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Simultaneous Occurrence of Vapochromism and Vapoluminescence in Formaldehyde-Responsive Amino-Functionalized
Sujitra Tunsrichon1, Kittipong Chainok2, Vinich Promarak3
1Materials Chemistry Research Center, Department of Chemistry, Faculty of Science, Khon Kaen University, Muang, Khon Kaen 40002, Thailand.
Inorganic Chemistry
|July 21, 2022
Summary
New copper coordination polymers exhibit dual-mode vapochromism and vapoluminescence, changing color and luminescence in response to formaldehyde vapor. This discovery offers a highly selective method for detecting harmful volatile organic chemicals.
Area of Science:
- Materials Science
- Coordination Chemistry
- Chemical Sensing
Background:
- Vapor-responsive chromic materials are crucial for detecting volatile organic chemicals (VOCs).
- Amino-functionalized copper(I) coordination polymers offer potential for novel sensing applications.
Purpose of the Study:
- Synthesize and characterize new amino-functionalized Cu(I) coordination polymers.
- Investigate their vapor-responsive chromic and luminescent properties.
- Elucidate the mechanism of formaldehyde detection.
Main Methods:
- Single-crystal X-ray diffraction for structural analysis.
- Synthesis of four new Cu(I) coordination polymers: [CuI(pyt-NH2)] (1, 2) and [CuSCN(pyt-NH2)] (3, 4).
- Spectroscopic techniques (FT-IR, ESI-MS, 1H NMR, PXRD) and luminescence lifetime measurements.
Main Results:
- Polymorphic structures of iodo-based (1, 2) and thiocyanato-based (3, 4) coordination polymers were determined.
- Compounds 1 and 2 exhibited simultaneous vapochromism and vapoluminescence upon exposure to formaldehyde vapor.
- A highly selective dual-mode sensing response to formaldehyde was observed.
Conclusions:
- The synthesized Cu(I) coordination polymers demonstrate a novel dual-mode sensing mechanism for formaldehyde.
- Carbinolamine formation between formaldehyde and amino groups triggers structural changes, leading to observable color and luminescence shifts.
- These materials represent a significant advancement in selective volatile organic chemical detection.
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