Cavity-containing rhenium metallacycle treated evanescent wave infrared chemical sensors for the selective determination of odorous amines in the atmosphere

[Display omitted] •A highly stable Re metallacycles was successfully synthesized.•Owing to the cavity property and functionality, the synthesized Re metallacycles was selective for amines with phenyl ring.•Significant improvement of IR sensor in detection of VOCs was successfully approached. An evan...

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Published in:Sensors and actuators. B, Chemical Chemical, 2018-01, Vol.254, p.424-430
Main Authors: Huang, Genin Gary, Lee, Chung-Jay, Yang, Jyisy, Lu, Zong-Zhan, Sathiyendiran, Malaichamy, Huang, Chia-Yuan, Kao, Ya-Chuan, Lee, Gene-Hsiang, Lu, Kuang-Lieh
Format: Article
Language:English
Subjects:
Aliphatic compounds
Amines
Amino acids
Chemical sensor
Chemical sensors
Evanescent wave
Evanescent waves
Fluorescence
Hydroxyl groups
Infrared
Infrared detectors
Metals
Molecular chains
Molecules
Organic chemistry
Organometallic compounds
Phase transitions
Rhenium
Supramolecule
VOCs
Volatile organic compounds
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Summary:[Display omitted] •A highly stable Re metallacycles was successfully synthesized.•Owing to the cavity property and functionality, the synthesized Re metallacycles was selective for amines with phenyl ring.•Significant improvement of IR sensor in detection of VOCs was successfully approached. An evanescent wave infrared chemical sensor was developed for the selective detection of odorous amino compounds in the atmosphere. To achieve this goal, cavity-containing rhenium metallacycles with multi-recognition sites were prepared and used as host molecules to modify the surface of an evanescent wave infrared (EWIR) sensing element. The unique cavity structure with hydrophobic properties of the Re metallacycle permits the selective trapping of suitably sized compounds with proper functionalities. To explore the scope of the process, two different Re metallacycles were synthesized and used to trap a series of volatile organic compounds (VOCs) with different functionalities. Based on the results, Re metallacycles are selective to detect amino compounds as evidenced by the peak shifts for CO absorption after the amino compounds had been adsorbed. The hydrophobic pocket and hydroxyl groups in the Re metallacycles were also verified to provide extra forces to stabilize the attraction of amino compounds. The efficiency of the Re metallacycles in detecting amino compounds follows the order of amine with phenyl ring > aliphatic primary amine∼cyclo-amine > aliphatic secondary amine > aliphatic tertiary amine. This sensor was applied to detect benzyl amine and a linear range up to 1mg/L could be obtained with a detection limit close to 4μg/L.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2017.07.121