The double salt materials platinum(II)tetrakis-R-β- methylphenethylisocyanide tetracyanoplatinate(II) (R-1) and platinum(II) tetrakis-S-β-methylphenethylisocyanide tetracyanoplatinate(II) (S-1) have been synthesized with highly enantiomerically pure isocyanide ligands. The vapochromic behavior of R-1 and S-1 has been studied in the presence of a chiral probe vapor to determine if enantiomerically selective sensing is possible with these materials. The wavelength of maximum emission values (λ max) for solid-state vapoluminescence spectra of R-1 and S-1 in the presence of enriched R- and S-2-butanol vapor differ by approximately 10 nm while the λmax values for R-1 and S-1 under nitrogen are nearly identical. Principal component analysis has been performed on datasets that consist of a series of vapoluminescence spectra of R-1 and S-1 as a function of the R/S-2-butanol ratio. Plots of principal component one versus R/S-2-butanol ratio show mirror image trends for R-1 relative to S-1. While care must be taken to control water vapor and monitor R-1 and S-1 for possible decomposition, the reported results nevertheless show that R-1 and S-1 are capable of enantiomerically selective vapochromic sensing.
Bibliographical noteFunding Information:
We are thankful for the support of the NSF RSEC grant administered by the University of Minnesota. In addition S.M.D. would like to recognize the Donors of the American Chemical Society Petroleum Research Fund for support of this research in addition to the support of Carleton College's Howard Hughes Medical Institute grant. Work in the laboratory of K.R.M. was supported by the Center for Process Analytical Chemistry and the Initiative for Renewable Energy and the Environment.
- Gas sensor
- Platinum double salt materials