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ARS Home » Plains Area » Manhattan, Kansas » Center for Grain and Animal Health Research » Grain Quality and Structure Research » Research » Publications at this Location » Publication #376981

Research Project: Measurement and Improvement of Hard Winter Wheat End-Use Quality Traits

Location: Grain Quality and Structure Research

Title: pH Mediated Colorimetric and Luminescent Sensing of Aqueous Nitrate Anions by a Platinum(II)@Mesoporous Silica Composite

item Norton, Amie
item ABDOLMALEKI, MAHMOOD, - University Of Texas Rio Grande Valley
item RINGO, JESSICA - University Of Cincinnati
item CASHEN, CHRISTINA - University Of Cincinnati
item SHARMA, MALVIKA - University Of Cincinnati
item CONNICK, WILLIAM - University Of Cincinnati
item CHATTERJEE, SAYANDEV - Essence Diagnostics Llc

Submitted to: ACS Applied Materials and Interfaces
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/9/2020
Publication Date: 3/31/2021
Citation: Norton, A.E., Abdolmaleki, M.K., Ringo, J., Cashen, C., Sharma, M., Connick, W., Chatterjee, S. 2021. A colorimetric/luminescence sensor for detecting MeCN in water: towards direct detection of dissolved organic contaminants. ACS Applied Materials and Interfaces.

Interpretive Summary: Organic compounds (such as benzene, trichloroethylene, dichloromethane, and acetonitrile) can lead to contamination in our drinking water. Right now screening techniques for these compounds involves expensive and cumbersome instrumentation such as mass spectroscopy. There is a desire to deploy in the field methods for the detection of the compounds. A method that could fill this gap is chemical sensors. In this paper we discus the first vapochromic sensor [Pt(tpy)Cl](PF6) (1.PF6) as a sensor for organic compounds in ground water. We use 1.PF6 for the selective detection of acetonitrile in water. The mechanism of the response is characterize by SEM (Scanning Electron Microscopy), emission and XRPD (X-ray powder Diffraction).

Technical Abstract: 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 re-versible 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 quantita-tive 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.