A stream of water molecules, held together by hydrogen bonding, forms a left-handed helix within the helical channels of a left-handed staircaselike metal coordination polymer. The result is a novel helix-in-a-helix structure. The water-filled channel can be seen on viewing the coordination polymer along the b axis (see picture; C gray, N blue, Ni green, O red).
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Sreenivasulu et al. (2004) studied this question.
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