A rare 4-connected neb topological metal-organic framework with ferromagnetic characteristics

A rare 4-connected neb framework has been constructed using a multi-carboxylic flexible ligand. It represents a unique 66 topology, which is evidently distinct from diamond and lonsdaleite topologies. In addition, the complex displays intriguing structural features of perpendicular right- and left-handed helical chains, as well as ferromagnetic interactions. Furthermore, the ferroelectric property is preliminarily discussed.