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A Cu II coordination polymer, catena -poly[[[aqua-copper(II)]-bis-(μ-4-amino-benz-o-ato)-κ 2 N : O ;κ 2 O : N ] monohydrate], {[Cu( p ABA) 2 (H 2 O)]·H 2 O} n ( p ABA = p -amino-benzoate, C 7 H 4 NO 2 - ), was synthesized and characterized. It exhibits a one-dimensional chain structure extended into a three-dimensional supra-molecular assembly through hydrogen bonds and π-π inter-actions. While the twinned crystal shows a metrically ortho-rhom-bic lattice and an apparent space group Pbcm , the true symmetry is monoclinic (space group P 2/ c ), with disordered Cu atoms and mixed roles of water mol-ecules (aqua ligand/crystallization water). The luminescence spectrum of the complex shows an emission at 345 nm, cf. 349 nm for p ABAH., (© Gogia et al. 2024.)

Copper(I) iodide complexes are well known for displaying a diverse array of structural features even when only small changes in ligand design are made. This structural diversity is well displayed by five copper(I) iodide compounds reported here with closely related piperidine-2,6-di-thione (SNS), isoindoline-1,3-di-thione (SNS6), and 6-thioxopiperidin-2-one (SNO) ligands: di-μ-iodido-bis-[(aceto-nitrile-κ N )(6-sulfanylidenepiperidin-2-one-κ S )copper(I)], [Cu 2 I 2 (CH 3 CN) 2 (C 5 H 7 NOS) 2 ] ( I ), bis-(aceto-nitrile-κ N )tetra-μ 3 -iodido-bis-(6-sulfanylidenepiperidin-2-one-κ S )- tetra-hedro -tetra-copper(I), [Cu 4 I 4 (CH 3 CN) 4 (C 5 H 7 NOS) 4 ] ( II ), catena -poly[[(μ-6-sulfanylidenepiperidin-2-one-κ 2 O : S )copper(I)]-μ 3 -iodido], [CuI(C 5 H 7 NOS)] n ( III ), poly[[(piperidine-2,6-di-thione-κ S )copper(I)]-μ 3 -iodido], [CuI(C 5 H 7 NS 2 )] n ( IV ), and poly[[(μ-isoindoline-1,3-di-thione-κ 2 S : S )copper(I)]-μ 3 -iodido], [CuI(C 8 H 5 NS 2 )] n ( V ). Compounds I and II crystallize as discrete dimeric and tetra-meric complexes, whereas III , IV , and V crystallize as polymeric two-dimensional sheets. To the best of our knowledge, compound III is the first instance of an extended hexa-gonal [Cu 3 I 3 ] structure that is not supported by bridging ligands. Structures I , II , and IV display weak to moderately strong Cu⋯Cu cuprophilic inter-actions [Cu⋯Cu inter-nuclear distances range between 2.5803 (10) and 2.8485 (14) Å]. All structures except III display weak hydrogen-bonding inter-actions between the N-H of the ligand and the μ 2 and μ 3 -I - atoms. Structure III contains classical N-H⋯O inter-actions between the SNO ligands that connect the mol-ecules in a three-dimensional framework. Complex V features π-π stacking inter-actions between the aryl rings of the SNS6 ligands within the same polymeric sheet. In structure IV , there were three partially occupied solvent mol-ecules of di-chloro-methane and one partially occupied mol-ecule of aceto-nitrile present in the asymmetric unit. The SQUEEZE routine [Spek (2015 ▸). Acta Cryst . C 71 , 9-18] was used to correct the diffraction data for diffuse scattering effects and to identify the solvent mol-ecules. The given chemical formula and other crystal data do not take into account the solvent mol-ecules., (© Wheaton et al. 2020.)

The structures of two facially coordinated Group VII metal complexes are reported, namely: fac -bromido-[2-(2,2'-bipyridin-6-yl)benzoic acid-κ 2 N , N ']tricarbonyl-manganese(I) tetra-hydro-furan monosolvate, [MnBr(C 17 H 12 N 2 O 2 )(CO) 3 ]·C 4 H 8 O, I , and fac -[2-(2,2'-bipyridin-6-yl)benzoic acid-κ 2 N , N ']tricarbonyl-chlorido-rhenium(I) tetra-hydro-furan monosolvate, [ReCl(C 17 H 12 N 2 O 2 )(CO) 3 ]·C 4 H 8 O, II . In both complexes, the metal ion is coordinated by three carbonyl ligands, a halide ion, and a 2-(2,2'-bipyridin-6-yl)benzoic acid ligand, in a distorted octa-hedral geometry. In manganese complex I , the tetra-hydro-furan (THF) solvent mol-ecule could not be refined due to disorder. The benzoic acid fragment is also disordered over two positions, such that the carb-oxy-lic acid group is either positioned near to the bromide ligand or to the axial carbonyl ligand. In the crystal of I , the complex mol-ecules are linked by a pair of C-H⋯Br hydrogen bonds, forming inversion dimers that stack up the a -axis direction. In the rhenium complex II , there is hydrogen bonding between the benzoic acid moiety and a disordered co-crystallized THF mol-ecule. In the crystal, the mol-ecules are linked by C-H⋯Cl hydrogen bonds, forming layers parallel to (100) separated by layers of THF solvent mol-ecules.