Huang Xiao
2007
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Journal
Acta Physico-chimica Sinica
Abstract
A pair of novel chiral tetradentate bisferrocenyl ligands [N,N'-bisferrocenylmethyl-N,N'-bis(2-hydroproxypyl)-(1R,2R)-1,2-diphenylethane-diamine(5R),N,N'-bisferrocenylmethyl-N,N'-bis(2-hydroxypropyl)-(1S,2S)-1,2-diphenylethane diamine(5S)] were synthesized from ferrocenylcarboxaldehyde(1)and chiral 1,2-diphenylethane-diamine(2R or 2S)followed by the reduction of the Schiff bases with NaBH4 and subsequent N-alkylation with 1,2-propyleneoxide.All the chiral products(3R-5S)were charactered by elemental analysis,infrared(IR),1H nuclear magnetic resonance(1H NMR),ultraviolet-visible(UV-Vis)and solid-state circular dichroism(CD)spectra.The solid-state CD spectra reveal that the chiral characteristics of 5R(or 5S)are quite similar with 4R(or 4S)and it is also notable that there are some differences between 5R(or 5S)and 3R(or 3S).