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- W1972376475 abstract "Rotation spectra of isotopic forms of isoxazole (ONCHCHCH) have been studied in their natural abundance by double resonance modulated microwave spectroscopy. Earlier data have been refined and extended to include the three deuterium forms, also in natural abundance. From the eight isotopic species the complete structure of isoxazole has been determined. Bond distances (in Å) are O(1) –N(2) =1.399±0.001, N(2) –C(3) =1.309±0.002, C(3) –C(4) =1.425±0.002, C(4) –C(5) =1.356±0.001, C(5) –O(1) =1.344±0.001, C(3) –H(3) =1.077±0.001, C(4) –H(4) =1.074±0.001, and C(5) –H(5) =1.075±0.002. The ring angles, beginning at the oxgyen atom, are (uncertainties <0.2°) 108.8°, 105.3°, 112.3°, 103.0°, and 110.6°; the angles between the CH- and adjacent ring bonds are C(4)C(3)H(3) =129.1±0.3°, C(3)C(4)H(4) =128.5±0.4° and C(4)C(5)H(5) =133.4±0.5°. During the course of the structure study, satellite spectra due to each of the eleven bending vibrations of isoxazole were assigned and correlated with ir work through relative intensity measurements. The reassignment of the lowest in-plane bending mode as ν13=844 cm−1 is suggested. On the basis of the results on isoxazole and other molecules the likely impact of the DRM technique on structure determinations by microwave spectroscopy is considered." @default.
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- W1972376475 date "1975-09-15" @default.
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- W1972376475 title "The complete structure of isoxazole from naturally occurring isotopic forms by double resonance modulated microwave spectroscopy" @default.
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- W1972376475 doi "https://doi.org/10.1063/1.431647" @default.
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