Synthesis and structural characterisation of three dicyanamide complexes with Mn(II), Zn(II) and Cd(II): Supramolecular architectures stabilised by hydrogen bonding

Three new dicyanamido [N(CN)2]− (dca) compounds of the formula [Mn(ac)(tptz)(dca)(H2O)] · (H2O)2 (1), [Zn(tptz)(dca)2] · (H2O)2 (2) and [Cd2(tptz)2(dca)2(H2O)2] · (ClO4)2 (3), (where ac = acetate anion and tptz = 2,4,6-tris(2-pyridyl)-1,3,5-triazine) have been synthesised. X-ray diffraction analysis revealed that the manganese atom in 1 is seven-coordinated with a pentagonal-bipyramidal environment, in 2 zinc is penta-coordinated square pyramidal and in 3 the cadmium atom is six-coordinated octahedral. dca is found to act as an end-to-end bridging ligand in the dimer 3, whereas in 1 and 2 it acts as a monodentate terminal ligand. All the complexes exhibit supramolecular architectures by hydrogen bonding interactions involving lattice water (for 1 and 2) or coordinated water molecules (for 3).

Three new dicyanamide complexes with Mn(II), Zn(II) and Cd(II) have been synthesised at ambient temperature. Complexes 1 and 2 are mononuclear and 3 is a dicyanamide bridged dinuclear species, which is rare in the literature. All three structures exhibit supramolecular frameworks resulting from the numerous hydrogen bonding interactions involving the constituent materials.Figure optionsDownload as PowerPoint slide