A one-dimensional coordination polymer of copper(II) with 2-pyrazine­carboxyl­ate

A new one-dimensional coordination polymer, catena-poly­[[aqua­(nitrato-κ²O,O′)copper(II)]-μ-pyrazine-2-carboxyl­ato- κ³N¹,O:N⁴], [Cu(C₅H₃N₂O₂)(NO₃)(H₂O)]_n, has been synthesized and characterized. The coordination environment of the copper(II) ion is distorted octahedral, arising from an N,O-bidentate 2-pyrazine­carboxyl­ate ligand, an N atom from a symmetry-related 2-pyrazine­carboxyl­ate ligand, a bidentate nitrate group and a water mol­ecule. The chains interact by way of O—H...O hydrogen bonds and C—H...O interactions.

Bis[tetra­aqua­(1,10-phenanthroline-κ²N,N′)cobalt(II)] 1,2,4,5-benzene­tetra­carboxyl­ate

The title compound, [Co(C₁₂H₈N₂)(H₂O)₄]₂(C₁₀H₂O₈), consists of discrete tetra­aqua­(1,10-phenanthroline)cobalt(II) cations and 1,2,4,5-benzene­tetra­carboxyl­ate anions. The Co^II atom is octa­hedrally coordinated by two N atoms of the 1,10-phenanthroline ligand and four O atoms of water mol­ecules. The anion lies on an inversion centre. A two-dimensional hydrogen-bonding network is formed by O atoms of benzene­tetra­carboxyl­ate and the coordinated water mol­ecules.

3,3,4,4,5,5-Hexafluoro-1,2-bis­{3-methyl-5-[3-(trifluoro­meth­yl)phen­yl]-2-thien­yl}cyclo­pent-1-ene

The title compound, C₂₉H₁₆F₁₂S₂, a photochromic dithienyl­ethene, is a potential material for optical storage. It adopts a photo-active antiparallel conformation in the single crystalline phase. The distance between the two reactive C atoms is 3.624 (8) Å. The mol­ecule has crystallographic twofold rotation symmetry. The dihedral angles between the cyclo­pentene ring and the attached thio­phene and benzene rings are 47.2 (2) and 17.9 (2)°, respectively.