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Tuning the porosity of triangular supramolecular adsorbents for superior haloalkane isomer separations.

ABSTRACT: Distillation-free separations of haloalkane isomers represents a persistent challenge for the chemical industry. Several classic molecular sorbents show high selectivity in the context of such separations; however, most suffer from limited tunability or poor stability. Herein, we report the results of a comparative study involving three trianglamine and trianglimine macrocycles as supramolecular adsorbents for the selective separation of halobutane isomers. Methylene-bridged trianglamine, TA, was found to capture preferentially 1-chlorobutane (1-CBU) from a mixture of 1-CBU and 2-chlorobutane (2-CBU) with a purity of 98.1%. It also separates 1-bromobutane (1-BBU) from a mixture of 1-BBU and 2-bromobutane (2-BBU) with a purity of 96.4%. The observed selectivity is ascribed to the thermodynamic stability of the TA-based host-guest complexes. Based on single crystal X-ray diffraction analyses, a [3]pseudorotaxane structure (2TA⊃1-CBU) is formed between TA and 1-CBU that is characterized by an increased level of noncovalent interactions compared to the corresponding [2]pseudorotaxane structure seen for TA⊃2-CBU. We believe that molecular sorbents that rely on specific molecular recognition events, such as the triangular pores detailed here, will prove useful as next generation sorbents in energy-efficient separations.

SUBMITTER: Hua B

PROVIDER: S-EPMC8480323 | biostudies-literature | 2021 Sep

REPOSITORIES: biostudies-literature

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Tuning the porosity of triangular supramolecular adsorbents for superior haloalkane isomer separations.

Hua Bin B Ding Yanjun Y Alimi Lukman O LO Moosa Basem B Zhang Gengwu G Baslyman Walaa S WS Sessler Jonathan J Khashab Niveen M NM

Chemical science 20210816 37

Distillation-free separations of haloalkane isomers represents a persistent challenge for the chemical industry. Several classic molecular sorbents show high selectivity in the context of such separations; however, most suffer from limited tunability or poor stability. Herein, we report the results of a comparative study involving three trianglamine and trianglimine macrocycles as supramolecular adsorbents for the selective separation of halobutane isomers. Methylene-bridged trianglamine, <b>TA< ...[more]

PMID: 34603658

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Tuning the porosity of triangular supramolecular adsorbents for superior haloalkane isomer separations.

Publications

Tuning the porosity of triangular supramolecular adsorbents for superior haloalkane isomer separations.

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