Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Chemistry and Pharmacology
The one-dimensional chain catena-poly[[aqua(2,2′:6′,2′′-terpyridyl-κ3N)nickel(II)]-μ-cyano-κ2N:C-[bis(cyano-κC)nickelate(II)]-μ-cyano-κ2C:N], [Ni(terpy)(H2O)]-trans-[Ni-μ-(CN)2-(CN)2]n or [Ni2(CN)4(C15H11N3)(H2O)], consists of infinite linear chains along the crystallographic [10\overline 1] direction. The chains are composed of two distinct types of nickel ions, paramagnetic octahedral [Ni(terpy)(H2O)]2+ cations (with twofold crystallographic symmetry) and diamagnetic planar [Ni(CN)4]2− anions (with the Ni atom on an inversion center). The [Ni(CN)4]2− units act as bidentate ligands bridging through two trans cyano groups thus giving rise to a new example of a trans–trans chain among planar tetracyanonickelate complexes. The coordination geometry of the planar nickel unit is typical of slightly distorted octahedral nickel(II) complexes, but for the [Ni(CN)4]2− units, the geometry deviates from a planar configuration due to steric interactions with the terpyridine ligands.
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