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March 2019 issue
research communications
The analysis of atom-to-atom and/or residue-to-residue contacts remains a favoured mode of analysing the molecular packing in crystals. This contribution highlights tools for this analysis such as Crystal Explorer and NCIPLOT, which is used to evaluate the nature, i.e. attractive/weakly attractive/repulsive, of specific contacts. This is complemented by a discussion of the calculation of energy frameworks utilizing the latest version of Crystal Explorer. These programs are free of charge and straightforward to use. They complement each other to give a more complete picture of how molecules assemble in molecular crystals.
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The title compound is a host–guest complex of the tris-urea receptor, 3-(4-nitrophenyl)-1,1-bis{2-[3-(4-nitrophenyl)ureido]ethyl}urea, encapsulating a hydrogen-bonded chain of dihydrogen phosphate anions.
CCDC reference: 1893140
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The title Schiff base compound, has an E configuration with respect to the C=N bond, and the benzene rings are inclined to each other by 15.7 (2)°. In the crystal, molecules are linked by N—H⋯O and C—H⋯O hydrogen bonds, forming chains along [001] which enclose (6) loops.
CCDC reference: 1587252
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In the title complex, the nickel(II) ion has a square-planar coordination sphere, being ligated by two N and two O atoms of the tetradentate Schiff base ligand 6,6′-{(1E,1′E)-[ethane-1,2-diylbis(azanylylidene]bis(methanylylidene)}bis[2-(trifluoromethoxy)phenol].
CCDC reference: 1890705
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The crystal structure of the perchlorate salt of a cis-hexamethyl-substituted Ni-14 macrocycle contains two diastereomeric macrocyclic cations in the asymmetric unit, one with two NH protons on each side of the cation, and the other with all four NH protons on the same side. The latter diastereomer is also found in the crystal structure of a bromide trihydrate salt of the same Ni-14 macrocycle.
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This is the second reported crystal structure of an adduct of a 2,3-disubstituted 1,3-thiazolidine-4-one ligand and triphenyltin chloride. The tin atom adopts a trigonal–bipyramidal coordination geometry with the O and Cl atoms in the axial sites.
CCDC reference: 1894217
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The compound [RuCl2(C21H26N2)(C11H15N)] is an example of a new generation of N,N-dialkyl metallocomplex ruthenium catalysts with an N→Ru coordination bond in a six-membered chelate ring.
CCDC reference: 1894660
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The tetrahedral-octahedral framework crystal structure of hydrothermally synthesized CsGa(HAsO4)2 was solved by single-crystal X-ray diffraction. CsGa(HAsO4)2 crystallizes in the polar RbAl(HAsO4)2 structure type (R32).
CCDC reference: 1895785
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The complex cation of the title compound has a five-coordinate slightly distorted trigonal–bipyramidal structure in which three S atoms are located in the equatorial positions, and one P and one Cl atom in the apical positions.
CCDC reference: 1895701
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In the title hydrated azo dye, the benzene and thiazole make a dihedral angle of 4.69 (17)°. In the crystal, hydrogen bonds, C—H⋯π and π–π interactions resulting in the formation of a three-dimensional framework.
CCDC reference: 1895710
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The title compound, [Fe(C27H41N10O3)](PF6)2, is an example of an iron(II) spin-crossover compound. In this compound, C⋯F and CH⋯F/O contacts, present between the cations and anions, extend the structure into a three-dimensional supramolecular network.
CCDC reference: 1893862
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The title compound, C14H12ClNO3, adopts the keto–enamine tautomeric form. In the crystal, molecules form stacks along the [001] direction. The crystal packing is further stabilized by O—H⋯O and C—H⋯O hydrogen bonds and C—H⋯Cl and C—H⋯π contacts.
CCDC reference: 1886956
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The title compound, the potassium salt of a benzothiazol(methylsulfanyl)pyriminidine, was obtained in a reaction designed to deliver a neutral 2-pyrimidylbenzothiazole. It crystallized with two independent molecular units in the asymmetric unit.
CCDC reference: 1896740
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In the title compound, the heterocyclic portion of the dihydrobenzothiazine unit adopts a shallow boat conformation. The propynyl substituent is nearly perpendicular to the plane formed by the rails of the boat. In the crystal, inversion dimers are formed by weak C—H⋯F hydrogen bonds with the dimers forming oblique stacks along the a-axis direction.
CCDC reference: 1897371
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The crystalline structure of a new three-dimensional coordination polymer based on LaIII and 1,4-phenylenediacetate ligands is described.
CCDC reference: 1875083
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The title host compound, designed to self-assemble to form a new type of extended core Piedfort unit reminiscent of an eight-legged spider host, forms a number of crystalline inclusion compounds favouring oxygen-containing guest molecules. We have established the presence of this unit in the unsolvated molecular crystal at 100 K, which is monoclinic, space group P21/n, with Z = 8. The new Piedfort unit is chiral and its core structure closely approximates to D2 symmetry, with both enantiomers present in the crystal. Rather than being superposed with a staggered arrangement of nitrogen atoms, the rings are rotated by an angle of approximately 45° with respect to each other.
CCDC reference: 1897649
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Ba2Co(BO3)2 crystallizes in a novel structure type, with [CoO5] square pyramids linked to BO3 triangles through corner- or edge-sharing, and the Ba2+ cations in the voids of this arrangement.
CCDC reference: 1898300
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In the title molecule, the oxopyridazinyl ring is N-bound to an ethylacetate group with benzyl and methyl groups substituted at adjacent C atoms. In the molecular packing, methylene-C—H⋯O(ring carbonyl) and N(pyridazinyl) interactions result in the formation of a supramolecular tape along the a-axis direction.
CCDC reference: 1897511
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Acetic acid is a by-product of peracetic acid with acute irritant properties when present in air. The cavitand 5,11,17,23-tetramethyl-4,24:6,10:12,16:18,22-tetrakis(methylenedioxy)resorcin[4]arene functionalized at the upper rim with a carboxylic acid group, CavCOOH-in, was synthesized and crystallized with acetic acid to evaluate its molecular recognition properties towards this analyte in the solid state.
CCDC reference: 1897735
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K3Ni6Fe(PO4)6 has been synthesized by solid-state reaction and structurally characterized by single-crystal X-ray diffraction. Its structure is built up by [PO4] tetrahedra and [FeO6] and [NiO6] octahedra linked to each other by edge or corner sharing, leading to a three-dimensional framework delimiting tunnels along the [100] direction in which the K+ cations are localized.
CCDC reference: 1898755
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A new Si,Si-diphenyl-, P-chlorofunctionalized diazaphosphasiletidine has been synthesized. The crystal structure of the highly moisture-sensitive four-membered heterocyclic molecular compound, which has a remarkably elongated P—Cl bond, is described and compared with related compounds and their arrangement of molecules in the solid state.
CCDC reference: 1898427
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The crystal structure of dilithium potassium citrate has been solved and refined using laboratory X-ray powder diffraction data, and optimized using density functional techniques. The KO7 coordination polyhedra share edges, forming chains parallel to the a axis. These chains share edges with one tetrahedral Li, and are bridged by edge-sharing pairs of the second tetrahedral Li, forming layers parallel to the ac plane.
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Molecules of the three components, idelalisib, tert-butanol and water, are linked into a hydrogen-bonded chain structure with the topology of a 2,3,4,5-connected 4-nodal net.
CCDC reference: 1898812