Spin transition triggered by desorption of crystal solvents for a two-dimensional cobalt(II) complex with hydrogen bonding

[(Co(5tpybNOH)(2)](BPh4)(2) (1; 5tpybNOH = 5,5 ''-bis(N-tent-butyl hydroxylamino)-2,2':6',2 ''-terpyridine) has a two-dimensional (2D) structure through a hydrogen bond between the NOH sites, as revealed by X-ray crystallography. The crystal solvents were desorbed above 300 K as shown by thermal analyses and powder X-ray crystallography. The removal of the crystal solvents allowed irreversible structural changes and a spin transition of the Co centre from S =1/2 to 3/2.

Automated summary

The compound [(Co(5tpybNOH)(2)](BPh4)(2) has a two-dimensional structure formed by hydrogen bonds between NOH sites, with crystal solvents desorbed above 300K leading to irreversible structural changes and a spin transition in the Co center from S = 1/2 to 3/2.