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• W2755820826 abstract "Abstract Evidence for the surprising formation of polymeric phases under high pressure for conjugated nanohoop molecules was found. This paper represents one of the unique cases, in which the molecular‐level effects of pressure in crystalline organic solids is addressed, and provides a general approach based on vibrational Raman spectroscopy combining experiments and computations. In particular, we studied the structural and supramolecular chemistry of the cyclic conjugated nanohoop molecule [5]cyclo‐ para ‐phenylene ([5]CPP) under high pressures up to 10 GPa experimentally and up to 20 GPa computationally. The theoretical modeling for periodic crystals predicts good agreements with the experimentally obtained Raman spectra in the molecular phase. In addition, we have discovered two stable polymeric phases that arise in the simulation. The critical pressures in the simulation are too high, but the formation of polymeric phases at high pressures provides a natural explanation for the observed irreversibility of the Raman spectra upon pressure release between 6 and 7 GPa. The geometric parameters show a deformation toward quinonoid structures at high pressures accompanied by other deformations of the [5]CPP nanohoops. The quinonoidization of the benzene rings is linked to the systematic change of the bond length alternation as a function of the pressure, providing a qualitative interpretation of the observed spectral shifts of the molecular phase." @default.
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• W2755820826 date "2017-10-30" @default.
• W2755820826 modified "2023-10-14" @default.
• W2755820826 title "High-Pressure Chemistry and the Mechanochemical Polymerization of [5]-Cyclo-<i>p</i> -phenylene" @default.
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• W2755820826 doi "https://doi.org/10.1002/chem.201703435" @default.
• W2755820826 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28898486" @default.
• W2755820826 hasPublicationYear "2017" @default.
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