The crystal structure of cryptand L was determined via X-ray diffraction analysis.Four solid(cryptates) of cryptand(L) with M(Ⅲ) nitrates(M=Sm,Eu,Tb,Dy) were prepared and characterized by means of fluorescence spectroscopy.The fluorescence properties of those complexes show that all the cryptates have stronger luminescence intensity.That the complex of Eu(Ⅲ) has the strongest luminescence intensity(among) them shows that the cryptand′s triplet state energy matches with the vibration energy level of Eu(Ⅲ).The difference between fluorescence intensities of L cryptates and other series of cryptates implies that the (energy) transfer from L is more effective in fluorescence and antenna when L has a more flexibility structure.
A series of lanthanide(Ⅲ) complexes of 6-methylpicolinic acid N-oxide(HL) have been synthesized and characterized by elemental analysis, molar conductance, IR, UV spectra and fluorescence spectrum measurements. The compositions of the complexes have been determined as Ln2L6. n H2O(Ln = La, Sm, Eu, Gd, Tb, Dy, n = 6; Ln = Lu, n = 9 ). The complexes with Sm, Eu, and Tb have characteristic line fluorescence emission spectra.
