Emission properties of Sm(III) complex having ten-coordination structure

Sammarium(III) complex having ten-coordination structure, bis-(1,10-phenanthroline)tris-(hexafluoroacetylacetonato)samarium(III) (Sm(hfa)3(phen)2) was prepared by chelation of tris-(hexafluoroacetylacetonato) samarium(III) (Sm(hfa)3(H2O)2) with 1,10-phenantroline (phen). The characteristic ten-coordination structure of Sm(hfa)3(phen)2 was determined by 1H NMR and elemental analyses. Strong deep-red emission (λmax=643 nm) and narrow emission band (FWHM=5 nm) of Sm(hfa)3(phen)2 originated from electronic allowed transition from characteristics ten coordinate structure. The emission quantum yields Sm(hfa)3(phen)2 excited at absorption bands of ligands and Sm(III) ion were found to be 0.36 and 1.4%, respectively.