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ISSN: 2414-3146

June 2021 issue

Early view articles

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metal-organic compounds

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The title compound forms a one-dimensional coordination polymer containing alternating six-coordinate Cd and four-coordinate Ni atoms, linked by bridging cyano ligands

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The cationic complex of the title compound contains an RhI atom with a pseudo-square planar coordination environment. It is ligated by an N-heterocyclic carbene, a triphenylphosphane, and a bidentate cylco­octa­diene ligand. Charge balance is achieved from an out-sphere tetra­fluorido­borate anion.

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The mol­ecular structure of the title complex consists of an eight-membered Cu4C4 ring with an alternating arrangement of copper(I) atoms and μ-mesityl groups. Two of the copper(I) atoms are additionally linked to PMe3 ligands, giving a distorted trigonal coordination.

organic compounds

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Crystal growth of 3′-carb­oxy-3-methyl-[1,4′-bipyridin]-1-ium chloride in ethanol led to single crystals of ethyl 4-oxo-1,4-di­hydro­pyridine-3-carb­oxy­lic acid, which likely resulted from hydrolysis and esterification of the original compound, and its crystal structure was determined by single-crystal X-ray diffraction.

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The asymmetric unit of the title mol­ecular salt contains two cations and two anions, which are linked by N—H⋯N hydrogen bonds in the extended structure.

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The asymmetric unit of the title solvated mol­ecular salt consists of 1.5 cations, three bromide anions and one ethanol solvent mol­ecule of crystallization. The half-cation is completed by crystallographic inversion symmetry. In the crystal, O—H⋯Br hydrogen bonds and weak C—H⋯Br inter­actions link the components.

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The structure of the neutralization product of 3-nitro­benzoic acid and pyridine is reported. A combination of hydrogen bonding and π–π inter­actions link the mol­ecules, forming long-range order.

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The title compound is a monoclinic polymorph of the previously reported triclinic form. In the crystal, parallel offset π-stacking and ionic inter­actions consolidate the packing.

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In the title compound, the dihedral angle formed between the plane of the chromenone ring system (r.m.s. deviation = 0.031 Å) and the pendant benzene ring is 31.09 (5)°. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into C(6) chains propagating along the a-axis direction.
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