Mutual influence of ligands in main group element coordination compounds
| Autor: | Yu. A. Buslaev, E. M. Shustorovich |
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| Rok vydání: | 1976 |
| Předmět: | |
| Zdroj: | Inorganic Chemistry. 15:1142-1147 |
| ISSN: | 1520-510X 0020-1669 |
| DOI: | 10.1021/ic50159a033 |
| Popis: | basis of the orbitally deficient scheme of the structure of these compounds. It is shown that the directing influence of ligand X in quasi-octahedral and quasi-square complexes AXL, depends on the oxidation state of the central atom A. If A is not of the highest oxidation state (formally preserving ns2 “lone pair”), in complexes AXL, the trans influence must always take place. If A is of the highest oxidation state, the MIL regularities are of more complicated character. In particular, contrary to transition metal complexes MXL,, a strong u donor X (of the H or CH3 type) can cause the strengthening of the A-Ltrans bond at the expense of the weakening of the A-L,i, bonds, a multiply bonded ligand X (of the terminal oxygen type) can cause the relative cis weakening, a decrease of the A-F bond strength can be accompanied by an increase of spin-spin coupling constant IJ(A-F)I, etc. The results obtained agree with the experimental data and permit a number of predictions to be made. The reasons for both similarity and difference in the displays of the MIL in transition metal MXL, and main group AXL, complexes are discussed. Trans and Cis Influence. The mutual influence of ligands (MIL) in complexes is considered to be a fundamental problem in coordination chemistry. Here we shall be interested only in the directing influence of ligands, the most important display of which is the trans influence. As the term ‘‘trans influence” is used to describe rather heterogeneous things (see, for example, the latest relevant it is useful to clarify the |
| Databáze: | OpenAIRE |
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