Elements of Group VI

Brezina.and A. Hofmanova-Matejkova, Coll. Czech. Chem. Comm., 1973, 38, 3024. 

A kinetic study of the oxidation of sulphite ions to sulphate ions by gaseous oxygen in melts of lithium and potassium chlorides at temperatures between 414 and 504 °C has been carried out, and a possible reaction mechanism proposed.14 The interaction of oxygen at 20 °C with hydrogen sulphide presorbed at 55 °C and vice versa has been investigated.15 

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Thesis elements constitute the metallic elements of Group VI. They are characterised by the complexity of their compounds, especially the oxy-compounds. For example, the elements all form important complex oxides, and from these are derived highly complex oxy-salts and acids. 

For Oxygon, see this Series, Vol. VII., Part I. for Polonium, see Vol. III., Part I. a The general characteristics of the elements of Subdivision A are dealt with in this Series, Vol. VII., Part III., Chapter I. Those of the elements of Group VI. considered as a wholo are dealt with in VoCjVTI., Part I., Chapter I. 

It is difficult for the elements of group VI and VII to act as central atoms in n complexes. Vacant orbitals or coordination sites are generally necessary for the stabilization of a n complex. This would require high oxidation states of the group VI or VII elements, as illustrated by the structures V, W, and X for a series of cyclopentadienylsulfur complexes. It is therefore not surprising that attempts to generate complexes of this type so far have been unsuccessful (259). 

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