A simple Cu(II) complex, [Cu < sup > II < /sup > {C < inf > 6 < /inf > H < inf > 4 < /inf > (NH < inf > 2 < /inf > ) < inf > 2 < /inf > } < inf > 2 < /inf > (NO < inf > 3 < /inf > ) < inf > 2 < /inf > ] with an unprecedented hydrogen bonding supramolecular network in the solid state and its solution emission at room temperature in the visible region

Abstract

The compound [CuII{C6H4 (NH2)2}2(NO3)2], 1 has been prepared and characterized by spectroscopic methods and single crystal X-ray diffraction. 1 crystallizes in the orthorhombic space group Pcab (No. 61), with a = 7.905 (4) Å, b = 9.865 (7) Å, c = 20.621 (9) Å and Z = 4. The structure was solved by direct method and refined by full-matrix least-squares on F2 to R = 0.0351 for 1160 reflections with 1 > 2σ(I). In the crystal structure of 1, an extended hydrogen bonding network is formed involving copper coordinated amine and nitrato ligands. Compound 1 displays emission in solution at room temperature in the visible region furnishing the first example of an emissive transition metal complex, where the ligand is benzene-1,2-diamine (φcm = 0.095, τ = 2.97 ns). © 2002 Elsevier Science B.V. All rights reserved.