A ferric guest inside a spin crossover ferrous helicate

A designed dimetallic Fe(ii) helicate made with biphenylene-bridged bispyrazolylpyridine ligands and exhibiting a process of spin crossover at temperatures above ambient is shown to encapsulate an S = 5/2 tris-oxalato Fe(iii) ion. The spin relaxation dynamics of this guest are strongly reduced upon encapsulation.

Automated summary

This article presents a designed dimetallic Fe(ii) helicate made with biphenylene-bridged bispyrazolylpyridine ligands, which exhibits spin crossover at temperatures higher than ambient. It is also demonstrated that this helicate has the ability to encapsulate an S = 5/2 tris-oxalato Fe(iii) ion, leading to a significant reduction in the spin relaxation dynamics of the encapsulated guest.