摘要:
The pseudo-square-planar complexes [Rh(cod)(Hbbtm)]BF4 (3), [Rh(bbte)(cod)]BF4 (4), [Rh(CO)2(Hbbtm)]BF4 (5), [Rh(bbte)(CO)(2)]BF4 (6), [Rh(bbtm)(cod)] (7) and [Rh(bbtm)(CO)(2)] (8) (Hbbtm=bis(benzothiazol-2-yl)methane=2,2'-methylenebis[benzothiazole], bbte=bis(benzothiazol-2-yl)ethane = 2,2'-(ethane-1,2-diyl)bis[benzothiazole], and cod = cycloocta-1,5-diene) were synthesized and characterized. Diastereotopic protons were observed for the protons at the bridge in the H-1-NMR of 3 and 5. Twisting of the ethane-1,2-diyl bridge in 4 and 6 effects chemical equivalence of the CH2 groups in solution. Unusually large downfield shifts occur on coordination of the deprotonated ligand Hbbtm as the negative charge is delocalized in 7 and 8. The NMR signals of the cod ligand in 4 could be differentiated. The X-ray crystal structures of 3, 4, and 6 are reported.