Coassembly of a Hexagonal Columnar Liquid Crystalline Superlattice from Polymer(s) Coated with a Three-Cylindrical Bundle Supramolecular Dendrimer
摘要:
The synthesis and structural analysis of a polymer containing twin-dendritic benzamide side-groups (i.e. poly(N-[3,4-bis(n-dodecan-1-yloxy)-5-(1-methacryloyl-n-undecan-1-yloxy)phenyl] -3,4,5-tris (n-dodecan-1-yloxy)benzamide)) (19) are described. The disc-like side groups of this polymer self-assemble into supramolecular cylindrical dendrimers through hydrogen bonding acting along the column long axis, creating a novel architecture consisting of a polymer chain(s) coated with a three-cylindrical bundle supramolecular dendrimer. This polymer self-organizes in a thermotropic nematic liquid crystalline (LC) phase. The low molar mass twin dendritic benzamide, 7-12/12, which has a similar structure to that of the polymer side groups, self-assembles into supramolecular cylindrical dendrimers, which self-organize on a two-dimensional hexagonal columnar (Phi(h)) LC lattice. Coassembly of the polymer 19 with 7-12/12 produces a novel two-dimensional Phi(h) LC superlattice. The mechanism responsible for this coassembly provides access to libraries of functional two-dimensionl Phi(h) superlattices.
一系列含有[Ru(C 5 H 5)(arene)] +的离子液体,其中的芳烃配体是1,2,3-C 6 H 3(OC n H 2 n +1)3和1,3,合成了5-C 6 H 3(OC n H 2 n +1)3(n= 6、12和18)。抗衡阴离子为PF 6和FSA(双(氟磺酰基)酰胺)。PF 6和FSA盐的熔点分别为33-93°C和-18-62°C。在PF 6中1,3-,5-衍生物的熔点比1,2,3-衍生物的熔点低28-55°C,而在FSA盐中未观察到这种趋势。X射线晶体学显示在固态的1,2,3-衍生物的PF 6盐中形成了层状结构。在这些晶体中,通常观察到通过C Cp H···F H键状相互作用的阳离子-阴离子对。几种1,3,5-衍生物显示出亚稳相,其熔点低于稳定相。还合成并表征了1,2,3-衍生物的盐(n = 2)。