posted on 2024-02-29, 17:40authored byJun-Jie Fang, Zheng Liu, Yang-Lin Shen, Zhi-Yi Wang, Yun-Peng Xie, Xing Lu
The
synthesis of chiral atomically precise metal clusters is hindered
by the challenge of achieving desirable crystallinity, and the investigation
of chiral alkynyl copper(I) halide compounds with circularly polarized
luminescence (CPL) responses remains a relatively unexplored area.
In this study, we successfully synthesized five gram-scale pairs
of enantiomers by utilizing chiral proparylbenzylamine ligands and
copper halides as precursors. Notably, these enantiomers incorporate
ionic, coordinate bonds, and C–H···π interactions
to significantly enhance their stability and crystallinity. Derived
from either Br– or I–, the enantiomers
exhibited distinct skeletal characteristics, resulting in four different
structural types. A thorough analysis was undertaken to elucidate
the origins of the chirality within each of these structural motifs.
Remarkably, all of the enantiomers displayed photoluminescence and
mirror-image circular dichroism (CD) responses. Of particular interest,
the one-dimensional (1D) compound R/S-1 exhibited pronounced CPL activities
and an anisotropy factor (glum) of ∼0.007
in its crystalline state. This investigation contributes to the understanding
of structure–property relationships in chiral compounds and
offers a new strategy for designing materials with targeted functionalities.