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The title compound C18H16N4O3 (Mr = 336.35) has been synthesized and characte- rized by elemental analysis and single-crystal X-ray diffraction. The Schiff base compound is a deri- vative of 4-aminoantipyrine. As expected, the molecular structure adopts a trans configuration about the central C=N double bond. It crystallizes in orthorhombic, space group P21/c with a = 7.632(1), b = 7.816(1), c = 28.082(5) , β = 96.18(1)o, V = 1665.48(51) ?3, Z = 4, Dc = 1.341 g/cm3, F(000) = 704, μ = 0.094 mm–1, the final R = 0.0448 and wR = 0.1058. Of the total 3748 collections, 3105 were unique. In the molecule there exist two different planes of pyrazoline and C(11)~C(16) phenyl ring, which are approximately coplanar (r.m.s. de deviation from the combined mean plane is 0.03 ) with the dihedral angle between them of 9.8°.
The expected compound C18H16N4O3 (Mr = 336.35) has been synthesized and characte-rized by elemental analysis and single-crystal X-ray diffraction. The expected compound of a 4- trans configuration about the central C = N double bond. It crystallizes in orthorhombic space group P21 / c with a = 7.632 (1), b = 7.816 (1), c = 28.082 , V = 1665.48 (51)? 3, Z = 4, Dc = 1.341 g / cm3, F (000) = 704, μ = 0.094 mm-1, the final R = 0.0448 and wR = 0.1058. , 3105 were unique. In the molecule there exist two different planes of pyrazoline and C (11) ~ C (16) phenyl ring, which are approximately coplanar (rms de deviation from the combined mean plane is 0.03) with the dihedral angle between them of 9.8 °.