1D hacksaw chain bipyridine–sulfonate Schiff base-dicopper(ii) as a host for variable solvent guests

Abstract

Syntheses, crystal structures and interconversion properties of the 1D coordination polymers [Cu₂L₂(bipy)]_n·2nMe₂SO (1), [Cu₂L₂(bipy)]_n·3nNH₂CHO·nH₂O (2), [Cu₂L₂(bipy)]_n·2nNH(Me)CHO (3), [Cu₂L₂(bipy)]_n·2nN(Me)₂CHO (4) and [Cu₂L₂(bipy)]_n·2nMeOH (5) (bipy = 4,4′-bipyridine) derived from the acyclic Schiff base o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H₂L) are described. Single-crystal X-ray diffraction analyses revealed their solvatomorph properties, featuring the formation of 1D polymeric chains with identical hacksaw patterns and adaptable host abilities, containing different guest solvent molecules. No amorphicity was detected upon desolvation of 1–5 and of the previously reported compound [Cu₂L₂(bipy)]_n·nN(Me)₂CHO (6), and these coordination polymers undergo reversible interconversion.