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Issue 4, 2014
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The importance of charge-transfer interactions in determining chromophoric dissolved organic matter (CDOM) optical and photochemical properties

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Abstract

Absorption of sunlight by chromophoric dissolved natural organic matter (CDOM) is environmentally significant because it controls photic zone depth and causes photochemistry that affects elemental cycling and contaminant fate. Both the optics (absorbance and fluorescence) and photochemistry of CDOM display unusual properties that cannot easily be ascribed to a superposition of individual chromophores. These include (i) broad, unstructured absorbance that decreases monotonically well into the visible and near IR, (ii) fluorescence emission spectra that all fall into a single envelope regardless of the excitation wavelength, and (iii) photobleaching and photochemical quantum yields that decrease monotonically with increasing wavelength. In contrast to a simple superposition model, these phenomena and others can be reasonably well explained by a physical model in which charge-transfer interactions between electron donating and accepting chromophores within the CDOM control the optical and photophysical properties. This review summarizes current understanding of the processes underlying CDOM photophysics and photochemistry as well as their physical basis.

Graphical abstract: The importance of charge-transfer interactions in determining chromophoric dissolved organic matter (CDOM) optical and photochemical properties

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Publication details

The article was received on 31 Oct 2013, accepted on 30 Jan 2014 and first published on 07 Feb 2014


Article type: Critical Review
DOI: 10.1039/C3EM00573A
Author version available: Download Author version (PDF)
Citation: Environ. Sci.: Processes Impacts, 2014,16, 654-671
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    The importance of charge-transfer interactions in determining chromophoric dissolved organic matter (CDOM) optical and photochemical properties

    C. M. Sharpless and N. V. Blough, Environ. Sci.: Processes Impacts, 2014, 16, 654
    DOI: 10.1039/C3EM00573A

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