Download PDF by D. P. Graddon, H. Taube, A. G. Maddock: An Introduction to Co-ordination Chemistry

By D. P. Graddon, H. Taube, A. G. Maddock

ISBN-10: 0080032370

ISBN-13: 9780080032375

An creation to Co-Ordination Chemistry, moment variation covers the basic elements of co-ordination chemistry. The identify is designed to introduce the readers to the fundamental ideas and theories that govern co-ordination chemistry.
The textual content first studies the background of co-ordination chemistry, after which proceeds to discussing the trendy theories of co-ordination chemistry. subsequent, the choice covers transition steel stereochemistry. bankruptcy IV talks in regards to the balance of complicated salts, whereas bankruptcy V bargains with the stabilization of oxidation states. The textual content additionally covers carbonyls and II-complexes. within the final bankruptcy, the name offers the sensible purposes of co-ordination chemistry.
The booklet may be of significant use to scholars, researchers, and practitioners of chemistry similar disciplines.

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Sample text

Some typical values are shown in Table 2. T A B L E 2. MAGNETIC M O M E N T S OF 4-METHYLPYRIDINE COMPLEXES OF C O B A L T ( I I ) H A L I D E S (BOHR MAGNETONS) Tetrahedral Octahedral CoI2(4-mepy)2 4-49 CoBr2(4-mepy)2 4-41 CoCl2(4-mepy)2 4-48 CoI2(4-mepy)4 5-04 CoBr2(4-mepy)4 5 04 CoCl2(4-mepy)4 4-94 For a i/8-ion the spin only moment is 2-83/3, but an orbital contribution of up to about 0-4/3 leads to observed moments in the range 2-9-3-3 for octahedral nickel(II) compounds. In this case, tetrahedral compounds have rather higher moments, ranging up to about 4/3.

Steric considerations of this sort appear to provide the most satis­ factory explanation of variations of co-ordination number in complexes of ions in the second short and first long periods. Spectrochemical Series So long as the point-charge crystal-field model is retained, it is not possible to account for the position of the various ligands in the spectro­ chemical series, but if this model is modified so as to recognize that position in the series represents the ability to discriminate between de and ί/γ-orbitals, and not the absolute effect of ligands on the d-orbital energies, it becomes possible to account for the series by an extension of the Sidgwick-Powell approach.

Replacement of water by ligands further to the right in the spectro­ chemical series raises the ligand field, and will eventually cause spin pairing when Δ becomes greater than Π. When Δ and Π are only slightly different in the hydrates this change can be expected with ligands only slightly to the right of water in the series, but when, as in the [Fe(H20)6]3+ ion, Π is much greater than Δ, the only complexes which can be expected to have the low-spin configuration are those with ligands on the far right of the series; it is thus found that, whereas the only cobalt(III) complexes which have the high-spin configuration are the fluorides, all iron(III) complexes have the high-spin configuration except those with cyanide, dipyridyl, phenanthroline and related ligands.

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An Introduction to Co-ordination Chemistry by D. P. Graddon, H. Taube, A. G. Maddock

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