Treatment of cadmium(II) thio-and selenocyanate with pyridazine leads to the formation of new cadmium(II) thiocyanato and selenocyanato coordination compounds 2 ] n (2B) and [Cd(NCS) 2 (pyridazine)] n (1C) which were characterised by single-crystal X-ray diffraction. Investigations of the thermal degradation behaviour of 1A and 2A using simultaneous differential thermoanalysis and thermogravimetry as well as X-ray powder diffraction, IR-and Raman spectroscopy prove that on heating, the pyridazine-rich compounds 1A and 2A decompose in a stepwise manner leading in the first TG step to the formation of the pyridazine-
Reaction of Zn II and Cd II thiocyanate or selenocyanate with pyrazine leads to the formation of new Zn II and Cd II coordination compounds. The structures of [Zn(NCSe) 2 (pyrazine) 2 ] n (1A), [Cd(NCS) 2 (pyrazine) 2 ] n (2A) and [Cd(NCSe) 2 (pyrazine) 2 ] n (3A) consist of octahedrally coordinated metal cations which are surrounded by two terminal N-bonded anions and two μ 2 -bridging pyrazine molecules. The metal cations are connected via the pyrazine ligands into layers, which are further linked by weak intermolecular S···S respectively Se···Se interactions. Investigations on the thermal degradation behavior of 1A, 2A, and 3A using simultaneous differential thermoanalysis and * Prof. Dr. C. Näther
Reaction of zinc(II) and cadmium(II) selenocyanate with pyridine leads to the formation of new zinc(II) and cadmium(II) selenocyanato coordination compounds. The crystal structures of bis(selenocyanato‐N)‐tetrakis(pyridine‐N) zinc(II) (1) and bis(selenocyanato‐N)‐tetrakis(pyridine‐N) cadmium(II) (2) consist of discrete complexes in which the metal cations are octahedrally coordinated by two terminal N‐bonded selenocyanato anions and four pyridine molecules. Investigations on the thermal degradation behavior of 1 and 2 using simultaneous differential thermoanalysis and thermogravimetry as well as X‐ray powder diffraction, IR‐ and Raman spectroscopy, prove that on heating the pyridine‐rich compounds 1 and 2, a stepwise decomposition is observed, which leads to the formation of the pyridine‐deficient compounds bis(selenocyanato‐N)‐bis(pyridine‐N) zinc(II) (3) and catena‐[bis(μ‐1,3‐selenocyanato‐N,S)‐bis(pyridine‐N) cadmium(II)] (4) as intermediates. Whereas the octahedral coordination of the CdII cations are unchanged in its pyridine‐deficient intermediate 4, that is build up of polymeric chains, the crystal structure of compound 3 consists of tetrahedrally coordinated ZnII atoms, which are surrounded by two N‐bonded selenocyanato anions and two pyridine ligands forming discrete complexes. The structures and the thermal reactivity are discussed and compared with that of related transition metal isothiocyanates and selenocyanates with pyridine.
In the title compound, [CdK2(NCSe)4(H2O)2]n, the cadmium(II) cation is situated on a twofold rotation axis and is coordinated in a slightly distorted tetrahedral geometry by two symmetry-related μ-1,1,1,3 and two-symmetry related μ-1,1,3,3 bridging selenocyanate anions, all of which are Se bonded. These bridging selenocyanate anions are further coordinated to two symmetry-related potassium ions. Each of the potassium ions is coordinated by one terminally bonded water molecule and six selenocyanate anions, two of which are crystallographically independent. The asymmetric unit consists of one cadmium and one potassium cation, two bridging selenocyanate anions and one water molecule. The polymeric subunits are further connected via the selenocyanate anions into a three-dimensional coordination network. In this coordination network, intramolecular hydrogen bonds between neighbouring water molecules can be found.
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