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Threshold concentration in nonlinear absorbance law


A new nonlinear relationship of the absorption coefficient with the concentration was proposed, allowing calculating the threshold concentration, after which there is a deviation from the Beer-Lambert law. The nonlinear model was successfully tested on a stable dimeric phthalocyanine ligand of J-type in solvents with different polarity. It was shown that deviation from the linearity is associated with a specific association of the macrocyclic molecules, which, in the case of non-polar solvents, leads to the formation of H-aggregates from J-type dimeric molecules. The aggregation number was estimated to be less than 1.5 that has allowed us conducting a series of analytic experiments in a wide range of concentrations (1×10-6 – 5×10-4 mol L-1).

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Publication details

The article was received on 09 Mar 2017, accepted on 10 Apr 2017 and first published on 12 Apr 2017

Article type: Paper
DOI: 10.1039/C7CP01514C
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Threshold concentration in nonlinear absorbance law

    A. Tolbin, V. Pushkarev, L. G. Tomilova and N. S. Zefirov, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP01514C

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