Coordination chemistry nomenclature

Development of Coordination Chemistry Since 1930 Coordination Numbers and Geometries Nomenclature of Coordination Compounds Cages and Clusters Isomerism in Coordination Chemistry Ligand Field Theory Reaction Mechanisms... 

We illustrate the nomenclature introduced above in an example taken from coordination chemistry. In fact, equilibrium species of interesting complexity are commonly encountered in coordination chemistry and to a large extent coordination chemists have developed the principles of equilibrium studies. Consider the interaction of a metal ion M (e.g. Cu2+) with a bidentate ligand L (e.g. ethylenediamine, en) in aqueous solution. For work in aqueous solution the pH also plays an important role and thus, the proton concentration H (=[ff+]), as well as several differently protonated species, need to be taken into account. Using the nomenclature commonly employed in coordination chemistry, there are three components, M, L, and H. In aqueous solution they interact to form the following species, HL, H2L, ML, Mia, ML3, MLH, MLH1 and OH. (In fact, more species are formed, e.g. ML2H 1, but the above selection will suffice now.) The water molecules are usually not defined as additional components. The concentration of water is constant and its value is taken into the equilibrium constants. 

TRANSIENT-STATE KINETIC METHODS CHEMICAL KINETICS TRANSITION COORDINATE REACTION COORDINATE PHYSICAL ORGANIC CHEMISTRY NOMENCLATURE... 

Oligophenanthrolines, 46 176 Oligophosphates, 4 37-41 glasses, 4 38-41 Oligopyridines, 46 175, 176 coordination chemistry, 30 69-121, see also specific compound bonding modes, 30 72-76 history, 30 69-71 nomenclature, 30 71 stabilization, 30 71-72 a w-Oligosilanediols, 42 220-222 Omadine, 36 39... 

Generally, nomenclature systems use a base on which the name is constructed. This base can be derived from a parent compound name such as sil (from silane) in substitutive nomenclature (mainly used for organic compounds) or titan a central atom name such as cobalt in additive nomenclature (mainly used in coordination chemistry). 

With the discoveries that led to the founding of coordination chemistry by Alfred Werner and others at the start of the 20th century, and the concomitant demise of constant valency theories, the utility of additive nomenclature once again became evident and was the nomenclature pattern used by Werner and his contemporaries in their publications. 

In conventional organic nomenclature, a polymer is not considered to be an isomer of the repeating molecular unit, because the molecular formulas formally differ. This is a somewhat arbitrary distinction, however, because it is never really an isolated, single molecule of monomer that is compared with the polymer. In an aggregate of monomer molecules, intermolecular forces exist and the constitutional difference from an aggregate of polymer molecules is simply that some intermolecular forces have been converted into true chemical bonds. In any case, the term polymerization isomerism has had a long-standing use in coordination chemistry. It may refer... 

Nomenclature, Abbreviations, and Coordination Chemistry of Metal Porphyrinates... 

We note that the last described approach is seldom used in coordination chemistry. On the contrary, the r -notation of F.A. Cotton is the most widely applied. The nomenclature of coordination compounds according to IUPAC is fully described in Refs. 3 and 10. 

The separation of coordination compounds into four types, as described above (a) encompasses practically all types of complexes reported in modern coordination chemistry [1,2,10,16,34,124-127] (b) is clear and informative with respect to a given molecule in a coordination compound as a whole, and does not rely on its individual portions (c) concentrates its attention on the special features of some types of metal complexes (d) follows from the modern approach to study the structures of metal complexes [16,34,125,126], together with their systematic nomenclature [122,123]. 

Fernelius, W. C. Nomenclature of Coordination Compounds from Advances In Chemistry Series, No. 8, 9-37, American Chemical Society (1953). International Union of Pure and Applied Chemistry Nomenclature of Inorganic Chemistry, J. Am. Chem. Soc82, 5523 (1960). 

Another procedure that was used in the early days of coordination chemistry was to refer to the compound by its color. For example, [Co(NH3)6]C13, an intensely yellow compound, was known as luteo cobaltic chloride because the prefix luteo indicates the yellow color. Similarly, [Co(NH3)5C1]C1 was known as purpureo cobaltic chloride because of its purple color, but this is not a satisfactory system of nomenclature to deal with a very large number of compounds. 

Review your knowledge of coordination chemistry with respect to nomenclature Why is the molecule shown in Fig. 19.27 the A" isomer ... 

Nomenclature of Coordination Compounds, T.E. Sloan, Vol. 1, Chapter 3, Comprehensive Coordination Chemistry, Pergamon Press, 1987 Inorganic Chemical Nomenclature, Principles and Practice, B.P. Block, W.H. Powell and W.C. Fernelius, American Chemical Society, Washington, DC, 1990 Chemical Nomenclature, KJ. Thurlow, Kluwer Academic Pub., 1998. 

Stan s some one hundred articles dealt with the synthesis, structure, stereochemistry, and biological properties of coordination compounds, including the anticancer activity of platinum complexes optical rotatory dispersion circular dichroism the Pfeiffer Effect in metal complexes inorganic nomenclature and the application of computer techniques to chemical and information problems. A prominent educator, he edited three books on inorganic and coordination chemistry. 

This simple group of rules clearly does not by any means cover the full set of naming rules that apply to deal with modern coordination chemistry. However, they go some of the way to allowing you to navigate around nomenclature for the relatively simple complexes you will likely meet. It is a difficult task to name complicated compounds - which is why, even in the chemical research literature, people sometimes choose to avoid it as much as possible. For some, nothing compares with a drawing of the complex molecule and a trivial name(s) for the ligand(s) involved ... 

The text is presented as a suite of sequential chapters, and an attempt has been made to move beyond the pillars of the subject and provide coverage of synthesis, physical methods, and important bioinorganic and applied aspects from the perspective of their coordination chemistry in the last four chapters. While it is most appropriate and recommended that they be read in order, most chapters have sufficient internal integrity to allow each to be tackled in a more feral approach. Each chapter has a brief summary of key points at the end. Further, a limited set of references to other publications that can be used to extend your knowledge and expand your understanding is included at the end of each chapter. Topics that are important but not central to the thrust of the book (nomenclature and symmetry) are presented as appendices. 

BUrgi, H. B., in Perspectives in Coordination Chemistry, Williams, A. F., Floriani, C., Mer-bach, A.E. (eds.), Verlag Helvetica Chimica Acta, Basel, VCH, Weinheim, 1992, 1-29 This nomenclature, which expresses the analogy between the three types of correlation, was first suggested in [55]... 

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