Chiral versus racemic building blocks in supramolecular chemistry: tartrate salts of organic diamines

Acta Crystallographica. Section B, Structural Science
Dorcas M M FarrellChristopher Glidewell

Abstract

In the 1:1 adducts C(12)H(10)N(2).C(4)H(6)O(6) formed between 1,2-bis(4'-pyridyl)ethene and racemic tartaric acid [(I), triclinic P1;, Z' = 1] and (2R,3R)-tartaric acid [(II), triclinic P1, Z' = 2], the ionic components are linked by hard hydrogen bonds into single sheets, which are further linked by C-H.O hydrogen bonds. In the analogous adducts C(10)H(18)N(2).C(4)H(6)O(6) formed by 4,4'-bipyridyl with racemic tartaric acid [(III), triclinic P1;, Z' = 1] and the chiral acid [(IV), monoclinic P2(1), Z' = 1], the hard hydrogen bonds generate bilayers which are again linked by C-H.O hydrogen bonds. Piperazine forms a 1:1 salt [((C(4)H(10)N(2))H(2))(2+)].[(C(4)H(4)O(6))(2-)] with (2R,3R)-tartaric acid [(V), monoclinic P2(1)] sheets, which are linked by the cations to form a pillared-layer framework. In each of the 1:2 salts formed by racemic tartaric acid with piperazine [(VI), monoclinic P2(1)/n, Z' = 0.5] and 1,4-diazabicyclo[2.2.2]octane (DABCO) [(VII), monoclinic P2(1)/n, Z' = 0.5], the cation lies across a centre of inversion, with the [(HN(CH(2)CH(2))(3)NH)(2+)] cation disordered over two sets of sites: in both (VI) and (VII) the anions form a three-dimensional framework encapsulating large voids which accommodate the cation...Continue Reading

Citations

Jan 1, 2008·Acta Crystallographica. Section E, Structure Reports Online·Ge SongWei Li
Oct 8, 2013·Acta Crystallographica. Section C, Crystal Structure Communications·Balasubramanian SridharKrishnan Ravikumar
Jul 9, 2008·ChemSusChem·Haixiang GaoJean'ne M Shreeve

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