1379600-80-2Relevant academic research and scientific papers
Novel capsular aggregates from flexible tripodal triureas with C s symmetry
Alajarin, Mateo,Orenes, Raul-Angel,Howard, Judith A. K.,Spencer, Elinor C.,Steed, Jonathan W.,Pastor, Aurelia
, p. 2389 - 2397 (2012)
Tris(2- and 3-ureidobenzyl)amines with Cs symmetry self-assemble in solution forming mixtures of regioisomeric capsular aggregates, one of which is chiral and the other centrosymmetric. Under certain conditions, a predominance of the centrosymmetric regioisomer is found before equilibrium, that is, a mixture close to the statistical ratio of the two species is reached. In the solid state, there is a preference for the centrosymmetric capsules. Molecular models of both regioisomeric aggregates have been built and analyzed for comparison. Guests inside capsules formed by self-assembly of desymmetrized tris(3-ureidobenzyl)amines feel different magnetic environments, depending on whether they are inside a chiral or an achiral regioisomeric container. Of special significance are the experiments with a more flexible triurea endowed with an ureidopropylic arm, which self-assembles with the same efficiency as the more rigid tris(ureidobenzyl)amines. Copyright
