Assemblies of four three-dimensional (3D) mixed-ligand coordination polymers (CPs) having formulas, {[Zn 2 (bdc) 2 (4-bpdh)]·C 2 H 5 OH·2H 2 O} n (1), [Zn(bdc)(4-bpdh)] n (2), {[Zn 2 (bdc) 2 (4-bpdh) 2 ]·(4-bpdh)} n (3), and {[Zn(bdc)(4-bpdh)]·C 2 H 5 OH} n (4) (bdc 2− = dianion of 1,4-benzenedicarboxylic acid, 4-bpdh = 2,5-bis(4-pyridyl)-3,4-diaza-2,4-hexadiene) have been synthesized and structurally characterized by single-crystal X-ray diffraction method. Structural determination reveals that the coordination numbers (geometry) of Zn(II) ions in 1, 2, 3, and 4 are five (distorted square-pyramidal (SP)), six (distorted octahedral (O h )), five (trigonal-bipyramidal (TBP)), and four (tetrahedral (T d )), respectively, and are bridged by 4-bpdh with bis-monodentate coordination mode and bdc 2− ligands with bis-bidentate in 1, chelating/bidentate in 2, bis-monodentate and bis-bidentate in 3, and bis-monodentate in 4, to generate two-fold interpenetrating 3D cube-like metal-organic framework (MOF) with pcu topology, non-interpenetrating 3D MOF, two-fold interpenetrating 3D rectangular-box-like MOF with pcu topology and five-fold interpenetrating diamondoid-like MOF with dia topology, respectively. These different intriguing architectures indicate that the coordination numbers and geometries of Zn(II) ions, coordination modes of bdc 2− ligand, and guest molecules play important roles in the construction of MOFs and the formation of the structural topologies and interpenetrations. Thermal stabilities, and photoluminescence study of 1-4 were also studied in detail. The complexes exhibit ligands based photoluminescence properties at room temperature.

A discrete complex [Zn(tpro)2(H2O)2] (1, Htpro = l-thioproline), and two structural isomers of coordination polymers, a 1D chain of [Zn(tpro)2]n (2) and a layered structure [Zn(tpro)2]n (3), were synthesized and characterized. The discrete complex 1 undergoes a temperature-driven structural transformation, leading to the formation of a 1D helical coordination polymer 2. Compound 3 is comprised of a 2D homochiral layer network with a (4,4) topology. These layers are mutually linked through hydrogen bonding interactions, resulting in the formation of a 3D network. When 1 is heated, it undergoes nearly complete conversion to the microcrystalline form, i.e., compound 2, which was confirmed by powder X-ray diffractions (PXRD). The carboxylate motifs could be activated after removing the coordinated water molecules by heating at temperatures of up to 150 °C, their orientations becoming distorted, after which, they attacked the activation sites of the Zn(II) centers, leading to the formation of a 1D helix. Moreover, a portion of the PXRD pattern of 1 was converted into the patterns corresponding to 2 and 3, and the ratio between 2 and 3 was precisely determined by the simulation study of in-situ synchrotron PXRD expriments. Consequently, such a 0D complex is capable of underdoing structural transformations and can be converted into 1D and/or 2D amino acid-based coordination polymers.

Poster Sessions automated data collection system. With this system, automatic sample exchange, centering, data collection and data processing are automatically carried out according to a user defined schedule. The construction of the beamline will be completed in the summer shutdown of PF-AR. The beamline commissioning will be finished by the end of March 2009. The first user operation is expected in April 2009. Here, we will present the general outline and current progress of this project.

A discrete complex [Zn(tpro) 2 (H 2 O) 2 ] (1, Htpro = L-thioproline), and two structural isomers of coordination polymers, a 1D chain of [Zn(tpro) 2 ] n (2) and a layer structure of [Zn(tpro) 2 ] n (3), have been synthesized and characterized. The discrete complex 1 undergoes a single-crystal to single-crystal temperature-driven structural transformation, leading to a 1D helical coordination polymer 2. Compound 3 has a 2D homochiral layer network with a (4,4) topology. These layers are mutually linked through hydrogen bonding interactions, resulting in the formation of a 3D network. When 1 was heated, it undergoes almost completely conversion to the microcrystalline of compound 2, which was confirmed by powder X-ray diffractions (PXRD). After removing the coordinated water molecules by heating at temperature of up to 150 C, the carboxylate motifs could be activated and their orientations became distorted, after which, they attacked the activation sites of the Zn(II) centers, leading to a the formation of a 1D helix. Moreover, a portion of the PXRD pattern of 3 was converted into a pattern for 2, and the ratio between 2 and 3 was precisely determined by the simulating study of the synchrotron in situ PXRD patterns. Consequently, such a 0D complex is capable of underdoing single-crystal to single-crystal transformations and can be converted into 1D and/or 2D amino acid-based coordination polymers.