Behavior of pyrene end-labeled poly(dimethylsiloxane) polymer tails in mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethyl)sulfonylimide and toluen

Macromolecules

Volumn 38, Issue 20, 2005, Pages 8574-8582

  Gardinier, Wendy E ^a   Baker, Gary A ^a,c   Baker, Sheila N ^b   Bright, Frank V ^a  

^a UNIVERSITY AT BUFFALO   (United States)

^b LOS ALAMOS NATIONAL LABORATORY   (United States)

^c OAK RIDGE NATIONAL LABORATORY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EXCIMER-LIKE EMISSION; PHOTOEXCITATION; POLY(DIMETHYLSILOXANE) POLYMER; TIME-RESOLVED FLUORESCENCE;

ANISOTROPY; DIMERS; FLUORESCENCE; GROUND STATE; MIXTURES; MOLECULAR ORIENTATION; MONOMERS; SOLVENTS; TOLUENE;

ORGANIC POLYMERS;

EID: 26944454014     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma051313n     Document Type: Article

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61. In cases where a relatively small fluorescent probe is attached to a larger macromolecule, the observed steady-state fluorescence anisotropy from the probe results from a combination of local probe motion, segmental motion of a subregion of the entire macromolecule and the probe, and/or the global motion of the macromolecule. As a result, if there is local/segmental dynamics, which is likely here, the measured experimental steady-state fluorescence anisotropy is biased toward lower values in comparison to what the value would be if the probe did not undergo local/segmental motion. Thus, the steady-state anisotropy measurements tend to underestimate intermolecular association if the associating species are flexible, and the probe can undergo motion independent of the macromolecule.