The coordination polymer {[Cd 2 (4,4‘-pytz) 3 (μ-NO 3 )(NO 3 ) 3 (MeOH)]} ∞, 1, displays a unique polyknotted structure in which each Cd(II) center is coordinated by three pyridyl N-donors arranged in an approximate T-shaped geometry to form a ladder motif. Within this structure, each ladder is interpenetrated perpendicularly by two other ladders. Significantly, each of the Cd(II) centers at the intersections of one ladder is bridged by a coordinated NO 3 - anion to a Cd(II) center located at the corner of a square section of one of the perpendicularly interpenetrated ladders. Thus, all the ladders are linked together to give a three-dimensional polymer where the overall architecture is constructed of one molecule in a fused “polyknot”.
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Withersby et al. (2000) studied this question.
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