Universal Correlation Between Solvent Polarity, Fluorescence Lifetime and Macroscopic Viscosity of Alcohol Solutions

作者：Kumar Pradip; Bohidar H B^*

来源：Journal of Fluorescence, 2012, 22(3): 865-870.

DOI：10.1007/s10895-011-1023-z

• Solvent polarity
• Viscosity
• Carbon nanoparticles
• Fluorescence lifetime

In this report, we show interesting correlation between solvent polarity of alcohol solutions and fluorescence lifetime (tau(av)), estimated from time-resolved fluorescence spectroscopy (TRFS), and macroscopic viscosity (eta). Non-functionalized carbon nanoparticles (NCNP) were successfully used as flurophores in these measurements. The solvent polarity, described through polarizability () of dielectric continuum theory, could universally describe both tau(av)/tau(max) and eta/eta(max) through the relation, X(Delta f) = a(OH) + b(Delta f - Delta f(OH)) + c(Delta f - Delta f(OH))(2) with X = tau(av)/tau(max) or eta/eta(max), (subscript OH represents corresponding values for alcohols) for alcohol solutions of methanol, ethanol and 1-propanol at room temperature. We show that fluorescence lifetime and solvent viscosity are universal functions of solvent polarity for alcohol solutions.

• 出版日期2012-5