Poly[[{μ₄-2,2′-[butane-1,4-diylbis(sulfanedi­yl)]bis­(1,3,4-thia­diazole)}silver(I)] perchlorate sesquihydrate]

In the polymeric title compound, {[Ag(C₈H₁₀N₄S₄)]ClO₄·1.5H₂O}_n, the Ag^I atom has a slightly distorted trigonal-planar coordination geometry provided by three N-atom donors from the thia­diazole rings of three symmetry-related 2,2′-[butane-1,4-diylbis(sulfanedi­yl)]bis­(1,3,4-thia­diazole) ligands. Centrosymmetrically related Ag^I atoms are bridged by the N–N fragments of rings, forming six-membered dinuclear metallacycles, which are further linked by the alkyl spacers of the thia­diazole ligands into a layer network extending parallel to (0-21). The crystal structure is stabilized by inter­molecular O—H...O hydrogen bonds. The O atoms of the perchlorate anion and one water mol­ecule are disordered over two sets of sites with refined occupancy ratios of 0.640 (6):0.360 (6) and 0.663 (11):0.337 (11), respectively. The second water molecule shows half-occupancy.

Poly[tetra­aqua­bis­(μ₄-thio­phene-2,5-dicarboxyl­ato)(μ₂-thio­phene-2,5-dicarboxyl­ato)dieuropium(III)]

The three-dimensional coordination polymer, [Eu₂(C₆H₂O₄S)₃(H₂O)₄]_n, has been synthesized under hydro­thermal conditions. The asymmetric unit comprises one Eu³⁺ cation, two aqua ligands and one and a half thiophene-2,5-dicarboxylate anions (the half-anion being completed by a twofold rotation axis). The Eu³⁺ cation is eight-coordinated in a distorted dodeca­hedral geometry. The crystal structure features O—H...O hydrogen bonds.

(E)-1-Nitro-2-(2-nitro­prop-1-en­yl)benzene

The title compound, C₉H₈N₂O₄, adopts an E conformation about the C=C bond. The CH_phen­yl—C_phen­yl—CH—C(—NO₂) torsion angle is −57.7 (3)°. The crystal structure features weak inter­molecular C—H...O inter­actions.