Citation: Dongheng WANG, Si LI, Shuangquan ZANG. Construction of chiral alkynyl silver chains and modulation of chiral optical properties[J]. Chinese Journal of Inorganic Chemistry, ;2025, 41(1): 131-140. doi: 10.11862/CJIC.20240379 shu

Construction of chiral alkynyl silver chains and modulation of chiral optical properties

College of Chemistry, Zhengzhou University, Zhengzhou 450001, China

Corresponding author: Si LI, lisi@zzu.edu.cn Shuangquan ZANG, zangsqzg@zzu.edu.cn
Received Date: 21 October 2024
Revised Date: 9 December 2024

Figures(6)

Based on the chiral ligand-induced strategy, three pairs of green-emitting chiral alkynyl silver chains {[Ag₁₀(bpy)₁₀(L/D-1)₄](ClO₄)₆·H₂O]}_n (L/D-Ag₁₀-1), {[Ag₁₀(bpy)₁₀(L/D-2)₄](ClO₄)₆·3CH₃OH}_n (L/D-Ag₁₀-2), and {[Ag₁₀(bpy)₁₀(L/D-3)₄](ClO₄)₆}_n (L/D-Ag₁₀-3) were successfully obtained by reacting three pairs of aromatic alkyne ligands with different terminal groups [4-ethynyl-2R-isoindoline-1, 3-dione, R=1-hydroxy-2-propyl (L/D-1), 1-hydroxy-3-methyl-2-butyl (L/D-2), 2-hydroxy-1-phenylethyl (L/D-3)], and 2, 2′-bipyridine (bpy) with silver perchlorate (AgClO₄). The crystal structure was determined by single-crystal X-ray diffraction (SCXRD), and the molecular formula composition was demonstrated by thermogravimetric analysis (TGA), elemental analysis (EA), and ¹H NMR. By circular dichroism (CD) and circularly polarized luminescence (CPL) spectroscopy, it was demonstrated that the design approach using a chiral alkyne-based ligand in combination with an Ag(Ⅰ) was effective in inducing chirality in the polymer. Interestingly, the degree of distortion of the polymer backbone as well as the interchain interactions were significantly increased with the increase of the spatial site resistance of the terminal group of the alkyne-based ligand, which was accompanied by a gradual increase in the values of the absorption asymmetry factor (g_abs) and the luminescence asymmetry factor (g_lum). In addition, L/D-Ag₁₀-2 exhibited obvious aggregation-induced luminescence in the DMF-H₂O system through the dissolution-reassembly strategy, and the new aggregates showed obvious enhancement of the chiral optical properties, with the |g_abs| and |g_lum| values of the aggregates being 74.6 times and 12.5 times higher than those of the crystalline state.
- one-dimensional structure,
- alkynyl silver,
- chirality,
- photoluminescence
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