Hydrogen-bonding distance

Acetylene is linear with a carbon-carbon bond distance of 120 pm and carbon-hydrogen bond distances of 106 pm... 

Fig. 31. Stereoview of the 24 acetone clathrate down the channel axis. Each acetone guest is within a hydrogen bonding distance from one of the hydroxyl sites of the host481...

Fig. 4 Proposed defect cluster model in as-made zeolites with quaternary ammonium cations as structure directing agents (SDAs) hydrogen bond distances of 1.68 A are determined experimentally from the H NMR chemical shift of 10.2 ppm X and Y are atoms not further specified in the SDA the interaction between the SDA and the SiO- group is assumed based on bond valence arguments (see text)...

TABLE V. Optimized hydrogen bonds distances for the AT and CG complexes (A)... 

Concomitant with the change in the oxygen coordination number is a shift of the first minimum of the O-H RDF from 1.30 A at 34 GPa to 1.70 A at 115 GPa. We observe a similar structural change in the H-H RDF in which the first peak lengthens from 1.63 A (close to the result for ambient conditions) to 1.85 A. These observations bear a strong resemblance to the ice VII to ice X transition in which the covalent O-H bond distance of ice becomes equivalent to the hydrogen bond distance as pressure is increased.82 However, the superionic phase differs from ice X, in that the position of the first peak in g(RoH) is not half the distance of the first 0-0 peak.82 We analyze the effect... 

Here, shb is the hydrogen bonding energy parameter, r is the natural hydrogen bond distance, rYh is the actual hydrogen bond distance Y... H, ft is the H—X. .. Y angle, rxH and 4h are the actual and natural H—X bond lengths, respectively, and e is the dielectric constant. 

We conclude our discussion about orientational correlation between pairs of nearneighbor molecules in D20(as) with some observations about hydrogen bond distances and angles. In Fig. 7g we show the correlation functions... 

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