In situ visible spectroscopy of a gadolinium bisphthalocyanine LB film exposed to chlorine gas |
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| Institution: | Department of Physics and Centre for Molecular Materials, University of Sheffield, Hounsfield Road, Sheffield S3 7RH, UK;Department of Physics, Faculty of Physics Engineering, University of Hacettepe, Beytepe, Ankara, Turkey 06532;Department of Chemistry, Shandong University, Jinan 250100, Peoples Republic of China;State Key Laboratory of Rare Earth Material Chemistry and Applications, Peking University, Beijing 100871, Peoples Republic of China |
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| Abstract: | We report the preparation of Langmuir-Blodgett (LB) films of a gadolinium phthalocyanine, doubledecker, molecular sandwich-type complex Gd(Pc)2] and its ultraviolet-visible spectroscopic characterisation. We have studied the changes in the optical absorbance spectra that occur upon exposure to very low concentrations (~10 ppm) of chlorine gas. The main absorption band in the visible region occurs at ~690 nm. Upon exposure to chlorine gas, the intensity of this band decreases with the simultaneous introduction of a new peak at ~734 nm, an isosbestic point occurring at 721 nm. These spectral changes are indicative of oxidation of the complex by chlorine to form the Gd(Pc)2]+ species. The kinetics of this response suggest that the adsorption of chlorine by the LB film is a complex process, possibly involving up to three independent mechanisms. The LB film recovers almost fully (> 95%) upon switching off the chlorine supply. |
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