Complexation with (arene)ruthenium(II) units converts calix-arenes into suitable host compounds for anions. The hexacat-ion composed of calixarene 1 with four (p-cymene)Ru fragments bound to the phenyl groups can complex a BF ion, as demonstrated by X-ray structure analysis. The BF ion is found deep within the host cavity.
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Steed et al. (1995) studied this question.
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