Frontispiece: Controlled Self-assembly of Gold(I) Complexes by Multiple Kinetic Aggregation States with Nonlinear Optical and Waveguide Properties |
| |
Authors: | Zongshang Li Dr Ke Xiao Dr Qingyun Wan Rui Tang Dr Kam-Hung Low Prof Xiaodong Cui Prof Chi-Ming Che |
| |
Institution: | 1. Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China;2. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China |
| |
Abstract: | Introduction of multiple kinetic aggregation states (Aggs) into the self-assembly pathway could bring complexity and flexibility to the self-assemblies, which is difficult to realize due to the delicate equilibria established among different Aggs bonded by weak noncovalent interactions. Here, we describe a series of chiral and achiral d10 AuI bis(N-heterocyclic carbene, NHC) complexes, and the achiral complex could undergo self-assembly with multiple kinetic Aggs. Generation of multiple kinetic Aggs was realized by applying chiral or achiral seeds exhibiting large differences in elongation temperatures for their respective cooperative self-assembly processes. We further showed that the chiral AuI self-assemblies having non-centrosymmetric packing forms exhibit nonlinear optical response of second harmonic generation (SHG), while the SHG signal is absent in the achiral analogue. The crystalline achiral AuI self-assemblies could function as optical waveguides with strong emission polarization. |
| |
Keywords: | Gold Photonic Properties Self-Assemblies Supramolecular Chemistry Supramolecular Chirality |
|
|