The mol-ecule of the title compound, C(5)H(9)NO(3), is essentially planar [the maximum deviation for a non-H atom from the mean plane is 0.021 (3) Å] due to the π-conjugation of the hydroxy-imino and carbonyl groups, which are trans to each other; ab initio calculations in vacuo at the DFT (B3LYP/6-311G**++) level of theory confirmed that E conformer is indeed the lowest in energy. The packing in crystal structure is influenced by strong inter-molecular O-H⋯N hydrogen-bonding inter-actions between oxime groups and also by π-stacking of the mol-ecules due to the carbonyl and oxime group orbital overlap [inter-planar distance between adjacent mol-ecules = 3.143 (4) Å]. Jointly, these factors afford infinite 6.32 Å thick mol-ecular sheets, where the plane of each mol-ecule is perpendicular to the plane of the sheet. Seen from above, the mol-ecules within the sheet are arranged in a herringbone pattern. Such sheets form a stack due to weak van der Waals inter-actions; the gap between adjacent sheets is 2.07 Å.
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| http://dx.doi.org/10.1107/S1600536810009438 | DOI Listing |
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