{open_quotes}Vapochromic{close_quotes} compounds as environmental sensors. 2. Synthesis and near-infrared and infrared spectroscopy studies of [Pt(arylisocyanide){sub 4}][Pt(CN){sub 4}] upon exposure to volatile organic compound vapors
- Univ. of Minnesota, Minneapolis, MN (United States)
The synthesis, characterization, and vis-NIR-IR vapochromic/spectroscopic studies are reported for isocyanide compounds of the form [Pt(arylisocyanide){sub 4}][Pt(CN){sub 4}] (where arylisocyanide = p-CNC{sub 6}H{sub 4}C{sub n}H{sub 2n+1}; n = 1, 6, 10, 12, 14). The dark blue, solid materials change color in the NIR (near-infrared) spectral region upon exposure to the ambient room-temperature vapor pressure of volatile organic compounds (VOCs). All the spectroscopic data suggest that the VOC penetrates the solid and interacts with the linear chain chromophore to cause the spectral shifts in the vis-NIR-IR spectral regions. The vapochromic shifts are suggested to be due to diole-dipole and/or H-bonding interactions between the Pt(CN){sub 4}{sup 2-} anion and polar VOCs. For nonpolar VOCs, lypophilic interactions between the VOC and the isocyanide ligands that cause no change in the {nu}-(CN) stretching region must cause the NIR vapochromism observed. The absence of a vapochromic response for water vapor is suggested to arise from hydrophobic blocking of the water at the solid/gas interface. 21 refs., 4 figs., 3 tabs.
- DOE Contract Number:
- AC07-94ID13223
- OSTI ID:
- 526079
- Journal Information:
- Chemistry of Materials, Journal Name: Chemistry of Materials Journal Issue: 1 Vol. 9; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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