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 5D0→7F3 transition and emission intensity of Sm3+ and Gd3+ increase due to the disturbance of binaphthol, meanwhile 5D4→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%.