Four novel lanthanide(III) coordination polymers with 3D network structures containing 2-fold interpenetration

摘要

Four novel lanthanide(III) coordination polymers [Ln(L)_(1.5)(H2O)2]·5H2O [Ln = Sm (1), Eu (2), Tb (3), Dy (4)] have been hydrothermally synthesized by the reaction of 1,2-bis[4-arnino-5-carboxylrnethylthio-( 1,2,4-triazol-3-yl)]ethane (H2L) with lanthanide(III) salts, and structurally characterized by single crystal X-ray diffraction. Polymers 1-4 are isostructural, in which all the Ln~(III) atoms are nine-coordinated and the car-boxylate groups adopt three different coordination modes (bidentate chelate, bidentate bridging, biden-tate chelate bridging) to connect Ln~(III) atoms. These polymers exhibit 3D network structures with 2-fold interpenetration, in which intriguing 1D channels are observed. Besides, the spectra properties of the title polymers are investigated, the strong luminescence characteristics of 2-3 are found.