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Journal of Coordination Chemistry Volume 64, 2011 - Issue 6
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Original Articles

A cyanide-bridged 1-D helical chain involving both four- and six-coordinate nickel(II)

Anangamohan Panja Postgraduate Department of Chemistry, Panskura Banamali College, Panskura RS, Purbamedinipur, West Bengal 721152, IndiaCorrespondence[email protected]
Pages 987-995 | Received 18 Oct 2010, Accepted 20 Dec 2010, Published online: 03 Mar 2011
 
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Abstract

A cyanide-bridged coordination polymer, {[Ni(tren)][Ni(CN)4]} n (tren = tris(2-aminoethyl)amine), has been synthesized by self-assembly of cis-[Ni(tren)]2+ and [Ni(CN)4]2− building blocks. In the molecular structure, the paramagnetic cis-[Ni(tren)]2+ cations are bridged by diamagnetic [Ni(CN)4]2− anions through two cis-cyanides to form a 1-D helical chain of {[Ni(tren)][Ni(CN)4]} n . The compound crystallizes with a centrosymmetrical space group, P21 /n, in which the helical chains are packed in alternating right- and left-handed chiralities with a helical pitch of 10.2566(3) Å (equal to the length of the b-axis), leading to the formation of a racemic compound. The crystal packing is stabilized by moderately strong hydrogen-bonding between primary amines of tren and nitrogens of terminal cyanide.

Acknowledgments

The author thanks Prof. Pradyot Banerjee, Indian Association for the Cultivation of Science, Kolkata, for useful suggestions during the course of this work.

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