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Transient Porosity in Densely Packed Crystalline Carbazole–(p-Diethynylphenylene)–Carbazole Rotors: CO2 and Acetone Sorption Properties

Authors :
Arián E. Roa
Braulio Rodríguez-Molina
Simón Hernández-Ortega
J. Raziel Álvarez
Joelis Rodríguez-Hernández
Salvador Pérez-Estrada
Andrés Aguilar-Granda
Ilich A. Ibarra
Elí Sánchez-González
Mario Rodríguez
Source :
Journal of the American Chemical Society. 139:7549-7557
Publication Year :
2017
Publisher :
American Chemical Society (ACS), 2017.

Abstract

We report for the first time the high sorption properties of a molecular rotor with no permanent voids or channels in its crystal structure. Such crystalline phase originates from THF, DCM, or the irreversible desolvation of entrapped benzene molecules. From these, the benzene in its solvate form acts as rotation stopper, as supported by dynamic characterization using solid-state 2H NMR experiments. In the solvent-free form, the diffusion of small quantities of iodine vapors caused a significant change in the intramolecular rotation, increasing the known activation energy to rotation from 8.5 to 10.6 kcal mol–1. Notably, those results paved the way for the discovery of the high CO2 uptake (201.6 cm3 g–1 at 196 K, under 1 atm) and acetone (5 wt %), a sorption property that was attributed to both, the restriction of the molecular rotation at low temperatures and the flexibility of the molecular axle made of conjugated p-(ethynylphenylene), surrounded by carbazole.

Details

ISSN :
15205126 and 00027863
Volume :
139
Database :
OpenAIRE
Journal :
Journal of the American Chemical Society
Accession number :
edsair.doi...........9d773d35c30c8bc40d0b4cb59fc8ab66
Full Text :
https://doi.org/10.1021/jacs.7b02015