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Minor modifications afford improved host selectivities in xanthenyl-type host systems


In this work, we examine the selectivity of host N,N'-bis(9-phenyl-9-xanthenyl)ethylenediamine in the presence of two different guest series’, namely the C8 aromatic fraction of crude oil (i.e., ethylbenzene, and o-, m- and p- xylene) and anisoles (anisole, and o-, m- and p- methylanisole). Of the four alkyl aromatics, only p-xylene formed a complex with this host when it was recrystallized from each one, while both anisole and p-methylanisole from the second guest series were clathrated in this way. Host:guest ratios were consistently 1:1. When this host was recrystallized from various mixtures of the solvents from the two guest groups, an unequivocal bias towards p-xylene and p-methylanisole, respectively, was observed, with the other competing guests essentially being excluded from the host crystal in these experiments. Furthermore, this host displayed significantly enhanced selectivities relative to the structurally-related compound, N,N'-bis(9-phenyl-9-thioxanthenyl)ethylenediamine, in the presence of the xylenes and ethylbenzene, when considering a previous report. The latter compound was also assessed for inclusion behaviour in the presence of the anisoles and, once more, its inferior selectivity compared with the oxo-host counterpart was strikingly evident. Both single crystal X-ray diffraction and thermal experiments were conducted in order to investigate the noted selectivity differences.

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Publication details

The article was received on 25 Feb 2019, accepted on 12 Apr 2019 and first published on 12 Apr 2019

Article type: Paper
DOI: 10.1039/C9CE00265K
Citation: CrystEngComm, 2019, Accepted Manuscript

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    Minor modifications afford improved host selectivities in xanthenyl-type host systems

    B. Barton, L. de Jager and E. C. Hosten, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE00265K

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