Charge-assisted phosph(v)azane anion receptors†
Abstract
Coordination of Cu(I) or Pd(II) to seleno-cyclodiphosph(V)azanes of the type [RNH(Se)P(μ-NtBu)]2 results in positively charged anion receptor units which have increased anion affinity over the neutral seleno-phosph(V)azanes, due to the increase in electrostatic interactions between the receptor and the guest anions. The same effect is produced by replacement of one of the PSe units by a P–Me+ unit.