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Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890

September 2024 issue

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Cover illustration: The present paper reports the crystal structure of the salt poly[[μ-aqua-aqua­bis­(μ3-carba­moyl­cyano­nitro­somethanido)barium] monohydrate], {[Ba(μ3-C3H2N3O2)2(μ-H2O)(H2O)]·H2O}n, in which the Ba ions display a distorted ninefold coordination with four nitroso-, two carbonyl- and three aqua-O atoms as a tricapped trigonal prism. A three-dimensional framework structure is formed by face-sharing of the trigonal prisms, and the solvate water molecules populate the crystal channels. The structure suggests that small resonance-stabilized cyanonitroso anions can be utilized as bridging ligands for the supramolecular synthesis of MOF solids. See: Domasevitch, Senchyk, Ponomarova, Lysenko & Krautscheid [Acta Cryst. (2024). E80, 986–992].

research communications


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In the title compound, the phenyl rings of the chalcone unit subtend a dihedral angle of 26.43 (10)°. The phenyl rings of the pendant benz­yloxy groups are orientated at 75.57 (13) and 75.70 (10)° with respect to their attached ring. In the crystal, weak C—H⋯O and C—H⋯π inter­actions link the mol­ecules, forming C(15) chains propagating along [101].

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The crystal structure of (GlyH)6(Pb3I12) is reported. Dimeric cations of type (A+A+) for the amino acid glycine are observed for the first time.

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The title compound represents a ionic mixed-valent tin(II)–tin(IV) compound with the bivalent tin atom as central atom of the cation and the tetra­valent tin atom as central atom of the anion. Regarding the first and second coordination sphere, the bivalent tin atom is fourfold, seesaw and fivefold, trapezoid–pyramidal coordinated while the tetra­valent tin atom exhibits an octa­hedral coordination.

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The di­hydro­imidazole ring in the title mol­ecule is slightly distorted and the lone pair on the tri-coordinate nitro­gen atom is involved in intra-ring π bonding. In the crystal, C—H⋯O hydrogen bonds form inversion dimers, which are connected along the a- and c-axis directions by additional C—H⋯O hydrogen bonds, forming layers parallel to the ac plane.

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This work focused on characterizing the structure from a stereochemical point of view, discussing the PbII character. The XRD data were collected at 200 K.

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The di­hydro­quinoxaline unit in the title mol­ecule is not quite planar and the mol­ecule adopts a hairpin conformation due in part to an intra­molecular C—H⋯O hydrogen bond. In the crystal, the polar portions of the mol­ecules are associated through C—H⋯O and C—H⋯N hydrogen bonds and C—H⋯π(ring) and C= O⋯π(ring) inter­actions, forming thick layers parallel to the bc plane and with the n-octyl groups on the outside surfaces.

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The structures of Orn-free Gramicidin S with cis/trans-isomers of Hyp were solved, and the puckering of Hyp was unexpectedly down in both isomers.

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In the crystal structure of the title compound, C26H36N2O4, the tripodal mol­ecule adopts a conformation in which the substituents attached to the central benzene ring are arranged in an alternating order above and below the ring plane.

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The single-crystal X-ray structure of [(18-crown-6)K][SnPh3(ox)] (ox = C2O42−) is reported. Integrity between neighboring mol­ecules in the solid state is maintained by an array of C—H⋯O hydrogen bonds and C—H⋯π inter­actions.

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The crystal structure of mononuclear di­chlorido­palladium(II) complex with 2-(3-cyclo­pentyl-1,2,4-triazol-5-yl)pyridine is reported and discussed.

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The synthesis and structural characterization of a dinuclear CuII complex, [tri­chlorido­copper(II)]-μ-chlorido-{bis­[2-hy­droxy-N′-(propan-2-yl­idene)benzohydrazide]copper(II)} monohydrate, [Cu2Cl4(C10H12N2O2)2]·H2O or [Cu(H2L)2(μ-Cl)CuCl3]·H2O is reported

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In the crystal, mol­ecules are linked by inter­molecular N—H⋯O, C—H⋯O and C—H⋯Br hydrogen bonds, forming a three-dimensional network. In addition, pairs of mol­ecules along the c axis are connected by C—H⋯π inter­actions.

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The crystal structure of propane-1,3-diaminium squarate dihydrate (space group P4bm, Z = 2) features a triperiodic N—H⋯O and O—H⋯O hydrogen-bond network with a polar c axis.

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The synthesis and crystal structure of a new dinuclear copper(II) complex based on ethyl 2,2′-(1H-1,2,4-triazole-3,5-di­yl)-di­acetate is reported. Additionally, the results of a Hirshfeld surface analysis of [Cu2(C6H5N3O4)2(H2O)4]·2H2O are described.


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A new alkaline earth metal three-dimensional polar MOF structure in barium carbamoyl­cyano­nitro­somethanide is governed by bridging coordination of the nitroso- and aqua O-atoms, which support a face-sharing connection of coordination polyhedra.

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The crystal structure of the compound described here features both C—H⋯O and N—H⋯O intra­molecular hydrogen bonds, as well as a myriad of inter­molecular C—H⋯O hydrogen-bonding inter­actions.

Research communications

Research communications are designed to help authors bring out the science behind their structure determinations. Authors are encouraged to report more than one structure in the same communication and also to include the results of investigations with other techniques. The Research communications format makes Acta E the natural home for structure determinations with interesting science to report.

Emerging Sources Citation Index

Acta E is included in the Emerging Sources Citation Index.

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