Organometallics
Organometallics
5 years ago

A C-Pyrenyl Poly(methylenephosphine): Oxidation “Turns On” Blue Photoluminescence in Solution and the Solid State

A C-Pyrenyl Poly(methylenephosphine): Oxidation “Turns On” Blue Photoluminescence in Solution and the Solid State
Marc R. MacKinnon, Brian O. Patrick, Graham J. Bodwell, Benjamin W. Rawe, Derek P. Gates, Christopher M. Brown
A C-pyrenyl poly(methylenephosphine) (Mn = 4800, Đ = 1.56) was synthesized from the anionic polymerization of a P-mesityl phosphaalkene. The phosphine oxide polymer exhibits blue fluorescence in solution (λmax 379, 400 nm, λonset 560 nm; Φ = 0.05) and blue-green fluorescence in the solid state at room temperature (λmax 460 nm, Φ = 0.07). In contrast, unoxidized polymer displays only a weak emission in solution and no emission in the solid state. Fluorescence studies of partially oxidized polymers (50, 75, 83% oxidation) indicate that “turn on” emission occurs only at very high degrees of oxidation (near 100%). We conclude that even a small number of unoxidized phosphine moieties within the partially oxidized polymer intramolecularly quench the fluorescence.

Publisher URL: http://dx.doi.org/10.1021/acs.organomet.6b00880

DOI: 10.1021/acs.organomet.6b00880

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