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Synfacts 2015; 11(5): 0485
DOI: 10.1055/s-0034-1380641
Synthesis of Materials and Unnatural Products
© Georg Thieme Verlag Stuttgart · New York

Turning the Caterpillar Track

Rezensent(en):
Timothy M. Swager
,
Maggie He
Liu S, Kondratuk DV, Rousseaux SA. L, Gil-Ramirez G, O’Sullivan MC, Cremers J, Claridge TD. W, Anderson HL * University of Oxford, UK
Caterpillar Track Complexes in Template-Directed Synthesis and Correlated Molecular Motion.

Angew. Chem. Int. Ed. 2015;
DOI: 10.1002/anie.201412293
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Publikationsverlauf

Publikationsdatum:
17. April 2015 (online)

 
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Key words

template-directed synthesis - molecular motion - exchange spectroscopy - porphyrin nanorings - oligo-pyridines

Significance

Oligo-pyridines have been used as templates to direct the synthesis of zinc-porphyrin nanorings. The authors showed that a hexapyridyl template directed the synthesis of a cyclic zinc-porphyrin hexamer, removal of one binding site on the hexapyridyl template produced a cyclic decamer and removal of two binding sites produced a cyclic octamer. An interesting discovery of these zinc-porphyrin nanorings is that while the nano­rings are static when they are coordinatively saturated with the binding sites on the pyridine templates, these assemblies undergo caterpillar track motion when coordinating to hexapyridyl templates with free binding sites.


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Comment

Zinc-porphyrin nanorings were purified by size exclusion chromatography and recycling gel permeation chromatography (GPC). The caterpillar track motion of these assemblies was studied by 1D exchange spectroscopy (EXSY) NMR. This is an elegant system demonstrating the control of correlated motions on molecular scale. Addition of [PdCl2(PhCN)2] halted the caterpillar track motion in these assemblies by binding palladium between the two hexapyridine templates.


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