Self assembly of a 2D bilayer Cd(II)-organic framework with mixed nicotinate/dicyanoamide ligands

A novel 2D bilayer framework [Cd3(nta)4(dca)2(H2O)4]n (1) (HntaZnicotinic acid, HdcaZdicyanoamide) was obtained by slowly diffusion of a CdCl2 aqueous solution into a mixture of sodium dicyanoamide, Hnta and NaOH aqueous solution in a U-tube. The framework of 1 consists of a molecular ladder containing [Cd6(nta)6] rectangular metallomacrocyles, and the ladders are further linked by end-to-end dicyanoamide bridges to form a unique 2D bilayer framework. Supramolecular organization of p/p interaction between adjacent layers extends the 2D bilayer into a 3D network. Complex 1 is stable up to 315 8C and exhibits a strong fluorescent emission band at 580 nm (lexZ 314 nm) in the solid state. q 2004 Elsevier B.V. All rights reserved