Abstract

[Pb(cis-anti-cis-dicyclohexyl-18-crown-6)(OH2)2][ClO4]2 was crystallized using a slightly modified literature method for the separation of dicyclohexyl-18-crown-6 isomers. It crystallizes in the monoclinic space groupP21/n witha=8.415(5),b=20.993(9),c=8.973(5) A, β=111.56(6)o, andD calc=1.84 g/cm3 for Z=2. The Pb2+ ion resides on a crystallographic center of inversion and is coordinated to the six crown ether donors and two axial water molecules in a hexagonal bipyramidal geometry. The Pb-O(etheric) distances range from 2.694(4) to 2.743(4) A while the Pb−OH2 distance is 2.522(6) A.

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