Cyclometalated iridium(III) and platinum(II) complexes are among the most promising phosphorescent emitters, and have found applications in organic light emitting diodes (OLEDs), and as chemical sensors and bioimaging labels.  Their luminescent properties can be finely tuned by modifying the coordination environment. In this presentation, a series of 2-(1,2,3-triazol-4-yl)-pyridine derivatives prepared by �click� chemistry have been used to synthesize a variety of Ir(III) and Pt(II) compounds with interesting photophysical properties. These �click� ligands show versatile coordination modes and can act as C, N- and N, N-chelating ligands as well as C, N, N-bridging units. The C, N- and C, N, N-ligation can only be achieved by capturing the Cu(I)-triazolide intermediates formed in the copper mediated 1,3-dipolar cycloaddition reactions as transmetalating reagents. The tolerant and robust nature of the �click� chemistry provides an ideal route to incorporate different functionalities. Most importantly, the switch in coordination modes is accompanied by significant change of the photophysical properties. For instance, the cationic Pt(II) complexes with N, N-chelating �click� ligands exhibit switchable emission colors in respond to mechanical force. Detailed synthesis, characterization, and photophysical properties of these complexes will be discussed.

Luminescent properties of iridium(III) and platinum(II) complexes based on “click” ligands with versatile coordination modes

243rd National Meeting (2012)

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