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Journal logoSTRUCTURAL
ISSN: 2053-2296

June 2017 issue

Early view articles

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research papers

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The crystal structure of the opthalmic drug prednisolone acetate has been refined using the classical independent atom model (IAM), as well as by using the transferred electron-density parameters from an electron-density database. The results of the two refinements have been compared. Structure–property relationships have been described based on the calculation of electron-density-derived properties.

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A photochromic one-dimensional magnesium(II) linear coordination polymer has been prepared using the N,N′-bis­(3-carb­oxy­phen­yl)naphthalene-1,8:4,5-tetra­carboximide ligand and exhibits prominent photochromic behaviour upon light irradiation.

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The crystal structures of the first-row transition-metal (Mn to Zn) complexes of the form [M(en)3](OAc)2 (en is ethyl­enedi­amine and OAc is acetate) are presented. The structures are isomorphous, with the [M(en)3]2+ complex cations connected through a series of hydrogen bonds to the acetate ions, generating three-dimensional networks.

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The crystal structures of di-L-phenyl­alanine obtained by slow evaporation of tetra­hydro­furan are presented at two temperatures (100 and 299 K). The hydrogen-bond patterns are different compared to that of crystals grown from water and methanol.

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The mol­ecular structure of a natural di­hydro-β-agaro­furan sesquiterpene, isolated from Maytenus boaria, is reported and its hydrogen-bonded three-dimensional crystal structure discussed.

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Mol­ecules of (Z)-2-(2-phenyl­hydrazinyl­idene)acenaphthen-1(2H)-one (PDAK) are linked together forming face-to-face assemblies held together by inter­molecular C—H⋯O, π–π and C—H⋯π inter­actions. PDAK exhibits a broadband UV–Vis absorption (200–648 nm) and a low HOMO–LUMO energy gap (1.91 eV), while fluorescence quenching experiments provide evidence for electron transfer from the excited state of PDAK to C60.

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Two C-24 epimeric 20(S)-ocotillol-type saponins were synthesized and their structures characterized. One of the epimers was obtained in two different solvate forms which display identical conformations but different crystal packings.

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The hydro­thermal synthesis of a twofold three-dimensional heterometallic metal–organic framework (MOF) involving the 2-methyl­biphenyl-4,4′-di­carboxyl­ate ligand leads to a material that displays an intense blue luminescence.

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In bis­(1,1′-dimethyl-4,4′-bipyridine-1,1′-diium) hexa­cyanidoferrate(II) octa­hydrate, the cation is located on a general position and adopts a noncoplanar structure, with a dihedral angle of 40.32 (7)° between the planes of the pyridine rings. In the crystal, layers of electron-donor [Fe(CN)6]4− anions and layers of electron-acceptor cations are stacked in an alternating manner.

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In cocrystals of 5-fluoro­uracil with 5-bromo­thio­phene-2-carb­oxy­lic acid and thio­phene-2-carb­oxy­lic acid, two types of base pairs [R_{2}^{2}(8) homosynthon] and carb­oxy­lic acid dimers [R_{2}^{2}(8) homosynthon] are formed. Both cocrystals display robust R_{2}^{2}(8) supra­molecular synthons, π–π stacking and C—F⋯π inter­actions, leading to supra­molecular architectures.

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In the heteroleptic cuprous complex [Cu(Xantphos)(8-HOXQ)]PF6 [Xantphos is 9,9-dimethyl-4,5-bis­(di­phenyl­phosphan­yl)-9H-xanthene and 8-HOXQ is 2-methyl­quinolin-8-ol], the hy­droxy group of the N,O-chelating 8-HOXQ ligand remains protonated. TD–DFT (time-dependent density functional theory) studies demonstrate that the yellow phospho­rescence is most likely derived from the emissive (M+L′)→LCT (LCT is ligand charge transfer) excited state.

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Two dinuclear CoII complexes incorporating tetra­dentate 2-meth­oxy-N,N-bis­[(pyridin-2-yl)meth­yl]aniline and N,N-bis­[(pyridin-2-yl)meth­yl]quinolin-8-amine ligands, with the metal centres doubly bridged by two diphenyl phosphate ester groups, have similar structures with distorted octa­hedral geometries around the metal centres. A number of aromatic–aromatic inter­actions present in the crystal lattices stabilize the solid-state structures.

Special and virtual issues

Acta Crystallographica Section C has recently published special issues on

NMR Crystallography (March 2017)

Scorpionates: a golden anniversary (November 2016)

Full details are available on the special issues page.

The latest virtual issue features Coordination polymers, with an introduction by Len Barbour.

What are the 'most read' articles from the recent special issues?

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