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C-H • • • O interactions

Fig. 8 a The crystal is formed of columns of methoxychromate anions and of columns of bis-benzene chromium cations extending parallel to the c-axis. b The anions are apparently linked along the column via a short C-H O interaction (H O 2.381 A, C-H O 173°) between a methyl hydrogen and a chromate oxygen... [Pg.23]

Steiner, Th. (1995 ). Weak hydrogen bonding Part I. Neutron diffraction data of amino acid C-H suggests lengthening of the covalent C H bond in C-H... O interactions. J. Chem. Soc. Perkins Trans. II1315-9. [Pg.266]

Steiner, Th. (1997). Unrolling the hydrogen bond properties of C H...O interactions. Chem. Comm. 727-34. [Pg.266]

Reactions at metal surfaces. They have developed ReaxFF for Pt/C/H/O, Ru/H/O, and Ni/C/H/O interactions in order to enable a large-scale dynamical description of the chemical events at the fuel cell metal anode and cathode. [Pg.338]

C—H- O interactions. The three remaining adducts contain phen or its 4,7-dimethyl derivative. [Pg.231]

Theoretical methods suggest that each C—H O interaction in a... [Pg.144]

Adjacent ladders are cross-linked by strong O—H O hydrogen bonds via the water molecules. Incorporation into 19 of pyromellitic dianhydride (PMDA) 21 produces [DTPO]2[PMDA] which has a similar ladder structure, but in this case the PMDA molecules are also able to associate via C—H O hydrogen bonds (synthon XIII) to form tapes (Fig. 12.1 lb). In the absence of water molecules, adjacent ladders are bound via additional C—H O bonds. The overall structure, therefore, consists of a three-dimensional, C—H O bound DTPO network, threaded by PMDA tapes also bound via C—H O interactions (Fig. 12.1 lc). This fascinating structure represents a solid-state polypseudorotaxane mediated entirely by weak C—H O hydrogen bonds. [Pg.410]

Anthony et al. have recently demonstrated an equivalent structure-directing role for strong and weak hydrogen bonds [53]. Two oxa-androgens, 22 and 23, were found to have similar crystal structures, despite the substitution of a C—O—H O interaction in 22 for a C—H O interaction in 23. Further-... [Pg.410]

C—H O interaction mimicry and solid solution formation. J. Chem. Soc.,... [Pg.439]


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See also in sourсe #XX -- [ Pg.335 , Pg.391 , Pg.443 ]




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