Versatile cation complexation by a calix[4]arene tetraamide (L). Synthesis and crystal structure of [ML][ClO4]2·nMeCN (M = FeII, NiII, CuII, ZnIIor PbII)
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 8,p. 1273-1283
- https://doi.org/10.1039/dt9950001273
Abstract
Transition-metal complexes of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetrakis(diethylcarbamoylmethoxy)calix[4]arene (L) in the cone conformation have been synthesised for the first time. Single-crystal structure determinations have been carried out on the complexes of Fe2+, Ni2+, Cu2+ and Zn2+, as well as of Pb2+, the stoichiometry in each case being assigned as [ML][ClO4]2·nMeCN (n= 4–6). The structures of the complexes of Fe2+, Zn2+ and Pb2+ are broadly similar with the metal atoms co-ordinated to all eight oxygen atoms of L. The copper complex is somewhat different with the four Cu–O (amide) distances being very much shorter than the four Cu–O (ether) distances. A completely different structure is observed in the nickel complex, where L has undergone significant rearrangement to accommodate the metal cation in a distorted-octahedral environment. Molecularmechanics calculations have been carried out to investigate the remarkable versatility of L as a metal cation receptor.Keywords
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