Synthesis and structures of 11,11,12,12-tetra­cyano-2,6-di­iodo-9,10-anthraquinodi­methane and its 2:1 cocrystals with anthracene, pyrene and tetra­thia­fulvalene

In the structures of 11,11,12,12-tetra­cyano-2,6-di­iodo-9,10-anthraquinodi­methane (DITCAQ) and its 2:1 cocrystals with tetra­thia­fulvalene, pyrene, and anthracene, the saddle-shaped DITCAQ mol­ecule gradually transforms into a less bent geometry as the charge-transfer inter­actions between DITCAQ and the electron donors strengthens.

Structural and theoretical characterization of a new twisted 4′-substituted terpyridine compound: 4′-(isoquinolin-4-yl)-2,2′:6′,2′′-terpyridine

4′-(Isoquinolin-4-yl)-2,2′:6′,2′′-terpyridine exhibits a short H⋯H contact, which an Atoms In Mol­ecules (AIM) analysis disclosed as attractive.

Synthesis and characterization of a cadmium(II)–organic supra­molecular coordination compound based on the multifunctional 2-amino-5-sulfo­benzoic acid ligand

In a cadmium(II)–organic supra­molecular coordination compound based on the multifunctional ligand 2-amino-5-sulfo­benzoic acid, inter­molecular hydrogen bonds link the mononuclear units into a novel threefold polycatenated two-dimensional (4,4) supra­molecular layer, which is further extended into a three-dimensional supra­molecular network through strong inter­layer hydrogen bonds. The complex exhibits an irreversible dehydration–rehydration behaviour and a weak blue fluorescence emission in the solid state.

A new antibacterial silver(I) complex incorporating 2,5-di­methyl­pyrazine and the anti-inflammatory diclofenac

A novel two-dimensional polymeric silver(I)–diclofenac complex incorporating additional 2,5-di­methyl­pyrazine bridging ligands has been tested for its in vitro anti­bacterial activity and is determined to be highly effective on the studied microorganisms.

Crystal structures of deprotonated nucleobases from an expanded DNA alphabet

6-Amino-5-nitro­pyridin-2(1H)-one crystallizes from water as a 1:1 complex of its neutral and deprotonated forms, and forms a `skinny' pyrimidine–pyrimidine pair. The pair resembles the known inter­calated cytosine pair. Implications of this structure for the use of this heterocycle in artificial DNA are discussed.

A novel one-dimensional double-chain-like Zn^II coordination polymer: poly[bis­(1-benzyl-1H-imidazole-κN³)tris­(μ-cyanido-κ²C:N)(cyanido-κC)disilver(I)zinc(II)]

In a novel one-dimensional linear coordination polymer, [Zn(BZI)₂{Ag(CN)₂}₂]_n (BZI is 1-benzyl-1H-imidazole), strong inter­molecular Ag^I⋯Ag^I inter­actions between adjacent chains provide a one-dimensional linear double-chain-like structure. The photoluminescence properties of the compound have been investigated.

(H₃O)₃Sb₂Br₉: the first member of the M₃E₂X₉ structure family with oxonium cations

The metastable compound (H₃O)₃Sb₂Br₉ is the first Tl₃Bi₂I₉ type representative comprising oxonium cations. The crystal structure comprises characteristic ²_∞[SbBr₃Br_3/2] double layers of corner-sharing SbBr₆ octa­hedra with a [001] stacking direction. Due to the small size of the H₃O⁺ cation and O—H⋯Br hydrogen bonding, the octa­hedra are tilted.

Monoclinic-to-ortho­rhom­bic phase transition of the hexa­methyl­ene­tetra­mine–2-methyl­benzoic acid (1/2) cocrystal with temperature-dependent dynamic mol­ecular disorder

The hexa­methyl­ene­tetra­mine–2-methyl­benzoic acid (1/2) cocrystal undergoes a reversible second-order ferroelastic phase transition from the monoclinic low-temperature phase in the space group P2₁/c (≤164 K) to the ortho­rhom­bic high-temperature phase in the supergroup Pccn (≥165 K).

Three polymorphs of an inclusion compound of 2,2′-(disulfanedi­yl)di­benzoic acid and tri­methyl­amine

For one inclusion compound with the same 2,2′-(disulfanedi­yl)di­benzoic acid (DTSA) and tri­methyl­amine components, three polymorphs were obtained at the same time, which is not normal for inclusion compounds. Studying the different polymorphs helps us to understand the packing modes of DTSA in crystal structures.

Solvent dependence of the solid-state structures of salicylaldiminate magnesium amide complexes

Two new salicylaldiminate–magnesium complexes have been synthesized and structurally characterized. This study has shown that these specific systems are prone to ligand redistribution in solution and that the isolation of heteroleptic salicylaldiminate–magnesium amides is solvent dependent.

A new solvate of furosemide with di­methyl­acetamide

In a new solvate of furosemide with di­methyl­acetamide (DMA), the channeled structure formed on slow crystallization contains DMA solvent mol­ecules in the channels. The furosemide mol­ecule exhibits high conformational lability due to the rotational flexibility of both the sulfamoyl and furan­ylmethyl­amino fragments. The current structure differs from other furosemide solvates in the number of solvent mol­ecules per furosemide mol­ecule.

A one-dimensional zinc(II) coordination polymer with a three-dimensional supra­molecular architecture incorporating 1-[(1H-benzimidazol-2-yl)meth­yl]-1H-tetra­zole and adipate

A new inorganic–organic coordination polymer based on Zn^II cations and mixed multidentate N-donor 1-[(1H-benzimidazol-2-yl)meth­yl]-1H-tetra­zole (bimt) and bridging O-donor adipate ligands has been prepared and structurally characterized. The Zn^II ions are connected by adipate ligands to generate a one-dimensional chain. The bimt ligands coordinate to the Zn^II ions in a monodentate mode and are pendant on both sides of the main chain.

New fluorous ponytailed 4-[(2,2,2-tri­fluoro­eth­oxy)meth­yl]pyridinium halide salts

The reaction of 4-[(2,2,2-tri­fluoro­eth­oxy)meth­yl]pyridine with HX (X = I or Cl) yielded new fluorous ponytailed pyridinium halide salts exhibiting two types of hydrogen bonds, namely N—H⋯X and C—H⋯X. In the IR spectra, the iodide salt exhibited a blue shift with respect to the pyridinium N—H stretching band compared to the chloride salt.