Selectivity for dinegative versus mononegative oxoanionic guests within a cryptand host

摘要

In the structures of three new oxoanion cryptates (M=Cr(VI), Se(VI) and SSO32-) of a protonated azacryptate host: H6L(MO42-)(ClO4)(4) the dinegative anion invariably occupies the crypt, providing evidence of selectivity with respect to the mononegative analogue; solution studies support this observation. [References: 14]