Abstract
The self-assembly of an exoditopic N-donor ligand (3-py-3-py) with HgX2
(X = Cl, Br, I) was investigated. X-ray structure analysis shows that
all the compounds have an infinite one-dimensional structure and the
Hg(II) ions are in a distorted trigonal pyramidal N2HgX2 geometry. Our
results indicate that the coordinated anion can control the structural
motif of the resulting one-dimensional coordination polymers through
cooperative weak noncovalent interactions. In the case of
Hg-2(mu-3-py-3-py)(2)Cl-4(n) (1) and
Hg-2(mu-3-py-3-py)(2)Br-4(n) (2), the 1D zigzag chains are
constructed as a consequence of cooperative noncovalent interactions,
such as hydrogen bonds, halogen center dot center dot center dot pi and
pi-pi interactions. However, for Hg(mu-3-py-3-py)I-2(n) (3), the
coordinated iodide ion tunes the folding of the 1D structure into a
helical array by bifurcated C-H center dot center dot center dot I-Hg
hydrogen bonds and pi-pi interactions in a cooperative manner.
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