ESR linewidths in solution. VIII. Two‐component diamagnetic solvents

摘要: The ESR spectra of dilute vanadyl acetylacetonate were studied in several two‐component solvents as a function component concentration. A modified Debye equation gives reasonable results for the rotational correlation time τϑ number solvent systems; this has form τϑ= (4π/3) r⊥3ηκ⊥/kT, where k is Boltzmann constant, r⊥3 volume which constant all systems, η viscosity, and κ⊥ dimensionless coupling parameter. κ⊥=κ⊥(A)xA +κ⊥(B)xB κ⊥(A) κ⊥(B) are parameters xA xB mole fractions components B, respectively. In ’’ideal’’ cases, these two equations hold quite well. independent temperature, pressure, viscosity (η), excess (η−η(A)xA−η(B) xB) small. η(A) η(B) viscosities pure For butanol systems at temperatures decreasing towards room temperature nonideal above not...