J. F. Chiang, John Song
1983
Citations
1
Influential Citations
24
Citations
Journal
Journal of Molecular Structure
Abstract
Abstract The molecular structures of 4-nitro-, 4-methyl- and 4-chloro-pyridine- N -oxides have been determined by gas-phase electron diffraction. The structural parameters are obtained by least-squares fitting of the calculated molecular intensity functions to the observed intensities. A C 2v symmetry was assumed for 4-nitro- and 4-chloro-pyridine- N -oxides and C s for 4-methylpyridine- N -oxide. The deduced structural parameters are as follows: 4-nitropyridine- N -oxide; N 1 O 8 = 1.281 ± 0.022, N 7 O 13 = 1.262 (assumed), N 1 C 2 = 1.469 ± 0.066, C 2 C 3 = 1.386 ± 0.025, C 3 C 4 = 1.447 ± 0.019, C 4 N 7 = 1.628 ± 0.013, CH = 1.050 A (averaged); 4-methylpyridine- N -oxide; N 1 C 2 = 1.430 ± 0.034, C 2 C 3 = 1.354 ± 0.048, C 3 C 4 = 1.321 ± 0.062, C 4 C 7 = 1.577 ± 0.027, N 1 O 8 = 1.405, C 2 H 9 = 1.040, C 7 H 13 = 1.095 A; 4-chloropyridine- N -oxide; N 1 C 2 = 1.438 ± 0.017, C 2 C 3 = 1.363 ± 0.024, C 3 C 4 = 1.448 ± 0.027, N 1 O 8 = 1.262 ± 0.028, C 4 Cl 7 = 1.714 ± 0.025, CH = 1.10 A (averaged).