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Published on: September 8, 2013
Thiocyanates of nickel and caesium: Cs2NiAg2(SCN)6.2H2O and CsNi(SCN)3
1Universität Wien-Geozentrum, Institut für Mineralogie und Kristallographie, Althanstrasse 14, A-1090, Austria. michel.fleck@univie.ac.at
Abstract:
The crystal structures of dicaesium nickel disilver hexathiocyanate dihydrate, Cs2NiAg2(SCN)6.2H2O, (I), and caesium nickel trithiocyanate, CsNi(SCN)3, (II), have been determined by single-crystal X-ray diffraction at 273 K. Compounds (I) and (II) are monoclinic, with P21/c and P21/n symmetry, respectively. In (I), the Ni atom lies on an inversion centre; in (II), there are two independent Ni atoms, each of which lies on an inversion centre. The coordination polyhedra and the bonding schemes in the structures are discussed.
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Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...

