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12 Another statistical study (T. Steiner and G. R. Desiraju, Chem. Commun., 1998, 891) based on the CSD showed that the directionality of C-H···O interactions decreases with decreasing C-H polarisation and confirmed the hydrogen bond character of the interaction.
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16 While our studies were underway a short structural report of 6 appeared (E. K. Morris, A. Cousson and W. Paulus, Z. Kristallogr. New Cryst. Struct., 1998, 213, 79). However it was determined to a lower resolution, 2θ = 40°.
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17 R. Boese and M. Nussbaumer, in Correlations, Transformations and Interactions in Organic Crystal Chemistry, IUCr Crystallographic Symposia, ed. D. W. Jones and A. Katrusiak, Oxford University Press, Oxford, 1994, vol. 7, pp. 20-37.
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19 G. M. Sheldrick, SHELXL-97, Program for the Refinement of Crystal Structures, University of Göttingen, Göttingen, Germany, 1997.
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For π-stacking interactions the geometrical parameters are given as interplanar distance/distance between the centroids. In all the stacking interactions reported in this work the interplanar angles are in the range 0 to 3°
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22 For π-stacking interactions the geometrical parameters are given as interplanar distance/distance between the centroids. In all the stacking interactions reported in this work the interplanar angles are in the range 0 to 3°.
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37
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4243229108
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in press
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23 Structure determination details with a description of twinning have been published as a short communication. See: R. Boese, A. Gehrke, M. Kapon and F. H. Herbstein, Acta Crystallogr., Sect., B, 2000, in press.
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24 R. Boese, H.-C. Weiss and D. Bläser, Angew. Chem., Int. Ed., 1999, 38, 988.
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39
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0008551408
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We note that those C-H···N contacts with comparably linear M···N···H geometries are more important than those with bent geometries
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25 We note that those C-H···N contacts with comparably linear M···N···H geometries are more important than those with bent geometries.
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42
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37049068351
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28 Similar observations have been made previously on C-H···O hydrogen bonds based on C-H group acidity. See: (a) G. R. Desiraju, J. Chem. Soc., Chem. Commun., 1989, 179;
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Desiraju, G.R.1
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