Thin films of fluorinated 3d-metal phthalocyanines as chemical sensors of ammonia: An optical spectroscopy study

•The sensor response of fluorinated phthalocyanines of 3d-metals (Cu(II), Co(II), Ni(II), Zn(II)) toward NH3 was studied using surface plasmon resonance technique.•The effect of central metal in MPcF16 molecule on the sensor response was revealed.•The structure of analyte/phthalocyanine complex was...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2016-05, Vol.227, p.634-642
Main Authors: Basova, Tamara V., Mikhaleva, Natalia S., Hassan, Aseel K., Kiselev, Vitaly G.
Format: Article
Language:English
Subjects:
Ammonia
Ammonia detection
Bands
DFT
Fluorination
Hexadecafluorinated phthalocyanines
Infrared radiation
Mathematical analysis
Optical sensors
Sensors
SPR
Surface chemistry
Thin films
Vibrational Spectra
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Summary:•The sensor response of fluorinated phthalocyanines of 3d-metals (Cu(II), Co(II), Ni(II), Zn(II)) toward NH3 was studied using surface plasmon resonance technique.•The effect of central metal in MPcF16 molecule on the sensor response was revealed.•The structure of analyte/phthalocyanine complex was analyzed using DFT calculations.•A detailed assignment of all intense bands in the vibrational spectra (IR and Raman) of fluorinated phthalocyanines of 3d-metals (Cu(II), Co(II), Ni(II), Zn(II)) was performed. A comparative study of the sensor response toward gaseous ammonia of hexadecafluorinated 3d-metal phthalocyanine (MPcF16, MCu(II), Co(II), Zn(II), Ni(II)) thin films was performed using complementary experimental (viz., surface plasmon resonance, SPR, and IR absorption spectroscopy) along with theoretical (density functional theory calculations, DFT) techniques. SPR measurements revealed changes of both thickness and optical parameters (refraction indices and extinction coefficients) of the MPcF16 films caused by adsorption of NH3. The MPcF16 species studied exhibited the following order of sensor response: ZnPcF16>CoPcF16≥CuPcF16>NiPcF16. A good correlation was found between the DFT calculated (B3LYP/6-311++G(2df,p)) binding energies, experimentally measured shift of the selected IR bands, and the optical sensor response. Apart from this, we performed a detailed assignment of all intense bands in the vibrational spectra (IR and Raman) of fluorinated 3d-metal phthalocyanines studied.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2015.12.079