Add time:07/12/2019         Source:sciencedirect.com

Excimer formation from 1-PYRENEMETHANOL (cas 24463-15-8) (PyM) and several other pyrene derivatives is investigated in aqueous dispersions of polystyrene (PS) latex, as well as in homogeneous solutions. The efficiency of excimer formation is markedly enhanced on going from the homogeneous aqueous solutions to the particle surface in the presence of the PS latex. This is attributed to adsorption of the probes onto the latex surfaces. The peak height ratio between the excimer and monomer fluorescence bands (IE/IM) of PyM is measured as a function of the surface density of the probe. The ratio takes a maximum when the surface density is about 0.3 molecules nm−2. Analysis of various spectral and kinetic data suggest that the probes are inhomogeneously distributed on the latex surface and that a significant portion of the probes self-associate into ground state dimeric forms.

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