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Rhythmic crystallization behavior of methyl mesitylcarbamate from chloroform solutions under appropriate conditions was found. Effects of temperature, evaporation rate of solvent, and sample weight per area on this behavior are studied in detail, and the qualitative explanation based on the autocatalytic branching process is proposed.

The S-N bonding character of N-arylsulfilimine was investigated by X-ray structure determination and X-ray photoelectron spectroscopy (XPS). The crystals of sulfilimine I are monoclinic, space group A2/o, in a unit cell of dimension o = 16.726 Á, b = 25.877 A, c = 5.676 Á, y = 118.29°. The positions of hydrogen atoms were also determined. The data of structure determinations and XPS suggest that the dir-px-interaction between the sulfur and the nitrogen is not important, but the N-arylsulfilimines are stabilized by other factors with the resonance interaction of the p-nitrophenyl moiety, i.e., the strong interaction through the bond between the sulfur and the nitrogen and the hyperconjugative effect. The multipeak structure due to shake up transition was observed in N Is peaks of the nitro group of N-arylsulfilimines and it was found that there is a correlation between the energy separation of doublets and the resonance interaction of the aryl ring.

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