Design of Luminescent Isocyano Rhenium(I) Complexes : Photophysics and Effects of the Ancillary Ligands

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Ka-Ming Tong
  • Shun-Cheung Cheng
  • Chi-On Ng
  • Shek-Man Yiu

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)13963-13972
Journal / PublicationInorganic Chemistry
Volume57
Issue number21
Online published24 Oct 2018
Publication statusPublished - 5 Nov 2018

Abstract

Despite the well-reported MLCT [dπ(M) → π(CNR)] transitions in the isocyano transition metal complexes, emissive complexes with phosphorescence derived from MLCT [dπ(M) → π(CNR)] were not extensively studied. To provide insights into the design strategy of phosphorescent rhenium(I) complexes with an emissive 3MLCT [dπ(Re) → π(CNR)] excited state, a series of pentaisocyano rhenium(I) complexes have been synthesized. In contrast to most of the reported penta- or hexaisocyano rhenium(I) complexes with unsubstituted or alkyl- or monohalo-substituted phenylisocyanide ligands, which only exhibit photoluminescence in 77 K glassy medium, the solutions of all of these complexes were found to show phosphorescence at room temperature. Detailed study on their emission properties revealed that they are derived from the 3MLCT [dπ(Re) → π(CNR)] excited state mixed with LL′CT character. It has been shown that the strong electron-withdrawing substituents on the isocyanide ligands can lower the energy of the MLCT [dπ(Re) → π(CNR)] state and raise the deactivating ligand-field state. These effects are the crucial criteria to render the pentaisocyano rhenium(I) complexes emissive. Moreover, the emission properties in terms of energy, lifetime, and quantum yields can also be enhanced by the ancillary ligand.

Research Area(s)

  • EFFECTIVE CORE POTENTIALS, DIIMINE COMPLEXES, PHOTOREDOX CATALYSIS, MOLECULAR CALCULATIONS, DENSITY

Citation Format(s)

Design of Luminescent Isocyano Rhenium(I) Complexes : Photophysics and Effects of the Ancillary Ligands. / Chan, Kin-Cheung; Tong, Ka-Ming; Cheng, Shun-Cheung; Ng, Chi-On; Yiu, Shek-Man; Ko, Chi-Chiu.

In: Inorganic Chemistry, Vol. 57, No. 21, 05.11.2018, p. 13963-13972.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review