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Issue 10, 2014
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Pyridine imines as ligands in luminescent iridium complexes

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Biscyclometallated iridium complexes [Ir(ppz)2(X^Y)][PF6] (X^Y = pyridine imine) have been synthesised. The pyridineimine ligands are prepared in situ during the complexation. The complexes show room temperature emission between 640 and 780 nm in CH2Cl2 solution. The emission is red shifted compared with the analogous bipyridine complex [Ir(ppz)2(bipy)][PF6]. DFT calculations have been used to shed light on the influence of the imine substituent on the electrochemical and photochemical properties. In particular, the calculations suggests that there is a significant change in geometry between the ground state and the first triplet excited state for arylimines but not for alkylimines, leading to much weaker emission for the arylimine complexes. The work demonstrates that pyridineimines can be used as a substitute for bipyridines in luminescent iridium complexes.

Graphical abstract: Pyridine imines as ligands in luminescent iridium complexes

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The article was received on 22 Oct 2013, accepted on 05 Jan 2014 and first published on 13 Jan 2014

Article type: Paper
DOI: 10.1039/C3DT52975D
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Dalton Trans., 2014,43, 4026-4039

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    Pyridine imines as ligands in luminescent iridium complexes

    D. L. Davies, F. Lelj, M. P. Lowe, K. S. Ryder, K. Singh and S. Singh, Dalton Trans., 2014, 43, 4026
    DOI: 10.1039/C3DT52975D

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