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A New Linear Dichroism Approach for Determining Solute Orientations within Anionic Micelles
The building units of lyotropic nematic liquid crystals are weakly anisometric micelles.Their macroscopic orientation may be achieved by magnetic fields.The very sensitive liquid crystal linear dichroism (LCLD) technique may therefore be applied to study local preferred orientations and also solubilization sites of aromatic guest molecules within these nonspherical host micelles.The orientational information thus obtained may be directly transferred and utilized in chemically corresponding classical micellar solutions.This new approach to the study of micellar systems and their catalytic processes cannot be followed within classical spherical micelles because of the isotropy of their solutions.A model of solubilization is presented which allows orientational order parameters to be interpreted on a stereochemical basis.All the aromatic hydrocarbons reported in this paper tended to be preferentially oriented by “radical intercalation” modes within the host micelle.Heterocyclic nitrogens in the guest molecular frameworks drastically affected the preferred orientations.All these nitrogen-induced effects may be ascribed to strong specific grasping of the guest heterocyclic nitrogens at the polar micelle surface.
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Reference£º
Phthalazine – Wikipedia,
Phthalazine | C8H6N385 – PubChem