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Aromatenkomplexe von Quecksilber
Author(s) -
Baur R.,
Schellenberg M.,
Schwarzenbach G.
Publication year - 1962
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19620450306
Subject(s) - chemistry , benzene , thiocyanate , toluene , cobalt , mercury (programming language) , octahedron , naphthalene , inorganic chemistry , metal , molecule , medicinal chemistry , crystallography , crystal structure , organic chemistry , computer science , programming language
Abstract 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: {CoHg 2 (SCN) 6 , C 6 H 6 }, which can be also obtained in well developed cristals. Reflexion and IR. Spectra show that Co II 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 Hg 2+ . Benzene can be replaced by toluene, the three xylenes, naphthalene, anthracene, but not by aliphatic cyclic hydrocarbons. Co II can be replaced by octahedral Ni II and Cd II , but not by Zn II and Cu II . 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 {CoHg 2 (SCN) 6 } is non‐existent, and it is unlikely therefore that it can serve as a host‐lattice for benzene in a clathrate.