M枚hlau鈥檚 Anthradipyrazole Revisited: A New Look at an Old Molecular System

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• 作者：Angelo Maspero ; Giovanni B. Giovenzana ; Norberto Masciocchi ; Giovanni Palmisano ; Angiolina Comotti ; Piero Sozzani ; Irene Bassanetti ; Luca Nardo
• 刊名：Crystal Growth & Design
• 出版年：2013
• 出版时间：November 6, 2013
• 年：2013
• 卷：13
• 期：11
• 页码：4948-4956
• 全文大小：507K
• 年卷期：v.13,no.11(November 6, 2013)
• ISSN：1528-7505

文摘

Two polymorphs of 2,7-dihydrobenzo[1,2,3-cd:4,5,6-c鈥?i>d鈥瞉diindazole (鈥渄ipyrazoloanthracene鈥? 伪 and 尾; 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鈥搗is 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路路路N hydrogen bonds give rise to manifestly different structures, which, in the rhombohedral 尾 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.