A digital imaging method for evaluating the kinetics of vapochromic response

Mahmood Karimi Abdolmaleki; M Sadegh Riasi; Mojtaba Enayati; Amie E Norton; Sayandev Chatterjee; Lilit Yeghiazarian; William B Connick; Alireza Abbaspourrad

doi:10.1016/j.talanta.2019.120520

A digital imaging method for evaluating the kinetics of vapochromic response

Talanta. 2020 Mar 1:209:120520. doi: 10.1016/j.talanta.2019.120520. Epub 2019 Nov 9.

Authors

Mahmood Karimi Abdolmaleki¹, M Sadegh Riasi², Mojtaba Enayati³, Amie E Norton⁴, Sayandev Chatterjee⁵, Lilit Yeghiazarian², William B Connick⁴, Alireza Abbaspourrad⁶

Affiliations

¹ Department of Food Science, Cornell University, 243 Stocking Hall, Ithaca, NY, 14853, USA; Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA.
² Department of Chemical and Environmental Engineering, University of Cincinnati, Cincinnati, OH, 45221, USA.
³ Department of Food Science, Cornell University, 243 Stocking Hall, Ithaca, NY, 14853, USA.
⁴ Department of Chemistry, University of Cincinnati, Cincinnati, OH, 45221, USA.
⁵ Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.
⁶ Department of Food Science, Cornell University, 243 Stocking Hall, Ithaca, NY, 14853, USA. Electronic address: Alireza@cornell.edu.

PMID: 31892005
DOI: 10.1016/j.talanta.2019.120520

Abstract

This work describes the novel use of a cell phone camera and the L*a*b method (color space defined by the International Commission on Illumination) to characterize the color change in different vapochromic platinum(II) complexes in order to get quantitative and more reliable data. In this study, we have developed a semi-automatic CCA software that digitally analyzes images (e.g., video frames) collected while a vapochromic material is absorbing vapor and changing its color. The advantages of using this method, compared to reflectance or transmission spectroscopy through a thin film, include its low cost, convenience, portability, ease of sample preparation, the lack of need for specialized equipment, and the possibility of simultaneously collecting data on different samples under identical conditions. The results show that this strategy is effective in producing quantitative information about the kinetics of processes.

Keywords: CIELAB color space; Color change; Platinum(II) complexes; Vapochromic materials.