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Macrocycles within Macrocycles: Cyclen, Cyclam, and Their Transition Metal Complexes Encapsulated in Cucurbit[8]uril
Soo-Young Kim1, In-Sun Jung1, Eunsung Lee1
1National Creative Research Initiative Center for Smart Supramolecules and Department of Chemistry Division of Molecular and Life Sciences Pohang University of Science and Technology San 31 Hyojadong, Pohang 790-784 (Republic of Korea) Fax: (+82) 54-279-8129.
Abstract:
Reminiscent of Russian Matrioshka dolls, tetraazamacrocycles (1,4,7,10-tetraazacyclododecane (cyclen) and 1 , 4 , 8 , 11 - tetraazacyclotetradecane (cyclam)) and their transition metal complexes are encapsulated in the cavity of cucurbit[8]uril (CB[8]). The X-ray crystal structure of the [Cu(cyclen)] in CB[8] complex (see picture; copper: green, oxygen: red, nitrogen: blue, carbon: gray) reveals a five-coordinate CuII center in a square-pyramidal environment with a water molecule bound to the axial position.
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