Affiliation:
1. Tianjin Key Laboratory of Structure and Performance for Functional Molecules College of Chemistry Tianjin Normal University No. 393, Binshui West Road Tianjin 300387 P. R. China
2. School of Chemical Engineering Qinghai University Xining 810016 P. R. China
Abstract
AbstractA nonplanar phenothiazine derivative with three cyano moieties (PTTCN) is designed and synthesized to achieve functional crystals for absorptive separation of benzene and cyclohexane. PTTCN can crystallize into two kinds of crystals with different fluorescence colors in different solvent systems. The molecules in two crystals are in different stereo isomeric forms of nitrogen, quasi axial (ax), and quasi equatorial (eq). The crystals with blue fluorescence in ax form may selectively adsorb benzene by a single‐crystal‐to‐single‐crystal (SCSC) transformation, but separated benzene from a benzene/cyclohexane equimolar mixture with a low purity of 79.6%. Interestingly, PTTCN molecules with eq form and benzene co‐assembled to construct a hydrogen‐bonded framework (X‐HOF‐4) with S‐type solvent channels and yellow‐green fluorescence, and can release benzene to form nonporous guest‐free crystal under heating. Such nonporous crystals strongly favor aromatic benzene over cyclohexane and may selectively reabsorb benzene from benzene/cyclohexane equimolar mixture to recover original framework, and the purity of benzene can reach ≈96.5% after release from framework. Moreover, reversible transformation between the nonporous crystals and the guest‐containing crystals allows the material to be reused.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
6 articles.
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