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The article provides information regarding the requirements in submitting manuscripts for publication, intended for authors who have interests in the fields of chemistry, biochemistry, mineralogy, pharmacology, physics and materials science. Guidelines about submission requirements, publication requirements, data requirements, diagram requirements, nomenclature, and references are presented.

Focuses on the continued rapid publication of the journal "Acta Crystallographica Section C". Release of high-quality papers related to chemistry, biochemistry, mineralogy, physiclas and materials science; Inclusion of studies involving special techniques and difficult crystalline materials; Issuance of inorganic and metal-organic papers.

Discusses developments for "Acta Crystallographica Section C" as of February 2004. Downward trend in publication times; Changes in the policy on submission of articles for publication.

The structure of the title centrosymmetric compound, [Zn(C9H6NO)2(H2O)2], has already been solved three times [Merritt, Cady & Mundy (1954). Acta Cryst. 7, 473-476; Palenik (1964). Acta Cryst. 17, 696-700; Chen, Zhang, Shi, Huang, Liang & Zhou (2003). Acta Cryst. E 59, m814-m815]. The authors of the two most recent papers state that they attained lower R1 values than that obtained in the 1954 paper, but they do not mention that Merritt et al. had derived the structural model from a twinned crystal. Also, from a structural point of view, there are strong indications that the most recent report is in fact the isostructural CuII complex already reported by Okabe & Saishu [ Acta Cryst. (2001), E 57, m251-m252] and not the ZnII complex. The structure of the title compound is reported here based on data obtained from a twinned crystal. [ABSTRACT FROM AUTHOR]

N-Salicylideneaniline (SA), C13H11NO, belongs to the large family of aromatic Schiff bases. It is of particular importance owing to its reversible photoreactivity. SA forms two photochromic polymorphs, both with two non-coplanar benzene rings. In addition, we have recently discovered a planar polymorph, named the β-polymorph, which will be discussed in a subsequent paper. We report here the structure of the α2-polymorph in the orthorhombic crystal system. This compound exhibits a strong intramolecular O—H…N hydrogen bond and the dihedral angle between the two rings varies with temperature. [ABSTRACT FROM AUTHOR]

The article presents a paper about a polymorph of tetrakis(acetonitrile-kN)copper(I) tetrafluoridoborate. It says that for the structure determination, the researchers used a crystal that contained a volume fraction of 0.088 (7) of the Pna21 polymorph. According to the paper, the assymetric unit of (I) contains three independent pairs of cations and anions.

The title iron(II) complex, [Fe(CN)2(C15H23N3O2)]-H2O, is of interest to the spin-crossover community because of its unusual temperature-dependent magnetic behaviour as well as its relatively high relaxation temperature for the light-induced spin-crossover phenomenon. Structural modifications are strongly suspected to cause the unusual thermal spin-crossover features. Recently, the high-spin crystal structure has been reported but with an inadequate space group. In the present paper, the crystal structure is corrected by a new investigation, and some consequences for the structure-property relationships of this complex are discussed. The FeII ion is seven-coordinate and lies on a twofold axis. [ABSTRACT FROM AUTHOR]

The structure of the title compound, tetrakis(2-methyl-2-phenyl­propyl)­stannane, (PhCMe2CH2)4Sn, has been determined at 293 K by Reuter & Pawlak (1998). This present determination was carried out at 150 K and as a result gives cell, coordinate and displacement parameters with much reduced s.u.'s. As is pointed out in the the above paper, the bonds and angles are similar to those in related Sn compounds although it is worth emphasizing that there are no intra- or intermolecular ring-ring interactions but that there are a numberof C-H...Cg(π-ring) interactions at the 3.0 Å level. [ABSTRACT FROM AUTHOR]

All the 139 noncentrosymmetric crystal structures published in Acta Crystallographica Section C between January 2011 and November 2012 inclusive have been used as the basis of a detailed study of the reporting of absolute structure. These structure determinations cover a wide range of space groups, chemical composition and resonant-scattering contribution. Defining A and D as the average and difference of the intensities of Friedel opposites, their level of fit has been examined using 2 AD and selected- D plots. It was found, regardless of the expected resonant-scattering contribution to Friedel opposites, that the Friedel-difference intensities are often dominated by random uncertainty and systematic error. An analysis of data collection strategy is provided. It is found that crystal-structure determinations resulting in a Flack parameter close to 0.5 may not necessarily be from crystals twinned by inversion. Friedifstat is shown to be a robust estimator of the resonant-scattering contribution to Friedel opposites, very little affected by the particular space group of a structure nor by the occupation of special positions. There is considerable confusion in the text of papers presenting achiral noncentrosymmetric crystal structures. Recommendations are provided for the optimal way of treating noncentrosymmetric crystal structures for which the experimenter has no interest in determining the absolute structure. [ABSTRACT FROM AUTHOR]

The present paper reports the crystal structures of two short phosphonotripeptides (one in two crystal forms) containing one ΔPhe (dehydrophenylalanine) residue, namely dimethyl (3-{[ tert-butoxycarbonylglycyl-α,β-( Z)-dehydrophenylalanyl]amino}propyl)phosphonate, Boc0-Gly1-Δ( Z)Phe2-α-Abu3PO3Me2, C21H32N3O7P, (I), and diethyl (4-{[ tert-butoxycarbonylglycyl-α,β-( Z)-dehydrophenylalanyl]amino}butyl)phosphonate, Boc0-Gly1-Δ( Z)Phe2-α-Nva3PO3Et2, as the propan-2-ol monosolvate 0.122-hydrate, C24H38N3O7P·C3H8O·0.122H2O, (II), and the ethanol monosolvate 0.076-hydrate, C24H38N3O7P·C2H6O·0.076H2O, (III). The crystals of (II) and (III) are isomorphous but differ in the type of solvent. The phosphono group is linked directly to the last Cα atom in the main chain for all three peptides. All the amino acids are trans linked in the main chains. The crystal structures exhibit no intramolecular hydrogen bonds and are stabilized by intermolecular hydrogen bonds only. [ABSTRACT FROM AUTHOR]

The article presents a paper about quinolin-6-ol at 100 K. It provides background on quinoline derivatives which are said to be known for their antifungal and antibacterial activities. The research focuses on the IR spectra of crystals with open hydrogen-bonded chains in the unit cell that is measured in the frequency range of the proton and deuteron stretching vibrations of the hydrogen bridge.

The article presents a paper which examines the role of isomeric acids in hydrogen-bonding patterns. According to the article, the maleic and fumaric acids in their complex forms exist as semimaleate and semifumarate ions, respectively. It mentions the use of maleic acid as a simple building block in supramolecular architectures in two and three dimensions.