L. Sapienza
1993
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Journal
Chinese Journal of Structural Chemistry
Abstract
The crystal and molecular structures of 4-methyl-cyclohexanone semicarbazone (MCSC) and 4-cyclohexyl-cyclohexanone semicarbazone (CHCSC) have been determined by X-ray diffraction methods. MCSC, monoclinic, space group C2/c with a=19. 788(5), b=8.328(2), c=14. 372(4) A , β=127. 44(1)°, final R = 0. 051, Rw = 0. 057 for 801 unique reflections. CHCSC, triclinic, space group P1 with a = 5. 874(5), b = 7. 026(3), c=17. 93(1)A, α=88. 57(4)°,β = 83.08(5)°,γ=111. 66(5)°, final R = 0. 063, Rw = 0. 057 for 2144 unique reflections. The cyclohexane ring of both compounds has a slightly distorted chair conformation. The NH CONH group in both molecules shows a configuration with the C = O bonds trans to the N-NH bond with respect to the C-NH bond. The molecules in the crystals interacted with each other forming infinite ribbons through the O....H -N hydrogen bonds.