4.7 Article

Understanding Mechanochromic Luminescence on Account of Molecular Level Based on Phosphorescent Iridium(III) Complex Isomers

Journal

INORGANIC CHEMISTRY
Volume 60, Issue 6, Pages 3741-3748

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c03515

Keywords

-

Funding

  1. China Postdoctoral Science Foundation [2019M651184]
  2. Fundamental Research Funds for the Central Universities [2412019FZ012, 2412019QD007]
  3. Science and Technology Project of Jilin Provincial Education Department [JJKH20201165KJ, JJKH20201167KJ]
  4. NSFC [52073045]
  5. Key Scientific and Technological Project of Jilin province [20190701010GH]
  6. Development and Reform Commis-sion of Jilin province [2020C035-5]
  7. National Natural Science Foundation of China [51902124]
  8. Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province
  9. Jilin Provincial Department of Education
  10. [BSKJ201832]

Ask authors/readers for more resources

Although some MCL-active iridium(III) complexes have been reported, the MCL mechanism is still unclear and requires further study. By comparing two new iridium(III) complex isomers, an extraordinary MCL mechanism has been presented for the first time.
Mechanochromic luminescent (MCL) materials are promising in pressure sensors, security papers, photoelectric devices and optical data recording. Although some kinds of MCL-active iridium(III) complexes with various soft substituent functional ligands (e.g., dendritic carbazole, flexible chains, and Schiff base ligands) were reported, the MCL mechanism is still not clear and mainly ascribes to the physical phase transformations from crystalline state to amorphous state in response to force stimulus at present stage, and deserves further study in order to obtain more intelligent MCL materials. Herein, two new iridium(III) complex isomers are tactfully constructed and show distinctly opposite MCL properties in spite of the same physical phase transformations happening on them. The absolutely out of the ordinary MCL mechanism has been presented on account of molecular level for the first time via the comparative study of photophysical properties based on isomers 1 and 2 with the help of crystal structure analysis, room/low temperature emission spectra, NMR, PXRD, and TD-DFT calculations. All of these results suggest that the emitting state dominated by the triplet charge transfer excited state (3CT) plays a key role in achieving mechanochromic luminescence in iridium(III) complex systems.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.7
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available