Abstract
The 1,3-bis(carboxymethyl)imidazolium salt (zwitterion) (HBCI) was reacted, under solvothermal conditions, with rare earth chlorides to provide a series of new two-dimensional (2D) coordination polymers, namely [LnBCI) (HCOO) (H2O)2Cl]n [Ln = Sm (1); Eu (2); Gd (3); Tb (4); Dy (5)]. The complexes were characterized by X-ray single crystal diffraction, powder X-ray diffraction, infrared spectroscopy, elemental analysis and thermogravimetric analysis. Compounds of 1, 2, 4 and 5 exhibit the characteristic luminescence of the corresponding lanthanide ions, due to the 4fn-4fn transition. Furthermore, the fluorescence lifetime of 2 and the phosphorescence spectrum of 5 at 77k are discussed.
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