A simple Cu(II) complex, [Cu-II{C6H4(NH2)(2)}(2)(NO3)(2)] with an unprecedented hydrogen bonding supramolecular network in the solid state and its solution emission at room temperature in the visible region

The compound [Cu-II{C6H4(NH2)(2)}(2) (NO3)(2)] 1 has been prepared and characterized by spectroscopic methods and single crystal X-ray diffraction. I crystallizes in the orthorhombic space group Pcab (No. 61), with a = 7.905 (4) Angstrom, b = 9.865 (7) Angstrom, c = 20.621 (9) A and Z = 4. The structure was solved by direct method and refined by full-matrix least-squares on F-2 to R = 0.0351 for 1160 reflections with I > 2sigma(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 (phi(em) = 0.095, tau = 2.97 ns). (C) 2002 Elsevier Science B.V. All rights reserved.