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Three Cu(I)-cyanide coordination polymers based on trigonal 1,3,5-tris(1H-imidazol-1-yl)benzene (tib) ligand, namely [Cu 3 (CN) 3 (tib)] n ( 1 ), [Cu 4 (CN) 4 (tib)] n ( 2 ), and [Cu 2 (CN) 2 (tib)] n ( 3 ), have been prepared and characterized by elemental analysis, IR, PXRD, thermogravimetry and single-crystal X-ray diffraction analysis. Complex 1 displays a 3D metal-organic framework with nanosized pores. Complex 2 is a 3D coordination polymer assembled by three μ 2 -cyanides and a μ 3 -cyanide with a very short Cu(I)···Cu(I) metal bond(2.5206 Å). Complex 3 is a 2D coordination polymer constructing from 1D Cu(I)-cyanide zigzag chain and bidentate tib spacer. Three Cu(I) complexes are thermally stable up to 250–350 °C. Complexes 1 – 3 show similar orange emission band at 602 nm originating from LMCT mechanism. [ABSTRACT FROM AUTHOR]

Abstract: Hydrothermal reaction of CuCN with 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo) affords a wave-like infinite chain coordination polymer [Cu2(CN)2(3-bpo)] n (1). Replacement of 3-bpo by its isomer 2,5-bis(4-pyridyl)-1,3,4-oxadiazole (4-bpo) could yields polymer [Cu(CN)(4-bpo)] n (2). In the complex 1, the bent 3-bpo ligand adopts bidentate chelating mode binds with the Cu(I)-cyanide chain to form 16-membered macrocyclic structure. The complex 2 exhibits a layered metal–organic framework, in which exo-bidentate 4-bpo ligand connects the Cu(I)-cyanide chains to form 2-D rectangle grid. Both of these Cu(I) complexes are thermal stable under 200°C and release 3-bpo or 4-bpo ligand in 200–360°C. Luminescent study reveals that 1 has green-light emission, while 2 has blue-light emission. [Copyright &y& Elsevier]

Four unique complexes with diverse coordination architectures were synthesized upon complexation of 5,5-(1,4-phenylenebis (methylene))bis (oxy)- diisophthalic acid (H 4 L) with zinc ions by using different solvent. namely, {[Zn(H 2 L) (bpp)]·DEF} n ( 1 ), {[Zn 2 (L) (bpp) 2 ]·4H 2 O} n ( 2 ), {[Zn 2 (L) (pdp) 2 ]·3H 2 O·DEF} n ( 3 ), {[Zn 2 (L) (pdp) 2 ].4H 2 O} n ( 4 ). Complexes 1 , 2 and 3 , 4 are obtained by varying solvents to control their structures. The size of solvent molecular plays an important role to control different structure of these compounds. Compound 1 is 2D waved framework with (4, 4) grid layer as sql topology. Compound 3 displays a (4,6)-connected 2-nodal net with a fsc topology. Compounds 2 and 4 are all three-dimensional network simplified as (4,4)-connected 2-nodal net with a bbf topology. The photochemical properties of compounds 1 – 4 were tested in the solid state at room temperature, owing to their strong luminescent emissions, complexes 1 – 4 are good candidates for photoactive materials. [ABSTRACT FROM AUTHOR]

Abstract: Three new copper(II) azide coordination polymers with derivatives of 1,2,4-triazole as bridging coligands, namely [Cu2(admtrz)2(N3)4] n (1) (admtrz=4-amino-3,5-dimethyl-1,2,4-triazole), [Cu(4-abpt)(N3)2] n ·2nH2O (2) (4-abpt=4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole) and [Cu3(2-ptrz)2(N3)6] n (3) (2-ptrz=4-(2-pyridyl)-1,2,4-triazole), were prepared and characterized by elemental analyses, IR spectra and X-ray structural analyses. Compound 1 has a 1D chain structure in which Cu(II) ions are bridged by end-on (EO) azides and admtrz ligands. This compound contains three kinds of coordination modes for Cu(II) ions, including tetrahedral, square pyramidal and octahedral geometries. Compound 2 displays an interesting 3D framework structure, in which the azide ligands link Cu(II) ions in end-to-end (EE) mode affording a 2D square layer. This 2D layers are further bridged by bent 4-abpt ligands to form an interesting 3D framework. Furthermore, this structure also exhibits an alpha-Po net topology. Compound 3 displays a 1D rectangle-like chain structure linked by azides adopting end-on (EO) and end-to-end (EE) modes and 2-ptrz ligands. The IR and thermal stabilities of these coordination polymers 1–3 have also been studied. [Copyright &y& Elsevier]

Two new Cd(II) coordination polymers based on a flexible ligand 5-(bis(4- carboxybenzyl)amino)isophthalic acid (H 4 L) namely {[Cd 2 (L)(NMP) 2 (H 2 O) 2 ]·H 2 O} n (1) and{[Cd 4 (L) 2 (NMP) 2 (H 2 O)]∙2NMP} n (2) (NMP=N-methyl-2-pyrrolidone) have been prepared under hydrothermal conditions. Structural analyses revealed that 1 and 2 all exhibit three-dimensional network structures. Compound 1 shows 4-connect crb topology with [Cd 2 (CO 2) 4 ] as secondary building unit, while compound 2 can be regarded as a new 4,4,8-connect with a {411.615.82}{45.6}{46} topology with tetranuclear [Cd 4 (CO 2) 8 ]. By step-wise synthesis, tetranuclear cluster-based {[Cd 4 (L) 2 (NMP) 2 (H 2 O)]∙2NMP} n (2) can be synthesized successfully by using compound 1. The powder X-ray diffraction, the thermal stabilities, and solid-state luminescence properties of compounds 1 – 2 have also been investigated. Two 3D Cd coordination polymers with different topology were synthesized successfully. By step-wise synthesis, binuclear-cluster units can be transferred to tetranuclear cluster. Image 1 • Achieving the structure transformation from binuclear units to tetranuclear units by employing a step-wise synthesis method. • Two cadmium coordination polymers have been synthesized by using flexibly carboxylic ligand. • A new topology with 4,4,8-connected 3-nodal net. [ABSTRACT FROM AUTHOR]