Iridium(III) Complexes Bearing Tridentate Chromophoric Chelate : Phosphorescence Fine-Tuned by Phosphine and Hydride Ancillary

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

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Author(s)

  • Jia-Ling Liao
  • Palanisamy Rajakannu
  • Shih-Hung Liu
  • Gene-Hsiang Lee
  • Pi-Tai Chou

Detail(s)

Original languageEnglish
Pages (from-to)8287-8298
Journal / PublicationInorganic Chemistry
Volume57
Issue number14
Online published3 Jul 2018
Publication statusPublished - 16 Jul 2018

Abstract

Functional 2-pyrazolyl-6-phenylpyridine chelates - namely, (pzpyphBu)H2 and (pzpyphCF)H3 2 and phosphines - are successfully employed in the preparation of emissive Ir(III) metal complexes, for which the reaction with phosphine such as PPh3, PPh2Me, and PPh2(CH2Ph) afford corresponding Ir(III) complexes [Ir(pzpyphBu)(PPh3)2H] (1a), [Ir(pzpyphCF)(PPh3 2R)2H] (2a-2c), R = Ph, Me, CH2Ph, which also show an equatorial coordinated hydride. In contrast, treatment with 1,2-bis(diphenylphosphino)benzene (dppb) and 1,2-bis(diphenylphosphino)ethane (dppe) yields the isomeric products [Ir(pzpyphBu)(dppb)H] (3a) and [Ir(pzpyphBu)(dppe)H] (3b), for which the distinctive, axial hydride undergoes rapid chlorination, forming chlorinated complexes [Ir(pzpyphBu)(dppb)Cl] (4a) and [Ir(pzpyphBu)(dppe)Cl] (4b), respectively. On the other hand, upon extensive heating of 2c, one of its coordinated PPh2(CH2Ph) exhibits benzyl cyclometalation and hydride elimination to afford [Ir(pzpyphCF)(PPh3 2R)(PPh2R′)] (5c and 6c) R = CH2Ph and R′ = CH2(o-C6H4) as the kinetic and thermodynamic products, respectively. Their structural, photophysical, and electrochemical properties are examined and further affirmed by the computational approaches.

Citation Format(s)

Iridium(III) Complexes Bearing Tridentate Chromophoric Chelate : Phosphorescence Fine-Tuned by Phosphine and Hydride Ancillary. / Liao, Jia-Ling; Rajakannu, Palanisamy; Liu, Shih-Hung; Lee, Gene-Hsiang; Chou, Pi-Tai; Jen, Alex K.-Y.; Chi, Yun.

In: Inorganic Chemistry, Vol. 57, No. 14, 16.07.2018, p. 8287-8298.

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