A luminescent cadmium itaconate coordination polymer with rare 658 layer topology from in situ hydrothermal decarboxylation of trans-aconitic acid

Crystal structure of 4-nitro-thiophene-2-carboxylic acid, a structure with a Z′ = 4, C5H3NO4S

C5H3NO4S, monoclinic, P21/c, a = 11.7169(18) Å, b = 8.2671(12) Å, c = 28.478(4) Å, β = 93.396(2)°, Z = 16, F(000) = 1408, V = 2753.6(7) Å3, R gt (F) = 0.039, wR ref (F 2 ) = 0.107, T = 296 K.

Crystal structure of catena-poly[[[tetra-aqua-zinc(II)]-μ-1,4-bis-[4-(1H-imidazol-1-yl)benzo-yl]piperazine] dinitrate monohydrate]

In the title polymeric complex, {[Zn(C₂₄H₂₂N₆O₂)(H₂O)₄](NO₃)₂·2H₂O}_n, the Zn^II cation, located about a twofold rotation axis, is coordinated by two imidazole groups and four water mol­ecules in a distorted N₂O₄ octa­hedral geometry; among the four coordinate water mol­ecules, two are located on the same twofold rotation axis. The 1,4-bis­[4-(1H-imidazol-1-yl)benzo­yl]piperazine] ligand is centro-symmetric, with the centroid of the piperazine ring located on an inversion center, and bridges the Zn^II cations, forming polymeric chains propagating along [201]. In the crystal, O—H⋯O and weak C—H⋯O hydrogen bonds link the polymeric chains, nitrate anions and solvent water mol­ecules into a three-dimensional supra­molecular architecture. A short O⋯O contact of 2.823 (13) Å is observed between neighboring nitrate anions.

Crystal engineering of cadmium coordination polymers decorated with nitro-functionalized thiophene-2,5-dicarboxylate and structurally related bis(imidazole) ligands with varying flexibility

Five bis(imidazole) ligand modulated cadmium coordination polymers based on a new nitro-functionalized thiophene-2,5-dicarboxylate ligand or 4-nitro-thiophene-2-carboxylic acid involving in situ ligand synthesis.