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By linking together two cyclometallated, N--C--N-coordinated platinum(II) complexes through a xanthene core, intense luminescence in the red region of the spectrum is achieved in solution at room temperature (lamda max = 690 nm, phi(lum) = 0.20, tau = 1.7 micros in CH2Cl2) due to the efficient formation of an intramolecular excimer.
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Develay et al. (2008) studied this question.
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