Binaphthol Synthesis Of Rare Earth Complexes In A Catalytic Reaction

All experimental operations were carried out under the conditions of moisture and oxygen-free in nitrogen stream (99.99%). The solvents used were dewatered and deoxygenated and distilled prior to use. Anhydrous LnX3 was prepared by the method described in literature. The synthesis and characterization of novel enantiopure (1-6), {[(THF)2Na]3[Ln(BINOLate)3]} (Ln = Sm (1), Gd (2)), {[(THF)2Na]3[Ln(R-BINOLate)3]} (Ln = Sm (3, 5), Gd (4, 6)), are described. These complexes were firstly synthesized by the reaction of anhydrous LnBr3 with chiral (R)-BINOL in tetrahydrofuran at room temperature and were characterized by elemental analysis, IR and UV. Luminescence. Recrystallization of the complexes from THF/hexane led to monocrystals complexes crystallizes in the hexagonal space group P63.The analysis of fluorescent shows that complex exhibits pink luminescence. The reason is that 5D0â†'7F3 transition and emission intensity of Sm3+ and Gd3+ increase due to the disturbance of binaphthol, meanwhile 5D4â†'7F6, transition and emission intensity of Sm3+ or Gd3+ decrease. Thus the construction of spectrum can be changed through choosing different ligand.{[(THF)2Na]3[Ln(R-BINOLate)3]}(Ln= Sm, Gd) were used in asymmetric hydrogen transfer reaction of acetophenone and in a high e.c. up to 94%.