Synthesis, Crystal Structure and Properties of [Nd(C_6NO_2H_5)_3(H_2O)_2]_(2n) centre dot (nH_5O_2)(nHgCl_5)(2nHgCl_4) centre dot (nH_2O) with Unprecedented Polycationic Chains

摘要

A novel inorganic-organic hybrid complex, [Nd(C_6NO_2H_5)_3(H_2O)_2]_(2n) centre dot (nH_5O_2)(nHgCl_5)(2nHgCl_4) centre dot (nH_2O) (1), was obtained by hydrothermal reactions and structurally characterized by X-ray diffraction. The unit cell parameters are as follows: a = 9.579(1), b = 21.462(2), c = 15.801(1) A, p = 102.339(6)°, V= 3173.5(5) A~3, Z= 4, space group P2_1/c. The crystal structure analysis reveals that the title complex is characteristic of a novel polycationic [Nd(C_6NO_2H_5)_3(H_2O)_2]_(2n)~(6n+) one-dimensional chain-like structure. Photoluminescent investigation shows that the title complex displays strong emission in blue region, which is attributed to the intraligand π-π*-transition of nicotinic ligands. Optical absorption spectra of 1 reveal the presence of an optical gap of 3.45 eV.