A colorimetric/luminescence sensor for detecting MeCN in water: Towards direct detection of dissolved organic contaminants

Highlights •Molecular recognition of organic contaminants in water by a linear Pt(II) complex.•Highly targeted luminescence and colorimetric response of the complex to acetonitrile in water.•The proportional increase of luminescence intensity of an MMLCT band with MeCN concentration allows for quant...

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Published in:Sensors and actuators. B, Chemical Vol. 329; p. 129207
Main Authors: Norton, Amie E., Abdolmaleki, Mahmood Karimi, Ringo, Jessica M., Shingade, Vikas M., Cashen, Christina, Sharma, Malvika, Connick, William B., Chatterjee, Sayandev
Format: Journal Article
Language:English
Published: Lausanne Elsevier B.V 15.02.2021
Elsevier Science Ltd
Subjects:
Colorimetry
Contaminants
Coordination compounds
Crystal lattices
Doppler effect
Electronic structure
Environmental contaminants
Organic contaminants
Platinum
Platinum complexes
Red shift
Sensitivity
SENSOR selectivity
Spectroscopy
Transition metal compounds
Water security
SENSOR selectivity
Sensitivity
Water security
Environmental contaminants
Platinum complexes
ISSN:0925-4005, 1873-3077
Online Access:Get full text
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Summary:Highlights •Molecular recognition of organic contaminants in water by a linear Pt(II) complex.•Highly targeted luminescence and colorimetric response of the complex to acetonitrile in water.•The proportional increase of luminescence intensity of an MMLCT band with MeCN concentration allows for quantification as well. [Display omitted] To address the need for a field-deployable in-situ technique for the accurate and reliable detection of organic contaminants in water, this work reports a new chemical sensing approach for the detection of aqueous MeCN. The approach relies on the reversible colorimetric/luminescent change in a transition metal complex. In this approach, a square planar platinum salt [Pt(tpy)Cl](PF6) (tpy = 2,2′:6′,2″-terpyridine) demonstrated a reversible color change from yellow to red as well as a red shift in emission intensity upon exposure to aqueous MeCN. This observed spectroscopic change was induced by the incorporation of MeCN molecules withing the crystal lattice of the platinum salt, that resulted in an enhancement in the intermolecular Pt•••Pt interactions, which correlatively altered the electronic structure. The spectroscopic response was highly selective and quantitative for aqueous MeCN. This work illustrates a new technique for the rapid, selective, sensitive detection of aqueous MeCN, while also providing a general strategy for the detection of other small molecule contaminants.
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ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2020.129207