Crystal engineering: supramolecular structures by cocrystallization of meso-1,2-diphenyl-1,2-ethanediol and bisimines, simple cases of molecular recognition.
The crystal structures of mol. complexes between meso-1,2-diphenyl-1,2-ethanediol and two bisimines [N,N'-(dibenzylidene)-ethylenediamine and glyoxylidene-bis(2,4-dimethyl-3-pentylamine)] are reported at different temps. The structure-detg. motif of the cocryst. arrangement is one single O-H ... N hydrogen bond resulting in infinite ladder-like polymers. The supramol. structure is formed by recognition of fitting species: The D- or L-isomers do not arrange in such structures. 1H NMR expts. show that no prearrangements take place by forming complexes in soln.
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