Specific guest orientation in guest–host association with a transition metal complex containing a permanent void

Abstract

¹ H N.m.r. longitudinal relaxation time measurements in aqueous solution are used to estimate distances from the protons of guest molecules to a paramagnetic copper(II) macrobicyclic complex whose ligand is known to facilitate O₂ binding to both Co¹¹ and Fe¹¹ while in addition being sufficiently spacious to accommodate a number of organic substrates for potential autoxidation.