTA and fluorescence of a black MOF crystal {(Mo4O12)(4,4′-bipy)2}n, which has two channels. One channel along the [001] direction was formed by a metaloxygen octatomic ring and the another one along the [010] direction was shaped by 4′4-bipy.

Two new coordination host frameworks for the inclusion of 4-amino-benzophenone guest molecules

Abstract The synthesis and structural characterization of novel organometallic coordination polymers are reported. The reaction of Cd(NO3)2 and 4,4′-bipy in CH3OH/H2O gave a 2D coordination network formulated as {[Cd(4,4′-bpy)2·(H2O)2](NO3)2·4H2O}10, which was used to capture an organic guest species (4-amino-benezopheone, C13H11NO (3)) to obtain {[Cd(4,4′-bpy)2(NO3)(H2O)]·NO3·(C13H11NO)2} (1). Using L (L=4,4′-trimethylenedipyridine) instead of 4,4′-bipy, {[Cd(L)2(H2O)2]·2H2O·2NO3·C13H11NO} (2) was synthesized, which has an interesting configuration.

Crystal structures of five transition-metal 1,4-butylenediphosphonates

Abstract The structures of five transition-metal 1,4-butylenediphosphonates: [{Co(H2O)6} {HO3P(CH2)4PO3H}·2H2O] (1), [{Ni(H2O)6}{HO3P(CH2)4PO3H}·2H2O] (2), [{Cu(H2O)2}{HO3P(CH2)4PO3H}]n (3), [Zn{HO3P(CH2)4PO3H}·2H2O]n (4) and [{Cu2(H2O)2}{O3P(CH2)4PO3}·H2O]n (5) have been determined by single crystal X-ray diffraction. The structures are diverse, including zero-dimensional, chain-like and three-dimensional framework types.

Single crystal structure of a heterometallic one-dimensional polymer: [{Cu(1,10-phen)}2(V2O4)(O3PCH2CH2CH2CH2PO3H)2(H2O)]n

Abstract A heterometallic one-dimensional polymer [{Cu(1,10-phen)}2(V2O4)(O3PCH2CH2CH2CH2PO3H)2(H2O)]n 1 (1,10-phen=1,10-phenanthroline) has been synthesized under hydrothermal conditions. The structure of 1 shows a stepped chain with two parallel 1,4-butylenediphosphonate ligands as linking units.

Single crystal structure of a two-dimensional framework: [{Co(4,4′-bpy)(HO3PCH2CH2CH2CH2PO3H)(H2O)2}·4H2O]n

Abstract The structure of [{Co(4,4 ′ -bpy)(HO 3 PCH 2 CH 2 CH 2 CH 2 PO 3 H)(H 2 O) 2 }·4H 2 O] n 1 was determined by single crystal X-ray diffraction. Compound 1 contains a new two-dimensional framework layer, which is built up from parallelogram units in bc plane. The layers are constructed into a three-dimensional structure by interlayer hydrogen bonds.

Syntheses and characterization of two dodecanuclear heterobimetallic MoCuS cage clusters: [NEt4]2[(Mo2Cu2S2O2edt2)3(μ6-Se2)]·CH2Cl2 and [NEt4]2[(Mo2Cu2S2O2edt2)3(μ6-S)]·3H2O (edt=−SC2H4S−).

Abstract The reaction of Se2 or S2− with the [MoS2O2(S2C2H4)2]2−/2Cu+ yielded two novel dodecanuclear interstitial clusters having the general formula [NEt4]2[(Mo2Cu2S2O2edt2)3(μ6-Se2)]·CH2Cl2 (1) and [NEt4]2[(Mo2Cu2S2O2edt2)3(μ6-S)]·3H2O (2) (edt=−SC2H4S−), whose crystal structures were determined by X-ray crystallography. The anions in 1 and 2 can be viewed as a cage consisting of three [MoS2O2 (S2C2H4)2]2−/2Cu+ fragments, with an Se22− or an S2− at the center, respectively.