Abstract
Metal-cyclen (cyclen = 1,4,7,10-tetraazacyclododecane) complexes have attracted considerable attention as useful platforms for molecular receptors and supramolecules. Particularly, the derivatives with multiple ZnII–cyclen units are used as ligands to form artificial supramolecules. In this study, we characterized the crystal structure of p-xylyl doubly-bridged ZnII–cyclen: p,p-bis(ZnII–cyclen). The geometry around the zinc ions was a five-coordinated square pyramid. The distance of zinc ions in the p,p-bis(ZnII–cyclen) unit was 9.6915(5) Å. The p,p-bis(ZnII–cyclen) units were linked using nitrate ions to form a left-handed helix structure. Intramolecular CH-π interactions were observed in xylyl-bridge, cyclen, and xylyl-bridges of two neighboring p,p-bis(ZnII–cyclen) units. The left-handed helix structure differed from the capsule structure of m-xylyl doubly-bridged ZnII–cyclen; m,m-bis(ZnII–cyclen).
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