Abstract
Fluorescence decay measurements on 9-methylanthracene both covalently bound to the chain end and also solubihzed within unneutralized poly(methacrylic acid) in aqueous solution show that 9-methylanthracene can exist within large dusters of the chain that exist in the “native” structure of the chain and also within small structures that arise in response to the presence of the hydrocarbon. The hypercoiled form of PMA only consists of a tight random coil if its molecular weight is of the order of 10000, for greater molecular weights the chain contains more than one closely packed cluster joined flexibly to each other. The fluorescence lifetime of the 9-MeA within a large cluster is in the range 13–15 ns, approaching its radiative lifetimes.
Published Version
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