Electron Paramagnetic Resonance Study of Copper(II) Fluosilicate Hexahydrate
| dc.creator | De, Dilip Kumar, STHANAPATI, J., GHOSHAL, A. K., PAL, A. K. | |
| dc.date | 1982 | |
| dc.date.accessioned | 2025-03-27T18:59:16Z | |
| dc.description | An electron paramagnetic resonance study was performed on single crystals of copper fluosilicate hexahydrate. EPR signals correspond to three tetragonally distorted pctahedral Cu(II) ions (A site) with g values: g11 = 2.390, gJ. .= 2.093, and ·one regular octahedral Cu(II) ion (B site) with g = 2.093. The spectra are thus quite different from those observed earlier by Bleaney and Ingram in Cu(II):ZnSiF6 • 6H20. Fluosilicate hexahydrates of divalent metals belong to a series of crystals wellsuited for X-ray, magnetic susceptibility and anisotropy, electron paramagnetic resonance, optical, and other studies (J-4). Observations of an isotropic EPR signal at 90 K and above and anisotropic EPR signals at 20 K by Bleaney and Ingram (J) in Cu:ZnSiF6 • 6H20 provided the first experimental evidence of the Jahn-Teller effect. A determination of crystal structures of this series by Ray eta/. (2, 3) has revealed that copper(II) fluosilicate hexahydrate (3), contrary to earlier belief, is not isomorphous with zinc fluosilicate hexahydrate. The structure is still rhombohedral (space group R3) with a cell four times as large as that supposed earlier. The unit cell, which has dimensions a = b = 18.18 A and c = 9.857 A, contains three magnetically nonequivalent tetragonally distorted Cu(II) · 6H20 octahedra (Cu-0(1) = 1.97 A, Cu-0(2) = 1.97 A, Cu-0(3) = 2.367 A) designated as the A sites; and one regular Cu(II) · 6H20 octahedron (Cu-0 = 2.074 A) designated as the B site. It was therefore considered of interest to study EPR in single crystals of copper fluosilicate hexahydrate with the object of unravelling the nature of the ligand fields in a crystal where two types of Cu(II) complexes coexist. | |
| dc.format | application/pdf | |
| dc.identifier | http://eprints.covenantuniversity.edu.ng/5086/ | |
| dc.identifier.uri | https://repository.covenantuniversity.edu.ng/handle/123456789/34391 | |
| dc.language | en | |
| dc.subject | Q Science (General), QC Physics | |
| dc.title | Electron Paramagnetic Resonance Study of Copper(II) Fluosilicate Hexahydrate | |
| dc.type | Article |
Files
Original bundle
1 - 1 of 1