UV/Vis Spectroscopic Evaluation of 4-Nitropyridine N-Oxide as a Solvatochromic Indicator for the Hydrogen-Bond Donor Ability of Solvents |
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| Authors: | Lagalante Anthony F Jacobson Ryan J Bruno Thomas J |
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| Institution: | National Institute of Standards and Technology, Chemical Sciences and Technology Laboratory, Physical and Chemical Properties Division, 325 Broadway, Boulder, Colorado 80303. |
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| 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. |
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