Sheltering under the roof: A trisimidazolium cage is capped with a {FeII(bpy)3}2+ subunit to produce a receptor that can bind small anions (bpy=2,2′-bipyridine). Rodlike “pseudohalide” (N3−, NCO−, and NCS−) and spherical halide (Cl−, Br−, and I−) anions accept hydrogen bonds from CH fragments in the receptor cavity. The N3− ion forms the most stable inclusion compound (see structure; Fe red, C light blue, H white, N dark blue).
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Amendola et al. (2006) studied this question.
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