Transformation of benzene to a polymer after static pressurization to 30 GPa

Abstract

After pressurization to 30 GPA, in a diamond anvil cell, benzene transforms, at room temperature, to a white solid which is stable at ambient pressure. We report here the infrared spectroscopy analysis performed under pressure and at ambient conditions. These preliminary results show that the transformation involves an opening of the benzene rings leading to a highly cross-linked polymer.

Pressure-induced transformations of materials: light spectroscopy investigations

“…The feature is similar to the one found for KH 2 PO 4 (at $1.7 GPa) (Samara and Peercy, 1981). The phase diagram of the AFE-PE (ice VIII-VII) transition, shown in Figure 5, was discussed in previous publications (Pruzan, 1994;Pruzan et al, 1993Pruzan et al, , 1997Pruzan et al, , 2003. The pressure dependence of T c exhibits three zones, two plateaux separated by the linear region assigned to a classical regime of suppression of antiferroelectricity.…”

“…However it is to be noted that the drop of T c in ice at $62 GPa (72 GPa for D 2 O) is very abrupt compared to BaTiO 3 and specifically to KH 2 PO 4 . In fact in ice a true plateau is observed and the data are better fitted with the function provided by the pseudo-spin model than a half-power law (Pruzan, 1994;Pruzan et al, 1993Pruzan et al, , 2003. The plateau below $15 GPa is due to the suppression of the (long-range) antiferroelectric order by thermal fluctuations.…”

“…Below 15 GPa: plateau due to temperature-induced disorder of the long range dipole moment (see the text). A vertical line transition separates the VII and X dis domains, not drawn for simplicity (Pruzan et al, 2003). The symmetric hydrogen-bonded solid X ord is found above 100 GPa It is of importance to recall that the drop of the v OH frequency vs decreasing O-O distance is also obtained on measurements at ambient pressure made from a series of H-bonded compounds with increasing hydrogen bond force (Novak, 1974).…”

Synthesis and optical properties of σ–π conjugated aluminum-containing polyphenylcarbosilane (Al-PPCS) by hydrosilylation polymerization

“…The absorptions observed at around 1450, 1500, 1580 and 1600 cm À1 are attributed to stretching vibration of C¼C in aromatic rings [46][47][48]. The bands at around 3010-3100 cm À1 are due to aromatic stretching CÀ ÀH vibrations of benzene ring.…”

The high pressure reactivity of substituted acetylenes: a vibrational study on diphenylacetylene

“…The high-pressure reactivity of benzene has also been extensively investigated [4][5][6][18][19][20][21]. The aromatic stabilization of benzene is clearly evidenced by the higher reaction pressure with respect to linear unsaturated hydrocarbons.…”