Synthesis and Properties of New Alkyl Alanine Dipeptides Based on Difluoroboron β‐diketonates

Abstract

Based on difluoroboron β‐diketonates, four novel alanine dipeptides C10H21CO‐Ala‐Ala‐O‐Br‐BF2DPh (4) with long alkyl chains were prepared and characterized. UV and emission in different solvents and in the solid states are studied. The self‐assembly behaviors are investigated by FE‐SEM, CD, and FTIR spectra, and different stereochemical structures are proposed. Hydrogen bonding, π–π interactions, and electrostatic interactions are believed to be the driving force for the molecular organizations. The handedness of twisted nanostructures is found to be related to chirality of the amino acid near the alkyl chain.

Tuning the circularly polarized luminescence of polymer-stabilized cholesteric liquid crystal films using chiral dopants

“…45 Then, the target boron complex TPE-BF 2 acac-MeIP was achieved by the reaction of TPE-acac-MeIP ligand with BF 3 ·Et 2 O in CH 2 Cl 2 (yield: 91%). 46,47 These compounds were characterized using FT-IR, NMR and HRMS. Suitable single crystals for the X-ray crystallographic analysis of compound TPE-BF 2 acac-MeIP were obtained by the slow evaporation of CH 3 CN/EtOAc (v/v, 1/1) solutions.…”