Organic matter ligand types

The Cu ion is used as an example of a metal that complexes with a high degree of selectivity on polyphenolic groups of soil organic matter. One of these groups is the biphenol (catechol) type, which dissociates to form the ligand... 

The subject matter in this review is organized according to groups from the periodic table. This complements an earlier review that contained organometallic systems in which the material was arranged first by liquid-crystal phase behavior and then by ligand type. It is hoped that the interested reader will cross-reference these two sources to enhance their appreciation of the subject. 

The division of the subject matter concentrates primarily on the type of liquid crystal phase formed and, to a large degree, this is a reflection of molecular shape, although as the reader will see this is not such a clear-cut distinction where polycatenar liquid crystals are concerned. However, within these broader classifications, material is then organized paying attention to the ligand types used to form the complexes. This is not a unique classification, but it does provide some sort of framework within which the field may be viewed. 

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