Zwitterionic and free forms of aryl­methyl Meldrum's acids

The conformational diversity of three aryl­methyl Meldrum's acids in the crystalline state has been studied. Despite the high structural similarity of these aryl­methyl Meldrum's acids, the nature of the different substituents resulted in remarkable differences in both the mol­ecular conformations and the crystal packing arrangements.

A new one-dimensional coordination polymer of 5-(1,3-dioxo-4,5,6,7-tetra­phenyl­isoindolin-2-yl)isophthalic acid with manganese

A manganese(II) coordination polymer, which incorporates 5-(1,3-dioxo-4,5,6,7-tetra­phenyl­isoindolin-2-yl)isophthalate, methanol and di­methyl­formamide ligands, shows one-dimensional 2-connected {0} uninodal chain networks, and free di­methyl­formamide mol­ecules are connected to the chains by O—H⋯O hydrogen bonds.

A two-dimensional cadmium(II) coordination polymer based on 1-cyano­methyl-4-aza-1-azonia­bicyclo­[2.2.2]octane and thio­cyanate ligands

A new cadmium–thio­cyanate coordination polymer with an inter­esting structural architecture has been prepared in aqueous solution. The Cd^II cations are linked by bridging thio­cyanate ligands to form a two-dimensional coordination polymer which lies parallel to the bc plane. Hydrogen-bonding inter­actions are involved in forming the three-dimensional architecture.

Two terphenyl-based diol hosts and corresponding solvent inclusions with di­methyl­formamide and aceto­nitrile

In two new 1,1′:4′,1′′-terphenyl-based diol hosts, steric shielding by terminal aromatic groups prevents mol­ecular association by conventional hydrogen bonding, with hydroxy H atoms involved in intra­molecular O—H⋯π contacts. Solvent-inclusion compounds with di­methyl­formamide favour the formation of strands of O—H⋯O hydrogen-bonded host and guest mol­ecules, and with aceto­nitrile, the formation of a host lattice with a channel-like cavity structure incorporating the solvent mol­ecule.

Synthesis, structure and characterization of two new metal–organic coordination polymers based on the ligand 5-iodo­benzene-1,3-di­carboxyl­ate

In two new Co^II/Zn^II coordination polymers based on the ligand 5-iodobenzene-1,3-dicarboxyl­ate, that with Co^II displays a twofold three-dimensional inter­penetrating α-Po network and that with Zn^II exhibits a two-dimensional (4,4) topological network architecture.

The solid-state emmissive chalcone (2E)-1-(5-chloro­thiophen-2-yl)-3-[4-(di­methylamino)phenyl]prop-2-en-1-one

The determination of the structure of the solid-state emissive chalcone (2E)-1-(5-chlorothiophen-2-yl)-3-[4-(dimethylamino)phenyl]prop-2-en-1-one is relevant because it will play an important role in theoretical calculations to investigate potential two-photon absorption processes and could also be useful for studying the interaction of such compounds with a biological target.

Amino­silanes derived from 1H-benzimidazole-2(3H)-thione

In two tri­methyl­silyl-substituted 1H-benzimidazole-2(3H)-thiones, noncovalent C—H⋯π inter­actions between the centroid of the benzmidazole system and the SiMe₃ groups form helicoidal arrangements in one, and dimerization results in the formation of (8) rings via N—H⋯S inter­actions, along with parallel π–π inter­actions between imidazole and benzene rings, in the second compound.

Synthesis and crystal structures of the racemic and meso forms of [1-{1′-4′-cyclo­penta­dienyl-4′-cobalta-1′,12′-dicarba-closo-dodeca­boranyl(10)}-4-cyclo­penta­dienyl-4-cobalta-1,12-dicarba-closo-dodeca­borane(10)], the former as its tetra­hydro­furan disolvate

The rac and meso forms of two bis(metallacarboranes) share the same overall conformation (Co—C—C′—Co′ ca 136°) and show clear evidence of intra­molecular steric crowding resulting in tilted cyclo­penta­dienyl ligands.

A zinc(II) metal–organic framework with a novel topology formed from 4,4′,4′′-nitrilo­tribenzoate and 4,4′-bi­pyridine ligands

A zinc(II) metal–organic framework with a novel topology, formed from 4,4′,4′′-nitrilo­tribenzoate and 4,4′-bi­pyridine ligands, possesses three kinds of crystallographically independent Zn^II cations, as well as binuclear Zn₂(COO)₄(bipy)₂ paddle-wheel clusters, and can be reduced to a novel topology of a (3,3,6)-connected 3-nodal net, with the Schläfli symbol {5.6²}₄{5².6}₄{5⁸.8⁷}.

Cocrystals of 2,6-di­chloro­aniline and 2,6-di­chloro­phenol plus three new pseudopolymorphs of their coformers

Noncoplanar arrangements of 2,6-di­chloro­phenol and 2,6-di­chloro­aniline with respect to their coformers are favoured, which is in agreement with the frequent occurrence of structural analogues in pharmacology and biology. Additionally, the integration of these compounds into synthon-based networks enhances their ability to form two-dimensional networks, either strongly involved or just as stabilizing compounds.

Synthesis, crystal structure, and spectroscopic and thermal properties of the polymeric compound catena-poly[[bis­(2,4-di­chloro­benzoato)zinc(II)]-μ-isonicotinamide]

A novel one-dimensional polymeric Zn^II–di­chloro­benzoate compound with isonicotinamide was synthesized and characterized by spectroscopic, structural and thermal methods. The compound is stabilized by supra­molecular inter­actions, such as π–π and hydrogen-bonding inter­actions.

A two-dimensional cadmium(II) polymer based on nicotinic acid and thio­cyanate ligands

In a new cadmium–thio­cyanate coordination polymer, the Cd^II cations are linked by nicotinic acid N atoms and by bridging thio­cyanate ligands to form a two-dimensional coordination polymer which lies parallel to the bc plane. Hydrogen-bond inter­actions between uncoordinated solvent water mol­ecules and the organic ligands are involved in the formation of the three-dimensional architecture.

Hirshfeld surface analysis of two new phosphoro­thioic tri­amide structures

The inter­molecular inter­actions in two new phospho­rothioic tri­amide structures are discussed using Hirshfeld surface analysis.

A two-dimensional cadmium(II) coordination polymer based on 5-(pyridin-4-yl)isophthalic acid: poly[[tetra­aqua­bis­[μ₃-5-(pyridin-4-yl)isophthalato]dicadmium(II)] penta­hydrate]

In the two-dimensional coordination polymer formed by cadmium and 5-(pyridin-4-yl)isophthalic acid, each ligand bridges three Cd^II cations and each Cd^II cation connects to three ligands to form a two-dimensional graphite-like 6³ layer structure. Adjacent layers are linked via hydrogen-bonding inter­actions, resulting in a three-dimensional supra­molecular architecture.

Positional isomeric effect on the crystallization of chlorine-substituted N-phenyl-2-phthalimido­ethane­sulfonamide derivatives

Positional isomerization (para, ortho and meta) has an effective role in the packing and inter­molecular inter­actions of N-chloro­phenyl-2-phthalimido­ethane­sulfonamide derivatives.