Tunable Luminescent Properties of Tricyanoosmium Nitrido Complexes Bearing a Chelating O^N Ligand

Li Juan Luo, Qian Qian Su, Shun Cheung Cheng, Jing Xiang*, Wai Lun MAN, Wen Ming Shu, Ming Hua Zeng, Shek Man Yiu, Chi Chiu Ko, Tai Chu Lau

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We have recently reported a strongly luminescent osmium(VI) nitrido complex [OsVI(N)(NO2-L)(CN)3]- [HNO2-L = 2-(2-hydroxy-5-nitrophenyl)benzoxazole]. The excited state of this complex readily activates the strong C-H bonds of alkanes and arenes (Commun. Chem. 2019, 2, 40). In this work, we attempted to tune the excited-state properties of this complex by introducing various substituents on the bidentate L ligand. The series of nitrido complexes were characterized by IR, UV/vis, 1H NMR, and electrospray ionization mass spectrometry. The molecular structures of five of the nitrido compounds have been determined by X-ray crystallography. The photophysical and electrochemical properties of these complexes have been investigated. The luminescence of these nitrido complexes in the solid state, in a CH2Cl2 solution, and in a CH2Cl2 solid matrix at 77 K glassy medium clearly shows that these emissions are due to 3LML′CT [L ligand to OsN] phosphorescence. The presence of strongly electron-withdrawing substituents in these complexes enhances the LML′CT emission. Our result demonstrates that the excited-state properties of this novel class of luminescent osmium(VI) nitrido complexes can be fine-tuned by introducing various substituents on the bidentate L ligand.

Original languageEnglish
Pages (from-to)4406-4413
Number of pages8
JournalInorganic Chemistry
Volume59
Issue number7
DOIs
Publication statusPublished - 6 Apr 2020

Scopus Subject Areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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