MOLECULAR RECOGNITION OF AN ORGANIC MOLECULE THROUGH A TWO DIMENSIONAL SQUARE NETWORK INCLUSION COMPLEX. SYNTHESIS AND CRYSTAL STRUCTURE OF [Cd(4,4′-bpy)2(H2O)2] (BF4)2 · 2(4,4′-bpy) · (C6H6N2O2) · 2H2O

Abstract

The 2D square network complex [Cd(4,4′-bpy)2(H2O)2] (BF4)2 · 2(4,4′-bpy) · (C6H6N2O2) · 2H2O (1) (where 4,4′-bpy = 4,4′-bipyridine and C6H6N2O2 = o-nitrobenzenamine) has been prepared by reaction of Cd(BF4)2 · 6H2O and 4,4′-bpy in the presence of o-nitrobenzenamine. High shape selectivity was observed in this self-assembly process. Single crystal X-ray analysis revealed that 1 possesses a 2D square network of [Cd(4,4′-bpy)2(H2O)2] cations, which are made up of layers stacked upon each other. The o-nitrobenzenamine molecule is 2-fold disordered over a centre of inversion in the same plane as the cationic network. Uncoordinated 4,4′-bpy molecules as well as uncoordinated water molecules and BF4 − counter anions are intercalated between the cationic network layers. Extensive hydrogen-bonding is observed to stabilize this crystal packing.