Steric constraints and addition reactions in platinum(II) complexes containing 2,9-dimethyl-1,10-phenanthroline (Me2-phen). X-ray crystal structures of [PtBr2(Me2-phen)] and [PtI2(Me2-phen)]
| Autor: | Cornelius G. van Rooyen, Robin J. H. Clark, Francesco Paolo Fanizzi, Derek A. Tocher, Concetta Pacifico, Giovanni Natile |
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| Rok vydání: | 1995 |
| Předmět: |
Steric effects
Chemistry Crystal structure Inorganic Chemistry Nitrosobenzene Crystallography symbols.namesake chemistry.chemical_compound Materials Chemistry symbols Proton NMR Van der Waals radius Reactivity (chemistry) Physical and Theoretical Chemistry Monoclinic crystal system Coordination geometry |
| Zdroj: | Inorganica Chimica Acta. 235:205-213 |
| ISSN: | 0020-1693 |
| DOI: | 10.1016/0020-1693(95)90062-b |
| Popis: | [PtX 2 (Me 2 -phen)] complexes (X Cl ( 1 ), Br ( 2 ), I ( 3 ); Me 2 -phen=2,9-dimethyl1,10-penanthroline) react with dimethylsulfoxide, dimethylsulfide and nitrosobenzene to give the addition products [PtX 2 (Me 2 -phen)(L)] (L DMS, 1–3a ; DMSO, 1–3b ; PhNO, 1–3c ) containing mono-coordinated Me 2 -phen. The equilibrium constants for the addition reactions ( K f ) have been determined by 1 H NMR spectroscopy and found to be strongly dependent upon the bulkiness of the halogen atoms; log K f increases linearly with the van der Waals radius of the halogens. The crystal structures of the complexes [PtBr 2 (Me 2 -phen ( 2 ) and [PtI 2 (Me 2 -phen)] ( 3 ) have been determined by X-ray diffraction methods. Crystal data for 2 : monoclinic, space group P 2 1 / n , a = 12.155(4), b = 7.933(2), c = 14.522(2) A , β = 93.74(2)°, Z = 4, R = 0.046 . Crystal data for 3 : monoclinic, space group P 2 1 / n , a = 12.542(2), b = 7.957(1), c = 14.976(3) A , β = 94.49(3)°, Z = 4, R = 0.036 . The distortions in the square-planar coordination geometry are compared to those found for the analogous chloro species and correlated to differences in reactivity. |
| Databáze: | OpenAIRE |
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