Anion inclusion within the cavity of π-metalatedp-t-butylcalix[5]arene

Abstract
The X-ray crystal structure of the triiridium p-t-butylcalix[5]arene host molecule [{Ir(η5-C5Me5)}3(p-t-butylcalix[5]arene-H)][BF4]5 5 reveals the deep inclusion of one of the BF4 anions within the bowl shaped cavity of the macrocycle.

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