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Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890

February 2013 issue

Highlighted illustration

Cover illustration: 1,2-Diamines tend to adopt a conformation in which the arrangement of electron pairs is antiperiplanar. This behaviour is known as the `rabbit-ears effect', however it can be avoided by restriction of the 1,2-diamine in cyclic molecules. The crystal studied, C21H24F2N2O2, was a meso compound obtained by the reaction of the aminal (2S,7R,11S,16R)-1,8,10,17-tetraazapentacyclo[8.8.1.18,17.02,7.011,16]cosane with 4-fluorophenol. The imidazolidine ring has a twisted conformation with the lone pairs of the N atoms disposed in a syn isomerism, making this compound an exception to the typical `rabbit-ears effect' in 1,2-diamines. See: Rivera, Quiroga, Ríos-Motta, Kučeraková & Dušek [Acta Cryst. (2013). E69, o217].

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Research communications

Research communications are designed to help authors bring out the science behind their structure determinations. Authors are encouraged to report more than one structure in the same communication and also to include the results of investigations with other techniques. The Research communications format makes Acta E the natural home for structure determinations with interesting science to report.

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Acta E is included in the Emerging Sources Citation Index.

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