issue contents

February 2013 issue

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, C<sub>21</sub>H<sub>24</sub>F<sub>2</sub>N<sub>2</sub>O<sub>2</sub>, was a meso compound obtained by the reaction of the aminal (2S,7R,11S,16R)-1,8,10,17-tetraazapentacyclo[8.8.1.1<sup>8,17</sup>.0<sup>2,7</sup>.0<sup>11,16</sup>]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].

inorganic compounds

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metal-organic compounds

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organic compounds

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