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

Abstract Two diastereopure ligands, N,N′-bis(4-pyridyl)idene(1R,2R)- diaminocyclohexane ( L 1 ) and N,N′-bis(3-pyridyl)idene(1R,2R)-diaminocyclohexane ( L 2 ), have been synthesized and characterized. The interaction of L 1 with Ag(I) ions and L 2 with Cd(II) ions has been investigated. The structure of {[Ag( L 1 ) 2 ](CF 3 SO 3 )·4H 2 O} n ( 1 ) exhibits a (4,4)-connected two-dimensional sheet with a corrugated surface and the complex [Cd( L 2 ) 2 (NO 3 )(3H 2 O)] n ·NO 3 ·2H 2 O ( 2 ) forms an infinite single helical chain with a pitch of 47.25 A. 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.