The monoclinic phase of TCNE (C6N4) was submitted to a new X-ray and neutron diffraction analysis. Contrary to the results reported by Bekoe and Trueblood (1960) we found a slight disorder, such that 3.8 -5 % of the molecules are rotated about 90 degrees in the molecular plane around their center of gravity. The final i?-values are 0.035 for the X-rayand 0.033 for the neutron-data. The resulting X -N-map showed clearly resolved peaks, whose hights correspond well with theoretical calculations.
Rubazoic acid derivatives form a strong chelated hydrogen bond in an eight-membered ring. The structures of 4-(5-hydroxy-1,3-dimethyl-4-pyrazolylmethylene)-1,3-dimethyl-2-pyrazolin-5-one, C 11H 14-
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