Abstract
A cavity that acts as a molecular funnel is formed from calix[6]arene 1 and [CuI (NCCH3 )4 ]PF6 [Eq. (a)]. An exchange of the well-protected acetonitrile ligand for other nitriles RCN is only possible with small R groups. The protection of the copper ions precludes oxidative dimerization; thus, the complexes mimic the mononuclear site of copper enzymes.
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