Substituted α-Benzylphenethylamines**Product Development Laboratory of Parke, Davis &amp; Co., Detroit, Mich.

Edgerton, William H.; Hull, Robert Lee; Fisher, James R.

doi:10.1002/jps.3030480607

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Steric effects on excimer formation in 2‐amino‐1,3‐di(2‐naphtyl)propane luminiscent markers covalently bonded to poly [N‐(2‐hydroxypropyl)methacrylamide]

1987

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The fluorescence spectra of poly[N-(2-hydroxypropyl)methacrylamide] (poly[l-(Zhydroxy-propy1aminocarbonyl)-I-methylethylenel) with covalently bonded luminiscent markers (2amino-I ,3-di(2-naphthyl)propane (ADNP)) dissolved in methanol were measured over the temperature range 190-290 K. The effect of the spacer length on intramolecular excimer formation in ADNP was investigated. The ratio of the fluorescence intensities of the dimer ZD and the monomer ZM follows an Arrhenius temperature dependence in the temperature range 190 -250 K with an activation energy independent of the spacer length. The numerical value of ZD/ZM at constant temperature increases with increasing spacer length reaching quickly a limiting value. The effect is explained by increasing hindrance to intramolecular excimer formation which is dueparticularly for the shortest spacersto increased steric interactions of the marker with the polymer chain.

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