Two polymorphs of 2,7-dihydrobenzo[1,2,3-cd:4,5,6-c′d′] diindazole ("dipyrazoloanthracene"; α and β; DBDI) were isolated and fully characterized by means of structural X-ray powder diffraction methods, thermal, and extended spectroscopic analyses. Different interconversion paths between the two species were evidenced. UV-vis absorption, emission, and excitation spectra were measured, while time-resolved fluorescence studies allowed for the detection of multiple decay processes. In the two species, NH···N hydrogen bonds give rise to manifestly different structures, which, in the rhombohedral β phase, generate permanent porosity. This feature has been further characterized by CO2/N2/CH4 sorption isotherms at different temperatures, highlighting a significant selectivity favoring CO2 trapping. © 2013 American Chemical Society.
Maspero, A., Giovenzana, G., Masciocchi, N., Palmisano, G., Comotti, A., Sozzani, P., et al. (2013). Mohlau's Anthradipyrazole Revisited: A New Look at an Old Molecular System. CRYSTAL GROWTH & DESIGN, 13(11), 4948-4956 [10.1021/cg4011357].
Mohlau's Anthradipyrazole Revisited: A New Look at an Old Molecular System
COMOTTI, ANGIOLINA;SOZZANI, PIERO ERNESTO;BASSANETTI, IRENE;NARDO, LUCA
2013
Abstract
Two polymorphs of 2,7-dihydrobenzo[1,2,3-cd:4,5,6-c′d′] diindazole ("dipyrazoloanthracene"; α and β; DBDI) were isolated and fully characterized by means of structural X-ray powder diffraction methods, thermal, and extended spectroscopic analyses. Different interconversion paths between the two species were evidenced. UV-vis absorption, emission, and excitation spectra were measured, while time-resolved fluorescence studies allowed for the detection of multiple decay processes. In the two species, NH···N hydrogen bonds give rise to manifestly different structures, which, in the rhombohedral β phase, generate permanent porosity. This feature has been further characterized by CO2/N2/CH4 sorption isotherms at different temperatures, highlighting a significant selectivity favoring CO2 trapping. © 2013 American Chemical Society.
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