Helicity Induction in Helicate Self-Organisation from Chiral Tris(bipyridine) Ligand Strands
作者:Wolfgang Zarges、Jonathan Hall、Jean-Marie Lehn、Carsten Bolm
DOI:10.1002/hlca.19910740827
日期:1991.12.11
The chiral tris, and pentakis(bipyridine) ligand strands 3a and 4 were synthesised, each in optically pure form with (S,S)-configuration. Ligand 3a yielded substituted double-helical metal complexes, derived from the parent trihelicate structure 2, with CuI and AgI ions. The spectral data, in particular the 1H-NMR spectra and the large positive Cotton effect, indicate that helicate formation occurs
合成了手性tris和五(联吡啶)配体链3a和4,它们各自为具有(S,S)构型的光学纯形式。配体3a产生取代的双螺旋金属配合物,其衍生自母体三螺旋结构2,具有Cu I和Ag I离子。光谱数据,特别是1 H-NMR光谱和大的正棉花效应,表明在非常高的螺旋诱导下发生了螺旋形成。并考虑两种可能的螺旋非对映异构体(P)-1中的空间效应以及可能形成的(M)-1,该数据有利于优先从(S,S)构型的三(联吡啶)链3a优先产生右旋双螺旋(P)-1。