Tunable Phosphorescence in Metastable CuI Assemblies Prepared by Acid-Fueled Crystal-to-Crystal Conversion

被引：0

作者：

Fan, Jingyi ^{[1
]}

Gu, Zhuoya ^{[1
]}

Han, Xiao ^{[2
]}

Zhou, Xiuwen ^{[3
]}

Hou, Hong-Wei ^{[1
]}

Ding, Jie ^{[1
]}

机构：

[1] Zhengzhou Univ, Coll Chem, Green Catalysis Ctr, Zhengzhou 450001, Henan, Peoples R China

[2] Tianjin Inst Food Safety Inspect Technol, Tianjin 300308, Peoples R China

[3] Univ Queensland, Sch Math & Phys, Brisbane, Qld 4072, Australia

来源：

CHEMPHOTOCHEM | 2024年 / 8卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

metastable; Cu-I assembly; TTET; CT phosphorescence; LUMINESCENCE; SYSTEM; STATE;

D O I：

10.1002/cptc.202300305

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Acid acts as a "fuel" in driving kinetic self-assembly, with crystals of the Cu-II complex ([(CuCl2)-Cl-II(BH)(2)], BH = benzothiadiazole helicene derivative) being successfully converted to crystals of 1 ([H2BH][CuBr3]) and 2 ([H2BH][CuBr3<middle dot>2H(2)O]). The metastable features of 1 and 2 enable CuI guest release, with transformation into a thermodynamically favorable form 3 (H2BH<middle dot>2Br). Compound 1 exhibits dual phosphorescence at 452 nm ((MC)-M-3) and 709 nm ((CT)-C-3) at room temperature. At lower temperatures, the (CT)-C-3 band disappears and the (MC)-M-3 band weakens, while a new emission band at 621 nm ((3)pi pi*) is enhanced. In 1, the subtle structural change and significant emission change depending on temperature is reversible. In contrast, 2 exhibits only (MC)-M-3 emission at room temperature, with less efficient triplet-triplet energy transfer (TTET) below 250 K, and with residual (3)pi pi* emission occurring upon returning to room temperature, even after one week.

引用

页数：7