Temperature influence on 4-aminophthalimide emission in 1-chloroalkanes plus water mixtures.
Thermochromic emission shifts of 4-aminophthalimide (4-AP) dissolved in three 1-chloroalkanes, namely, 1-chloropropane, 1-chlorobutane, and 1-chlorohexane, together with fluorescence decays measured at different wavelengths, all solvents containing different small amounts of water (10(-4)-10(-2) M), are reported in a broad temperature range covering the bulk water melting point. Our studies have shown that 4-AP is an effective indicator of water presence even at concentrations given by solvent suppliers for so-called "dry" solvents. Additionally, indications of water ice-clusters formation in 1-chloroalkanes, starting at different temperatures depending on water concentration, have been found. Finally, 4-AP in 1-chloroalkane + water mixture is shown to present at different temperatures three basic types of sources of time-resolved emission spectra (TRES) time/spectral evolution: emission of two kinetically coupled species, solvent relaxation, and simultaneous emission of two independent species.
Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614 Poznań, Poland.
Krzysztof
K
Dobek
Jerzy
J
Karolczak
Dariusz
D
Komar
D002073:Butanes / Q000737:chemistry*; D006586:Hexanes / Q000737:chemistry*; D006843:Hydrocarbons, Chlorinated / Q000737:chemistry*; D015394:Molecular Structure; D010797:Phthalimides / Q000737:chemistry*; D013696:Temperature; D014867:Water / Q000737:chemistry*
C529630:4-aminophthalimide; D002073:Butanes; D006586:Hexanes; D006843:Hydrocarbons, Chlorinated; D010797:Phthalimides; D014867:Water; C053283:1-chlorohexane; C542783:1-chloropropane; C006854:butyl chloride