ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
From a solution containing a mercury(II)salt and thiocyanate (ratio of about 1:4), a solution of a cobalt(II) salt precipitates, in presence of benzene, a bright pink mikrocrystalline compound of the exact composition: {CoHg2(SCN)6, C6H6}, which can be also obtained in well developed cristals. Reflexion and IR. Spectra show that CoII is octahedrally coordinated and that all six thiocyanate groups serve to bridge the two metal atoms: Hg…SCN…Co. It is suggested that the molecule of benzene formes π-bonds simultaneously with two mercury atoms, being the fourth ligand of each Hg2+. Benzene can be replaced by toluene, the three xylenes, naphthalene, anthracene, but not by aliphatic cyclic hydrocarbons. CoII can be replaced by octahedral NiII and CdII, but not by ZnII and CuII. The compounds are thermodynamically unstable. At about 100°C the cobalt-benzene compound loses the hydrocarbon rapidly and the colour of the solid residue turns from pink to a brilliant blue, due to the formation of a 1:1 mixture of {CoHg(SCN)4} and {Hg(SCN)2}. The compound {CoHg2(SCN)6} is non-existent, and it is unlikely therefore that it can serve as a host-lattice for benzene in a clathrate.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19620450306
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