Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 15, Pages 7647-7653Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am401961s
Keywords
10-methylphenothiazine; 1,3-dinitrobenzene; cocrystals; crystal structure; charge transfer complex; explosives detection
Funding
- Center for Materials for Information Technology at the University of Alabama
- Emerging Scholars Program at the University of Alabama
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The evaporation of an ethanol solution containing an equimolar mixture of 10-methylphenothiazine and 1,3-dinitrobenzene gave red-purple crystals. The diffuse reflection spectrum for the cocrystals showed a low reflectance from the UV through the visible spectrum until the reflectance increased at the red end of the visible spectrum. The crystal structure showed alternating pi stacking of the electron-rich 10-methylphenothiazine and the electron-poor 1,3-dinitrobenzene. There were also hydrogen bonding interactions between the nitro groups from 1,3-dinitrobenzene and the aromatic hydrogen atoms from 10-methylphenothiazine. The infrared spectrum showed a shift to lower wavenumbers for the symmetric and antisymmetric stretching modes for the nitro groups. Thin films containing 10-methylphenothiazine in polystyrene were exposed to 1,3-dintrobenzene vapor, and spectroscopic ellipsometry showed an average increase in the refractive index of 0.006 through the entire range of wavelengths from 1000 to 300 nm.
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