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Issue 14, 2017
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Efficiency of photoinduced electron transfer in mono- and di-nuclear iridium complexes: a comparative study

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Abstract

Iridium complexes have been recognized as the most widely used class of emitters because of their efficient spin–orbit coupling and hence relaxation of the spin selection rule. The strong phosphorescence of the Ir(III) complexes is induced by the triplet metal-to-ligand charge transfer (3MLCT). However, there are significant differences in the photophysical and electrochemical properties of the mono- and dinuclear Ir(III) complexes. Photoinduced energy and electron transfer (PET) is frequently observed in supramolecular Ir(III) cyclometalated complexes. Herein, we synthesized a mononuclear and a dinuclear Ir(III) complex ([Ir(ppy)2(fmp)][PF6] and [{Ir(ppy)2}2(H2bpib)][PF6]2, represented by 1 and 2 in the text, respectively) to compare their PET efficiencies. Spectroscopic and electrochemical studies reveal that 1 (consisting of a single iridium center) acts as a better electron donor as compared to 2 (consisting of two iridium centers) during PET.

Graphical abstract: Efficiency of photoinduced electron transfer in mono- and di-nuclear iridium complexes: a comparative study

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Publication details

The article was received on 28 Apr 2017, accepted on 02 Jun 2017 and first published on 05 Jun 2017


Article type: Paper
DOI: 10.1039/C7NJ01423F
Citation: New J. Chem., 2017,41, 6540-6545
  • Open access: Creative Commons BY-NC license
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    Efficiency of photoinduced electron transfer in mono- and di-nuclear iridium complexes: a comparative study

    S. Kanti Seth, P. Gupta and P. Purkayastha, New J. Chem., 2017, 41, 6540
    DOI: 10.1039/C7NJ01423F

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