Syntheses and structures of bora-amidinate lanthanide(III) complexes.
The use and coordination modes of the dianionic bora-amidinate ligand in lanthanide(III) chemistry is explored. Synthetic routes to complexes of the type (DIPP)NBN-LnR (Ln = lanthanide, (DIPP)NBN = HB[N(2,6-iPr(2)-phenyl)](2), R = an amide or benzylide group) have been developed. The reaction of (DIPP)NBN-H(2) with (DMA)(3)Sm (DMA = 2-Me(2)N-benzyl) gave dark-red crystals of (DIPP)NBN-Sm(DMA) in 68% yield. The yttrium analogue, (DIPP)NBN-Y(DMA), was prepared similarly (yellow crystals, 58% yield). The reaction of (DIPP)NBN-Sm(DMA) with (Me(3)Si)(2)NH gave (DIPP)NBN-SmN(SiMe(3))(2).(THF)(2) (yellow crystals, 54% yield). Crystal structure determinations of (DIPP)NBN-Sm(DMA) and (DIPP)NBN-Y(DMA) revealed dimeric complexes that are held together by LnDIPP interactions. The complex (DIPP)NBN-SmN(SiMe(3))(2).(THF)(2) crystallized as a monomer. NMR investigations of [(DIPP)NBN-Y(DMA)](2) in benzene indicate that it is also dimeric in solution. The addition of THF resulted in its dissociation into monomeric units of (DIPP)NBN-Y(DMA).(THF)(x).
Harder
Sjoerd
S
Anorganische Chemie, Universität Duisburg-Essen, Universitätsstrasse 5, 45117, Essen, Germany. sjoerd.harder@uni-due.de