Uranium(IV)-crown-ether complexes and cryptates. 1H Nuclear magnetic resonance study, and X-ray crystal and molecular structure of tetrachloro-(2,5,8,15,18,21-hexaoxatricyclo[20.4.0.09,14]hexacosane)uranium(IV)

Abstract
1 H N.m.r. evidence for direct co-ordination of uranium to the oxygen atoms in a new UCl4-dicyclohexyl-18-crown-6 complex is confirmed by an X-ray structural determination; several uranium(IV) salt–crown-ether complexes and cryptates also exhibiting very large n.m.r. shifts are reported.

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