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. 2011 Mar 1;12(1):401–410. doi: 10.1208/s12249-010-9556-z

Fig. 8.

Fig. 8

Optimized geometries obtained for the PEG···LPSF/FZ4 (I) and PVP···LPSF/FZ4 (II) hydrogen complexes, using results of the B3LYP/6-31G(d,p) calculations. The dashed lines represent the hydrogen bonds, with 1.87 and 1.80 Å for (I) and (II), respectively. The angles N–H∙∙∙O between the atoms involved in the hydrogen bonds are 164° and 172°, respectively for (I) and (II)