Two heterometal-organic coordination polymers with chelidamic acid: Syntheses, structures and optical properties

摘要

Two heterometal-organic coordination polymers with chelidamic acid ligands, [AgNd(C_7H_3NO_5)_2·3H _2O]_n (1) and 0.75H_3O·[K _(0.25)Nd(C_7H_3NO_5)_2· 3H_2O]·1.75H_2O (2), have been synthesized and characterized by X-ray single-crystal diffraction. The crystal structure of 1 features that chelating units composed of one Nd(III) ion and two tridentate chelating chelidamic acid ligands are connected by the Ag(I) ions to form a one-dimensional chain, further linked by hydrogen bonds into a 3D network. As for 2, discrete independent molecules, made up of Nd(III) and K(I) ions and chelidamic acid ligands, are linked through the hydrogen bonds to form a 1D chain, which are further inter-linked through the complex hydrogen bonds to form a 3D network. The optical properties of 1 and 2 were investigated in terms of fluorescent spectra, which both exhibit good luminescence.