Synthesis,physicochemical properties and terahertz time domain spectroscopy of two lantha-nide(Eu,Tb)bisphosphonate complexes containing keggin polyoxometalates
Two novel lanthanide bisphosphonate complexes containing Keggin polyoxometalates[Eu(L)4]PW12O40· 2CH3CN(1)and[Tb(L)3(H2O)]PW12O40(2)(L=tetraethyl ethylenediphosphonate)were synthesized in a mixed solvent of acetonitrile and deionized water.The properties of the two complexes were characterized by single-crystal X-ray diffraction,elemental analysis,infrared spectroscopy,powder X-ray diffraction,thermogravimetric analysis and tera-hertz time domain spectroscopy.The crystal structure and intermolecular weak force of the complexes were ana-lyzed,and the luminescence and other properties of the complexes were studied.The single crystal X-ray diffraction indicates that the structure of complex 1 is a twisted tetragonal antiprism with Eu(Ⅲ)as the center and L as the ligands chelate.The structure of complex 2 is a twisted single-capped octahedral with Tb(Ⅲ)as the center and L and H2O as the ligands.The luminescence spectra indicate that all emission peaks of complexes 1 and 2 are due to charge transfer within the metal.In addition,terahertz time-domain spectroscopy has helped in the study of complex-es 1 and 2.CCDC:2321285,1;,2321286,2.
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