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Synthesis, crystal structure and thermal properties of a new polymorphic modification of diisothiocyanatotetrakis(4-methylpyridine)-cobalt(II).
- Source :
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Acta Crystallographica Section E: Crystallographic Communications . May2024, Vol. 80 Issue 6, p677-681. 11p. - Publication Year :
- 2024
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Abstract
- The title compound, [Co(NCS)2(C6H7N)4] or Co(NCS)2(4-methyl-pyridine)4, was prepared by the reaction of Co(NCS)2 with 4-methyl-pyridine in water and is isotypic to one of the polymorphs of Ni(NCS)2(4-methyl-pyridine)4 [Kerr & Williams (1977). Acta Cryst. B33, 3589-3592 and Soldatov et al. (2004). Cryst. Growth Des. 4, 1185-1194]. Comparison of the experimental X-ray powder pattern with that calculated from the single-crystal data proves that a pure phase has been obtained. The asymmetric unit consists of one CoII cation, two crystallographically independent thio-cyanate anions and four independent 4-meth-yl-pyridine ligands, all located in general positions. The CoII cations are sixfold coordinated to two terminally N-bonded thio-cyanate anions and four 4-methyl-pyridine coligands within slightly distorted octa-hedra. Between the complexes, a number of weak C-H⋯N and C-H⋯S contacts are found. This structure represent a polymorphic modification of Co(NCS)2(4-methyl-pyridine)4 already reported in the CCD [Harris et al. (2003). NASA Technical Reports, 211890]. In contrast to this form, the crystal structure of the new polymorph shows a denser packing, indicating that it is thermodynamically stable at least at low temperatures. Thermogravimetric and differential thermoanalysis reveal that the title compound starts to decomposes at about 100°C and that the coligands are removed in separate steps without any sign of a polymorphic transition before decomposition. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20569890
- Volume :
- 80
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Acta Crystallographica Section E: Crystallographic Communications
- Publication Type :
- Academic Journal
- Accession number :
- 177737871
- Full Text :
- https://doi.org/10.1107/S2056989024004997