Designer crystals: intermolecular interactions, network structures and supramolecular synthons
نویسندگان
چکیده
منابع مشابه
Van der waals and polar intermolecular contact distances: quantifying supramolecular synthons.
Crystal structures are viewed as being determined by ranges and constraints on interatomic contact distances between neighboring molecules. These distances are considered to arise from environment-dependent atomic sizes, that is, larger sizes for isotropic, van der Waals type contacts and smaller sizes for more-polar, possibly ionic contacts. Although the idea of different, or anisotropic, radi...
متن کاملIdentifying the intermolecular hydrogen-bonding supramolecular synthons in an indomethacin-nicotinamide cocrystal by solid-state NMR.
Two-dimensional (1)H double-quantum and (14)N-(1)H & (1)H-(13)C heteronuclear magic-angle spinning (MAS) NMR spectra recorded at natural isotopic abundance identify specific intermolecular COOH···N(arom) and CH(arom)···O=C hydrogen-bonding interactions in the solid-state structure of an indomethacin-nicotinamide cocrystal, thus additionally proving cocrystal formation.
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P.09.05.7 Acta Cryst. (2005). A61, C362 M–XX'–C Halogen Bonds as Efficient and Reliable Supramolecular Synthons in Organic-inorganic Crystals Fiorenzo Zordan, Lee Brammer, Paul Sherwood, Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK. Computational Science and Engineering Department, CCLRC Daresbury Laboratory, Daresbury, Warrington WA4 4AD, UK. Email: lee.brammer@sheffi...
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Analysis of the strengths and directionality of intermolecular interactions in the crystals containing only one type of supramolecular synthon allows the suggestion of a general classification of molecular crystals depending on type of their basic structural motifs. All crystals may be divided on four classes namely (I) crystals with isotropic packing of the building units; (II) columnar crysta...
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Simple methods to analyze the anomalous behavior o f NQ R parameters are presented. Unusual positive temperature coefficients o f antimony resonance frequencies in (N H 4)2SbF5 below the phase transition at 169 K were interpreted in terms o f ordering processes o f the ammonium ions. Calculation o f the EFG in LaF3 revealed that the translational diffusion of Li ions brings about an anomalous d...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A Foundations of Crystallography
سال: 1996
ISSN: 0108-7673
DOI: 10.1107/s0108767396098947