title: Short- and long-range spectral perturbants: dependence on solvent concentration and chromophore structure.
abstract: Some perturbing solvents appear to be short-range perturbants at 20% concentration, but long-range at 40%, based on delta epsilon/epsilon for phenols and their ethers. The apparent long- or short-range character of a solvent also depends on the chromophore. It is possible that perturbants, which are apparently of long-range character at 20% concentration, are really of short-range character because they interact rather similarly with phenols and their ethers. For ethers delta epsilon/epsilon increases faster than for phenols with increasing concentrations of some perturbants.
mesh_terms: D000596:Amino Acids; D005026:Ethylene Glycols; D000432:Methanol; D012997:Solvents; D013057:Spectrum Analysis; D013454:Sulfoxides
chemical_list: D000596:Amino Acids; D005026:Ethylene Glycols; D012997:Solvents; D013454:Sulfoxides; D000432:Methanol