Synthesis, structure, thermostability and luminescence properties of Zn^II and Cd^II coordination polymers based on dimethysuccinate and flexible 1,4-bis­(imidazol-1-ylmeth­yl)benzene ligands

Two d¹⁰ coordination polymers of Zn^II and Cd^II based on 2,2-di­methyl­succinate and flexible 1,4-bis­(imidazol-1-ylmeth­yl)benzene as coligands have been synthesized under hydro­thermal conditions. Both complexes display a two-dimensional layered architecture and were characterized by elemental analysis, X-ray crystallography, IR spectroscopy and thermogravimetric analysis. They also display a strong blue photoluminescence in the solid state at room temperature.

Different mol­ecular conformations co-exist in each of three 2-aryl-N-(1,5-di­methyl-3-oxo-2-phenyl-2,3-di­hydro-1H-pyrazol-4-yl)acetamides: hydrogen bonding in zero, one and two dimensions

In each of three 2-aryl-N-(1,5-dimethyl-3-oxo-2-phenyl-2,3-di­hydro-1H-pyrazol-4-yl)acetamides, two different mol­ecular conformations co-exist in the crystalline state. In each, N—H⋯O hydrogen bonds give rise to cyclic (10) dimers which are further linked by C—H⋯O hydrogen bonds to give a supra­molecular assembly in zero, one or two dimensions.

Reactions between aryl­hydrazinium chlorides and 2-chloro­quinoline-3-carbaldehydes: mol­ecular and supra­molecular structures of a hydrazone, a 4,9-di­hydro-1H-pyrazolo­[3,4-b]quinoline and two 1H-pyrazolo­[3,4-b]quinolines

The reactions between aryl­hydrazinium chlorides and 2-chloro­quinoline-3-carbaldehydes under different conditions can give rise to a hydrazone, a 4,9-di­hydro-1H-pyrazolo­[3,4-b]quinoline or a 1H-pyrazolo­[3,4-b]quinoline. Various combinations of N—H⋯N and C—H⋯π(arene) hydrogen bonds lead to supra­molecular assemblies in the form of rings, chains or sheets.

Crystal structures of functional building blocks derived from bis­(benzo[b]thio­phen-2-yl)methane

The syntheses of three bis­(benzo[b]thio­phen-2-yl)methane derivatives are described and their crystal structures discussed comparatively. The conformations of the title compounds are compared with respective bioisoteres and active pharmaceutical ingredients (APIs) containing the dithiophen-2-yl­methane scaffold.

A ladder coordination polymer based on Ca²⁺ and (4,5-di­cyano-1,2-phenyl­ene)bis­(phospho­nic acid): crystal structure and solution-state NMR study

In a crystal structure based on _∞¹[Ca₂(H₂cpp)₂(H₂O)₂] ladders [H₂cpp is (4,5-di­cyano-1,2-phenyl­ene)bis­(phospho­nate)], the ladders close pack in the solid state with water mol­ecules mediated by various hydrogen-bonding inter­actions.

Concomitant polymorphs of 1,3-bis­(3-fluoro­phenyl)urea

1,3-Bis(3-fluoro­phen­yl)urea crystallizes in two conformational polymorphs. The urea molecules assemble into one-dimensional hydrogen-bonded chains, which adopt anti­parallel and parallel alignments in the two forms.

Crystal structure and magnetic properties of a linear tetra­nuclear Co^II cluster

A linear tetra­nuclear unit, in which the two Co^II ions at the ends are six-coordinated and the two inner Co^II ions are five-coordinated in a distorted triangular bipyramidal configuration, is the first example of (E)-2-[(2-hy­droxy­benzyl­idene)amino]­phenol in coordination chemistry co-operating with 1,10-phenanthroline under solvothermal conditions. Magnetic studies show the presence of ferromagnetic Co^II⋯Co^II exchange inter­actions in the tetra­nuclear unit.

Spectroscopic characterization and mol­ecular structure of 3,14-di­methyl-2,6,13,17-tetra­aza­penta­cyclo­[16.4.0.1^2,17.1^6,13.0^7,12]tetra­cosa­ne

3,14-Dimethyl-2,6,13,17-tetra­aza­penta­cyclo­[16.4.0.1^2,17.1^6,13.0^7,12]tetra­cosane was synthesized and characterized by elemental, spectroscopic and single-crystal X-ray diffraction analyses. The crystal structure is stabilized by intra­molecular C—H⋯N hydrogen bonds. NMR and IR spectroscopic properties support the methyl­ene-bridged macrocyclic structure.

One barbiturate and two solvated thio­barbiturates containing the triply hydrogen-bonded ADA/DAD synthon, plus one ansolvate and three solvates of their coformer 2,4-di­amino­pyrimidine

The triply hydrogen-bonded ADA/DAD synthon (D = donor and A = acceptor) was successfully formed in the crystal structure of 2,4-di­amino­pyrimidinium barbiturate and in two solvates of 2,4-di­amino­pyrimidinium 2-thio­barbiturate. An additional crystallization study of pure 2,4-di­amino­pyrimidine revealed (8) N—H⋯N hydrogen-bond motifs to be the preferred inter­action in the structures of one ansolvate and three solvates.