Host–Guest Chemistry of 1D Suprachannels and
Dihalomethane Molecules: Metallacyclodimeric Ensembles Consisting
of Zinc(II)-2,7-bis(nicotinoyloxy)naphthalene
Complexes
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Abstract
Self-assembly
of ZnX<sub>2</sub> (X = Cl, Br, and I) with 2,7-bis(nicotinoyloxy)naphthalene
(L) as a hemicircular bidentate ligand containing a chromophore moiety
yields a systematic metallacyclodimeric unit, [ZnX<sub>2</sub>(L)]<sub>2</sub>. These basic skeletons constitute, via interdigitated π···π
interactions, a unique columnar ensemble forming a suprachannel. This
can then be employed as an unusual “diiodomethane within the
suprachannel” host–guest system, CH<sub>2</sub>I<sub>2</sub>@[ZnX<sub>2</sub>(L)]<sub>2</sub>. Specifically, the
suprachannel significantly stabilizes the CH<sub>2</sub>I<sub>2</sub> molecules in the order [ZnI<sub>2</sub>(L)]<sub>2</sub> > [ZnBr<sub>2</sub>(L)]<sub>2</sub> > [ZnCl<sub>2</sub>(L)]<sub>2</sub>. This
suprachannel has significant halogen effects on the photoluminescence
(PL), thermal properties, and host–guest inclusion