Supramolecular design of coordination complexes of silver(I) and cadmium(II) with chiral bidentate bridging ligands

Two diastereopure ligands, N,N′-bis(4-pyridyl)idene(1R,2R)- diaminocyclohexane (L1) and N,N′-bis(3-pyridyl)idene(1R,2R)-diaminocyclohexane (L2), have been synthesized and characterized. The interaction of L1 with Ag(I) ions and L2 with Cd(II) ions has been investigated. The structure of {[Ag(L1)2](CF3SO3)·4H2O}n (1) exhibits a (4,4)-connected two-dimensional sheet with a corrugated surface and the complex [Cd(L2)2(NO3)(3H2O)]n·NO3·2H2O (2) forms an infinite single helical chain with a pitch of 47.25 Å. When viewed from the top of the chain, the infinite helical chain forms the wall of a hexagonal nanochannel with an opening of ∼1.2 × 1.2 nm.

Graphical abstractThe self-assembly of periodically ordered coordination polymers and interlocked homochiral nanochannels based on helical chains that are built from chiral rigid bidentate bridging ligands and linear metal-connecting points have been reported.Figure optionsDownload full-size imageDownload as PowerPoint slide