ABSTRACT:The radiation curings of collagen/divinyl ether enhanced by several nitrogenous onium salts having relatively stable nonnucleophilic anion (PF 6 Ϫ ) have been investigated. Results of glass transformation temperature (T g ) measurements and IR spectroscopy analysis and solvent extractions to the crosslinked polymer networks demonstrate that the curing reactions have been initiated by electron beam irradiation in the mixture system of collagen/ divinyl ether and onium salts under different atmosphere conditions. The experimental data show the presence of an approximating linear relationship between double bond conversion and gel fraction after the calculation of conversion from IR spectra in oligomer and the measure of gel content at different total radiation doses. Practical values approximate theoretical values in applying gelation theory of the relationship of gel fraction and double bond conversion. In comparison with the influence of different inhibitors, the curing reaction with pyridinium salts is a polymerization and crosslinking of cationic mechanism, but radicals play an important role in initiation.

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An H2O2 molecule was isolated inside hydroxylated open‐cage fullerene derivatives by mixing an H2O2 solution with a precursor molecule followed by reduction of one of carbonyl groups on its orifice. Depending on the reduction site, two structural isomers for H2O2@open‐fullerenes were obtained. A high encapsulation ratio of 81 % was attained at low temperature. The structures of the peroxosolvate complexes thus obtained were studied by 1H NMR spectroscopy, X‐ray analysis, and DFT calculations, showing strong hydrogen bonding between the encapsulated H2O2 and the hydroxy group located at the center of the orifice. This OH group was found to act as a kinetic stopper, and the formation of the hydrogen bonding caused thermodynamic stabilization of the H2O2 molecule, both of which prevent its escape from the cage. One of the peroxosolvates was isolated by HPLC, affording H2O2@open‐fullerene with 100 % encapsulation ratio, likely due to the intramolecular hydrogen‐bonding interaction.

A polar CH3CN molecule has been encapsulated inside an open‐cage C60 derivative under high pressure. The inserted CH3CN molecule has an impressive effect on the outer carbon cage, as shown by the enhanced polarity and decreased LUMO level. Crystallographic and computational analyses revealed that these changes were governed by the existence of the CH3CN and cage deformation caused by the insertion. Moreover, the favored binding affinity of CD3CN compared with CH3CN was affirmed. More information can be found in the Research Article by Y. Murata and co‐workers (DOI: 10.1002/chem.202301161).

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