Fluorescence quenching and electron transfer in poly(methacrylic acid) with covalently bound anthracenes

Journal Article · Thu Mar 09 04:00:00 EST 1989 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100342a046· OSTI ID:5052814

Stramel, R D; Webber, S E ^[1]; Rodgers, M A.J. ^[2]

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1. Univ. of Texas, Austin (USA)
2. Bowling Green State Univ., OH (USA)

Poly(methacrylic acid) containing 0.5-1.0 mol % of the following anthracene derivatives has been prepared: 1, vinyldiphenylanthracene; 2, 2-(10-phenyl-9-anthryl)ethyl methacrylate; 3, 2-(10-ethyl-9-anthryl)ethyl methacrylate; 4, 2-(9-anthryl)ethyl methacrylate. The fluorescence quenching of these chromophores by methylviologen and propylviologensulfonate is highly pH dependent and occurs by a mixed static and dynamic mechanism. At high pH the viologens also form a charge transfer (CT) complex with the anthracenes. A simple equilibrium model provides a satisfactory fit to both static quenching (K{sub q}) and the CT complexation (K{sub CT}). Both equilibrium constants decrease with increased steric hindrance of the anthryl derivatives, and K{sub q} is always larger than K{sub CT}. This latter observation is interpreted as evidence for the role of weakly contacting pairs in static quenching. At low pH all systems exhibited radical pair formation with a quantum yield ({phi}{sub ce}) in the range 0.3-0.45. No systematic variation of {phi}{sub ce} with anthryl structure is found. The general role of polyelectrolyte-bound chromophores is discussed.

• DOE Contract Number: FG05-86ER13629
• OSTI ID: 5052814
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:5; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ANTHRACENE
AROMATICS
AZINES
BIPYRIDINES
CARBOXYLIC ACIDS
CONDENSED AROMATICS
DE-EXCITATION
ELECTRON TRANSFER
ENERGY TRANSFER
ENERGY-LEVEL TRANSITIONS
FLUORESCENCE
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
ION PAIRS
LUMINESCENCE
MATHEMATICAL MODELS
METHACRYLIC ACID
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PH VALUE
PYRIDINES
RADIATIONLESS DECAY
RADICALS