| Abstract: | The Schiff base pyridine-2-carboxaldehyde-4-aminoantipyrine (C17H16N4O 1) and its perchlorate (C17H17N4O·ClO4 2) have been prepared and characterized by elemental analysis, IR spectra and single-crystal X-ray crystallography analysis. Both 1 and 2 crystallize in the monoclinic system, space group P21/c. For 1, a = 8.6820(12), b = 24.934(3), c = 7.0064(10)(A), β = 97.942(3)°, V = 1502.2(4)(A)3, Z = 4, Dc = 1.293 g/cm3, F(000) = 616,μ = 0.084 mm-1, the final R = 0.0592 and wR = 0.1244. For 2, a = 5.9302(2), b = 20.347(7), c = 14.663(6)(A),β = 90.200(9)°, V = 1769.2(11)(A)3, Z = 4, Dc = 1.475 g/cm3, F(000) = 816, μ= 0.254 mm-1, the final R = 0.0533 and wR = 0.0819. As expected, both molecular structures of 1 and 2 adopt a trans configuration about the central C=N double bond. 2 is an ionic compound with the protonation at N(1) of pyridine-2-carboxaldehyde-4- aminoantipyrine. |
