title: UV/Vis Spectroscopic Evaluation of 4-Nitropyridine N-Oxide as a Solvatochromic Indicator for the Hydrogen-Bond Donor Ability of Solvents.
abstract: The potential of 4-nitropyridine N-oxide to act as a solvatochromic indicator of the hydrogen-bond donor ability of solvents has been evaluated. A linear free-energy relationship has been established that is predominantly dependent on the Kamlet-Taft alpha parameter of the solvent. In comparison to the previously reported results obtained for pyridine N-oxide, 4-nitropyridine N-oxide possesses a solvatochromic effect that is located in the long wavelength ultraviolet region (lambda = 330-355 nm) of the spectrum, making it a viable probe for hydrogen-bond donation assessment.
authors.affiliation: National Institute of Standards and Technology, Chemical Sciences and Technology Laboratory, Physical and Chemical Properties Division, 325 Broadway, Boulder, Colorado 80303.
authors.forename: Anthony F.
authors.initials: AF
authors.lastname: Lagalante
authors.forename: Ryan J.
authors.initials: RJ
authors.lastname: Jacobson
authors.forename: Thomas J.
authors.initials: TJ
authors.lastname: Bruno