Complexes of La(III),Sm(III),Tb(III),Dy(III),Ho(III) and Er(III) Ions with Morin

摘要

New solid complex compounds of La(III),Sm(III),Tb(III),Dy(III),Ho(III) and Er(III) ions with morin were obtained.They were characterized by elemental analysis,thermo-gravimetric studies and spectrophotometric determination of metal ions.The molecular formulae of the compounds are:Ln(C_(15)H_9O_7)_3o nH_2O,where n=6 for La,Sm,Tb,Dy and n=5 for Ho and Er.Low molar conductances of the complexes (which correspond to non-electrolytes) and the pi-pi bands of ligand and the CT bands L->M in UV-VIS spectra of the methanol solutions of the complexes were established.On the basis of ~(13)C NMR and IR spectra,it was supposed that morin was bound to the lanthanide ions via C(4)=O and C(3)-oxygen.