Two Homochiral Bimetallic Metal–Organic Frameworks Composed of a Paramagnetic Metalloligand and Chiral Camphorates: Multifunctional Properties of Sorption, Magnetism, and Enantioselective Separation

Two
porous metal–organic frameworks [Co­(Tt)2]­[Cu4(D-cam)4]·5H2O·DMF (1; Tt = tris­(triazolyl)­borate, D-H2cam = d-(+)-camphoric acid or (1R,3S)-1,2,2-trimethyl-1,3-cyclopentane­dicarbox­ylic acid)
and [Co­(Tt)2]­[Cu4(L-cam)4]·5H2O·2DMF (2; L-H2cam = l-(−)-camphoric acid or (1S,3R)-1,2,2-trimethyl-1,3-cyclo­pentane­dicarbox­ylic
acid) were prepared by mixing Cu2+, Co­(Tt), and camphoric
acid under solvothermal conditions. The structures of 1 and 2 reveal that the two-dimensional layers composed
of chiral ligands and Cu-Cu paddlewheel units are connected through
the metalloligands to form three-dimensional networks. It is noted
that these solids show multi­functional properties such as gas
adsorption onto the pores of the frameworks, antiferromagnetic coupling
between spin carriers, and a small enantioselective separation of
racemic alcohols.