Abstract
Measurements of the thermodynamic parameters of the free radical-dimer equilibrium in benzene for 2,2′-bis[R-2-(p-dimethylaminophenyl)indan-1,3-diones] with different substituants R on the phthaloyl ring have been carried out. The equilibrium constants satisfy the Hammett equation (p=0.87, benzene, 20‡C). The bond breaking energy of the central C2−C2' bond in the dimers amounts to ∼18–20 kcal/mole The extinction coefficients of the 2-aryl-indan-1,3-dione-2-yl radicals in benzene have been determined. The long-wave band of the radicals displays thermo- and solvatochromism.
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Schedule a callMore From: Bulletin of the Academy of Sciences of the USSR Division of Chemical Science
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