Hydrogen bonds in unpolar matrix — Comparison of complexation in polymeric and low molecular-weight systems

摘要: By ene-reaction of 4-phenyl-1,2,4-triazoline-3,5-dione with double bonds, polar 4-phenyl-1,2,4-triazolidine-3,5-dione (phenyl urazole) groups are introduced into unpolar matrices. Hydrogen-bond complexes formed between two amide-like units. The temperature dependence complex formation in dilute hydrocarbon medium is obtained from remperature-dependent IR spectra the region C=O stretching vibration. Results for a low molecular-weight model system compared modified polybutadienes, where attached statistically along polymer backbone. enthalpy and entropy (ΔH f =−28.6 kJ/mol; ΔS =−52 J/mol K−1) prove dimeric chelate like involving hydrogen bonds. lower equilibrium constants observed to related additional topological constraints emerging