Determination of interfacial dielectric constant of AOT-based reverse micelle by probing magnetic field effect on pyrene–DMA exciplex luminescence

The effect of magnetic field on the luminescence of pyrene–DMA exciplex confined within the reverse micellar (RM) environment of various cavity sizes is reported. The field-modulated change in luminescence Δϕ/ϕ) at various w values is strikingly similar to the Δϕ/ϕ vs dielectric constant (ε) variation of solvent mixtures which suggests that ε of the RM interface is primarily responsible for the variation of magnetic field effect (MFE). The interfacial dielectric constant at different w values may be evaluated on the basis of the above similarity.