Calix[4]arene-based triple helicates take up an achiral part of chiral guests; the chiral center outside the cavity causes the asymmetric induction of their supramolecular helicity.
钙[4]炔基三重螺旋体占用了手性客体的非手性部分;空腔外的手性中心导致其超分子螺旋性的不对称感应。
Majority-Rules Effect and Allostery in Molecular Recognition of Calix[4]arene-Based Triple-Stranded Metallohelicates
triple‐stranded metallohelicates 1 a,/1 b–3 a/3 b possessing internal guestbinding cavities surrounded by calix[4]arene units were synthesized through coordination‐driven self‐assembly. UV/Vis titration experiments verified that the metallohelicates encapsulated N‐methyl pyridinium cations bearing amino acid groups to form host–guest complexes. The guest chirality was transferred to the helicity of the helicates
通过配位驱动自组装法合成了具有内部客体结合腔并被杯[4]芳烃单元包围的三链金属螺旋化合物1 a,/ 1 b – 3 a / 3 b。UV / Vis滴定实验证实,金属螺旋包封了带有氨基酸基团的N-甲基吡啶鎓阳离子,形成了客体-客体复合物。客体手性通过氨基酸基团的立体中心与金属核之间的空间接触而转移至螺旋的螺旋。的(中号)螺旋性诱导当客人([R )- 4- - ([R )- 6被安置在空腔中。自组装helicates内的多个客户络合2和3显示的大的正协同效应,表明第一个客人络合preorganizes空腔的其余部分,以促进随后的客人结合。这种合作性导致手性客体结合2 a和3 a的多数规则效应。
Guest induced head-to-tail columnar assembly of 5,17-difunctionalized calix[4]arene
Calix[4]arenes often form dimeric capsules or up-down bilayer arrangements in the solid state. The head-to-tail polymeric columnar structure found in the cocrystals composed of 5,17-difunctionalized calix[4]arene 1 and organic guests represents another structural motif for calix[4]arenes.