Synthesis, characterization and X-ray structural studies of three hybrid inorganic-organic compounds: Silver(I)-, lead(II)- and tris(phenanthroline) copper(II)-2,6-naphthalenedisulfonate (2,6-nds)

Three new hybrid inorganic-organic compounds of silver(I), Ag-2(2,6-nds), 1, lead(II), [Pb(2,6-nds)center dot H2O](n), 2 and copper(II), [Cu(phen)(3)](2,6-nds)center dot 11H(2)O, 3, have been synthesized by reacting appropriate reactants in aqueous medium. All the three compounds were characterized on the basis of elemental analyses, spectroscopic techniques (FT-IR, NMR, EPR and NIR-Vis-UV), thermogravimetric analyses and X-ray powder diffraction studies. Single crystal X-ray structure determination of compound 2 (Monoclinic, P 2(1)/c) revealed a polymeric structure in which lead(II) is seven coordinated by six sulfonato oxygen atoms and one oxygen atom of water molecule where as compound 3 (Triclinic, P (1) over bar) revealed the existence of discrete ions i.e. [Cu(phen)(3)](2+) cation, 2,6-naphthalenedisulfonate (2,6-nds) anion and eleven water molecules of crystallization. These water molecules in wide channels show intermolecular non-covalent interactions with disulfonate anion and [Cu(phen)(3)](2+) cationic layer, leading to crystal lattice stabilization. The d-d bands found in diffuse-reflectance electronic spectrum arise from (2)A(1g) (d(x2) (y2)) > (2)A(2g) (d(z2)) approximate to B-2(1g) (d(xy)) > B-2(2g) (d(xy)) approximate to B-2(3g) (d(yz)) transitions. A rare resolution of copper hyperfine splitting of powder EPR spectrum is observed only at low temperature. (C) 2015 Elsevier B.V. All rights reserved.