Influence of lower rim C-methyl group on crystal forms and metal complexation of resorcinarene bis-crown-5
Helttunen, K., Tero, T.-R., & Nissinen, M. (2015). Influence of lower rim C-methyl group on crystal forms and metal complexation of resorcinarene bis-crown-5. CrystEngComm, 17(19), 3667-3676. https://doi.org/10.1039/C5CE00311C
Julkaistu sarjassa
CrystEngCommPäivämäärä
2015Tekijänoikeudet
© Royal Society of Chemistry 201. This is a final draft version of an article whose final and definitive form has been published by Royal Society of Chemistry.
C-methyl resorcinarene bis-crown-5 (1) with pendant methyl groups at the lower rim was
prepared and crystallized in various solvent mixtures with and without selected metal salts.
The crystal structures of two polymorphic forms of unsolvated 1 (1-I and 1-II), three solvates
(acetonitrile, chloroform and dichloromethane-methanol), and three metal complexes with
silver and cesium salts were obtained. The lower rim methyl groups and the block shape of the
host promote crystal packing in brick-wall type assemblies, in which the binding cavities are
efficiently filled by the crown bridges. Thus, solvents are found in the interstitial space or
coordinated to the crown bridges on top of the cavity, whereas more strongly binding metal
cations are able to occupy the cavity. The chloroform solvate proved to be a relatively labile
crystal form, which transformed to unsolvated form (1-I) over time. Resorcinarene monocrown-5
(2) was obtained as a minor product of the bridging reaction. Two solvate structures
(acetonitrile and chloroform-water) of 2 are also reported, providing an example of the effect
of the missing crown bridge on the solvate structures.
...
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Royal Society of ChemistryISSN Hae Julkaisufoorumista
1466-8033Asiasanat
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