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)