Pal Deep Sankar, Kar Haridas, Ghosh Suhrit
Polymer Science Unit, Indian Association for the Cultivation of Science, 2A and 2B Raja S. C. Mullick Road, Kolkata, 700032, India.
Chem Commun (Camb). 2018 Jan 23;54(8):928-931. doi: 10.1039/c7cc08302e.
A naphthalene-diimide appended carboxylic acid either spontaneously self-assembles (P) by an open-chain H-bonding or can be arrested in an intra-molecularly H-bonded monomeric state (M) depending on the sample preparation method. Sonication of P produces a seed (S) that triggers controllable supramolecular polymerization (SP) of M via a chain growth route with first order kinetics, a tunable mesoscopic structure and a living nature as demonstrated by the chain-extension up to three cycles. SP of an achiral M, initiated by a chiral S, illustrates chiral amplification by the "sergeant and soldiers" effect.
根据样品制备方法的不同，一种萘二酰亚胺附加羧酸要么通过开链氢键自发自组装（P），要么可以被捕获在分子内氢键连接的单体状态（M）。对P进行超声处理会产生一个种子（S），该种子通过具有一级动力学、可调节介观结构和活性性质的链增长途径触发M的可控超分子聚合（SP），这一点通过多达三个循环的链延伸得到了证明。由手性S引发的非手性M的SP通过“士兵与长官”效应说明了手性放大。
