Isomerism in complexes

Hydride complexes NMR spectra Hydroxide Infrared spectra Isocyanide complexes Isomerism in complexes... 

Isomerism in complexes of bidentate ligands with enantiotopic donor atoms. R. E. Tapscott, J. D. Mather and T. F. Them, Coord. Chem. Rev., 1979, 29, 87-127 (254). 

Mechanisms leading to geometrical isomerization in complexes of this type resemble those already discussed with M(AA,)3 and M(Li)(L2), Secs. 7.6.2 and 7.6.3. As well as twist mechanisms, dissociation of either the unidentate ligand or one-ended dissociation of the... 

Phosphorus-containing ligands show manifold influences on oxidation states and isomerisms in complexes and the extent of associations (see Chap. 3). The directing influence of varying properties in phosphines and phosphites was experimentally investigated for allyl-Ni-ligand complexes, e.g. with respect to ... 

It is found on analysis of the problem that when only two d orbitals are available for combination with the s and p orbitals six equivalent bond orbital- of strength 2.923 (nearly as great as the maximum 3 for the best spd hybrid) can be formed, and that these six orbitals have their bond directions toward the corners of a regular octahedron. We accordingly conclude that complexes such as [CoCNHs ], [PdClc]—, and [PtCle] — should be octahedral in configuration. This conclusion is of course identical with the postulate made by Werner to account for isomerism in complexes with different substituent groups,1 and verified also by the x-ray examination of Co(NH8)el3, (NHOaPdCU, (NH4)2 PtCl , and other crystals (see Fig. 5-1). 

Consideration of the octahedral model in accordance with symmetry knowledge also has been used to predict the presence of the mirror isomerism in complex compounds with definite content and structure. Its discovery was made by Werner in 1911, and is a confirmation of the coordination theory. ... 

Characteristically, metal ions form complexes that can exist as several isomers. This is a consequence of the stereochemistry, resulting from high numbers of ligands, adopted by most metal complexes. The best known examples of isomerism in complexes are geometrical isomers (such as cis and trans isomers), but these are not the sole type. We can, following a traditional approach, divide the area into two classes constitutional (or structural) isomerism and stereoisomerism. 

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