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Two-photon Voltmeter for Measuring a Molecular Electric Field

Two-photon Voltmeter for Measuring a Molecular Electric Field

Aleksander Rebane, Geoffrey Wicks, Mikhail Drobizhev, Thomas Cooper, Aleksander Trummal, Merle Uudsemaa

Angew Chem Int Ed Engl. 2015 Jun 22;54(26):7582-6.

PMID: 25958849

Abstract:

We present a new approach for determining the strength of the dipolar solute-induced reaction field, along with the ground- and excited-state electrostatic dipole moments and polarizability of a solvated chromophore, using exclusively one-photon and two-photon absorption measurements. We verify the approach on two benchmark chromophores N,N-dimethyl-6-propionyl-2-naphthylamine (prodan) and coumarin 153 (C153) in a series of toluene/dimethyl sulfoxide (DMSO) mixtures and find that the experimental values show good quantitative agreement with literature and our quantum-chemical calculations. Our results indicate that the reaction field varies in a surprisingly broad range, 0-10(7) V cm(-1) , and that at close proximity, on the order of the chromophore radius, the effective dielectric constant of the solute-solvent system displays a unique functional dependence on the bulk dielectric constant, offering new insight into the close-range molecular interaction.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP70504017	N,N-Dimethyl-6-propionyl-2-naphthylamine		70504-01-7	Price

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