Glycosylated tris-bipyridine ferrous complexes for probing a mechanism behind carbohydrate-carbohydrate interactions: Spatial carbohydrate packing of glycoclusters changes on additions of salts in carbohydrate- and anion-dependent manners

Add time:07/16/2019    Source:sciencedirect.com

2,2′-Bipyridines containing two β-maltoside, β-lactoside, or β-isomaltoside appendages were prepared and successively complexed with ferrous ion to afford hexavalent glycoclusters having tris-bipyridine ferrous complex cores. Each of these metalloglycoclusters showed unique UV–vis and CD spectral changes upon addition of chloride, nitrate, and sulfate salts in carbohydrate- and anion-dependent manners. The results indicate that spatial carbohydrate packing of the metalloglycoclusters changes upon addition of these anions and that different anions stabilize different carbohydrate packings. Furthermore, the sulfates specifically enhance the rheological properties of aqueous solutions containing the metalloglycocluster containing β-lactoside appendages.

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