A 199Hg NMR spectroscopic study of two and three-coordinate methylmercury(II) complexes, [MeHgL]NO3
| Autor: | Peter Conrad Healy, Anthony Marker, Allan J. Canty, Peter F. Barron |
|---|---|
| Rok vydání: | 1978 |
| Předmět: |
chemistry.chemical_classification
Coupling constant Denticity Base (chemistry) Ligand Stereochemistry Organic Chemistry chemistry.chemical_element Biochemistry Mercury (element) Inorganic Chemistry NMR spectra database chemistry.chemical_compound Crystallography chemistry Pyridine Materials Chemistry Chelation Physical and Theoretical Chemistry |
| Zdroj: | Journal of Organometallic Chemistry. 144:371-379 |
| ISSN: | 0022-328X |
| Popis: | 199 Hg NMR spectra are reported for the complexes [MeHgL]NO 3 containing either two- (e.g. L = pyridine) or three-coordinate mercury (e.g. L = 2,2′-bipyridyl). For unidentate and bidentate ligands of similar basicity chelation with bidentate ligands to give three-coordinate mercury results in upfield shifts of 199 Hg resonances from that of the linear complexes. For complexes of unidentate ligands shifts correlate with changes in base strength of the ligands, and methyl substitution in the 2 position of pyridine appears to result in an upfield shift of ca. 30 ppm. Effects of substitution in the 2 position are very strong in complexes of unidentate 2-benzylpyridine and 3,3′-dimethyl-2,2′-bipyridyl. Comparison of the 199 Hg shifts with J( 1 H- 199 Hg) shows the coupling constant to be insensitive to substitution in the 2 position in linear complexes and is a function only of the ligand base strength. |
| Databáze: | OpenAIRE |
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