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Issue 6, 2009
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Phase-separated hydrogen-bonded chloride ion–water–oxonium ion sheets and protonated 4′-(4-bromophenyl)-2,2′:6′,2″-terpyridine stacks, and condensation products of 2-acetylpyridine and benzaldehydes revisited

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Abstract

During attempts to produce layered materials involving protonated 4′-(4-bromophenyl)-2,2′:6′,2″-terpyridine (1) and tetrahalometallate anions, we have serendipitously crystallized the doubly protonated ligand in the form of [H21][H3O]Cl3·3H2O. In the solid state, the components of this hydrate separate into two well defined domains: rows of stacks of hydrogen bonded {[H21]Cl}+ units interspersed by puckered (6,3) sheets of hydrogen bonded chloride ions, water molecules and oxonium ions. Without careful control of the conditions during the preparations of 1 and 4′-(4-cyanophenyl)-2,2′:6′,2″-terpyridine (2), cyclohexanol-based condensation products 3 and 4 are observed. Single crystal structures of these racemates confirm a (1SR,2RS,3SR,4SR,5SR)-stereochemistry. While racemic 4 crystallizes in the centrosymmetric space group P-1, 3·CHCl3 crystallizes in the non-centrosymmetric space groupFdd2, and the consequences on the packing of molecules are described.

Graphical abstract: Phase-separated hydrogen-bonded chloride ion–water–oxonium ion sheets and protonated 4′-(4-bromophenyl)-2,2′:6′,2″-terpyridine stacks, and condensation products of 2-acetylpyridine and benzaldehydes revisited

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Supplementary files

Article information


Submitted
07 Nov 2008
Accepted
04 Mar 2009
First published
28 Apr 2009

CrystEngComm, 2009,11, 1014-1021
Article type
Paper

Phase-separated hydrogen-bonded chloride ion–water–oxonium ion sheets and protonated 4′-(4-bromophenyl)-2,2′:6′,2″-terpyridine stacks, and condensation products of 2-acetylpyridine and benzaldehydes revisited

E. C. Constable, G. Zhang, C. E. Housecroft, M. Neuburger and S. Schaffner, CrystEngComm, 2009, 11, 1014
DOI: 10.1039/B819927B

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