Magnetic and Luminescence Properties of 8-Coordinated Pyridyl Adducts of Samarium(III) Complexes Containing 4,4,4-Trifluoro-1-(naphthalen-2-yl)-1,3-butanedionate

A novel series of polypyridyl adducts, [Sm(ntfa)(3)(NN)] (2-4), with ntfa = 4,4,4-trifluorol-(naphthalen-2-yl)-1,3-butanedionate, NN = 2,2'-bipyridine (bipy), 4,4'-dimethyl-2,2'-bipyridine (4,4'-Me(2)bipy), and 5,5'-dimethyl-2,2'-bipyridine (5,5'-Me(2)bipy) were synthesized from the precursor complex [Sm(ntfa)(3)(MeOH) 2 ] (1) and the corresponding pyridyl ligands. Single X-ray crystallography showed that the complexes displayed 8-coordinated geometry. The solid pyridyl adducts 2-4 exhibited emission of luminescence in the NIR and visible regions with close quantum yields (QY = 0.20-0.25%). The magnetic data of 1-4 showed larger values than those expected for magnetically noncoupled Sm(III) complexes in the H-6(5/2) ground state, with no saturation on the applied high magnetic field static at a temperature of 2 K.

Automated summary

This article reports a novel series of polypyridyl adducts and analyzes their optical and magnetic properties. The experimental results show that these compounds have high quantum yields and no saturation at high magnetic fields.