An Unprecedented Homochiral Metal–Organic Framework Based on Achiral Nanosized Pyridine and V‑Shaped Polycarboxylate Acid Ligand

A unique homochiral metal–organic framework has
been successfully synthesized by solvothermal reaction of an achiral
flexible V-shaped ligand and a nanosized π-electron-deficient
pyridine ligand based on cobalt­(II) salt, [Co­(L)­(DPNDI)0.5]n (1) (H2L =
4,4′-dicarboxydiphenylamine, DPNDI = N,N′-di-(4-pyridyl)-1,4,5,8-naphthalenediimide); the
helixes assembled by H2L and cobalt­(II) paddle-wheel centers
are left-handed and transform the framework to chiral. Also, the
inserting of the DPNDI transforms the original dia net
constructed by H2L and cobalt­(II) paddle-wheel centers
to a 3-fold jsm net. This is the first example of interpenetrated jsm net. In addition, the chiral property of bulk products
is confirmed by circular dichroism spectra (CD), and the thermal stability
and the magnetic properties are also investigated.