Abstract
A suspension of (−)-gallocatechin gallate (GCg) and caffeine in water afforded two kinds of complexes, the 1:2 and 2:2 complexes of GCg and caffeine. The crystal structures of the two complexes were determined by X-ray crystallography. The driving force for the formation of the 1:2 and 2:2 complexes was thought to be mainly π–π interactions between the A, B′ rings of GCg and the six-membered rings of caffeines, and those between the B ring of GCg and caffeine, the B′ ring of GCg and caffeine, and the A rings of GCgs, respectively.
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