| | 1 | Author
| Michel Mégnamisi-Bélombé, Irene Jokwi, Emmanuel Ngameni, R. Obert Roux, Bernhard Nuber | Requires cookie* | | | Title
| X-Ray Structure, Electrochemical and Electronic Spectroscopic Examination of Cobaloximatic Acid: Hydro-fraw5-diiodobis(ethanedioximato(l-)-N,N')cobaltate(III). Extended Intermolecular O-H-O Bridging in the Solid  | | | | Abstract
| The structure of the cobaloximatic acid, hydro-rrans-diiodobis(ethanedioximato(l-)-N,N')cobaltate(III), has been determined by X-ray diffraction. Crystal data: C4H7CoI2N40 4, Mr = 487.87; monoclinic space group P2xta (C|h); a -10.795(7), b = 9.003(7), c = 11.881(6) Ä; ß = 97.29(6)°; V = 1145.35 Ä3; Z = 4; dc = 2.83 Mg n r3. Rw (R) = 3.6 (3.9)% for 3064 observed independent reflections and 148 parameters. The coordination geometry around Com is a dis torted (4 + 2) octahedron of four chelating equatorial N atoms and two apical iodides. The compound is most adequately formulated as a monovalent strong acid: H(Co(GH)2I2) (GH_ = ethanedioximate or glyoximate). The H atoms of the oxime groups are involved in the usual mframolecular, as well as in much stronger internlolecular O -H -O bridgings (O — Ointramol = 2.613-2.631, O — Ointervo, = 2.454 Ä). The "acidic" H atom of each molecule participates in the intennolecular bridging which extends throughout the structure, and propagates nearly parallel to the [101] crystallographic direction. The redox properties of the present compound were examined by cyclic voltammetry in acetonitrile solution at room tem perature. Redox waves attributed to the reduction of Co11 1 and to the oxidation of T were ob served, along with a wave which may be linked to the reduction of the "acidic" proton. | | | |
Reference
| Z. Naturforsch. 48b, 1360—1364 (1993); received May 17 1993 | | | |
Published
| 1993 | | | |
Keywords
| X-Ray, Cobaloximatic Acid, Extended Hydrogen Bridging, Cyclic Voltammetry | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/48/ZNB-1993-48b-1360.pdf | | | | Identifier
| ZNB-1993-48b-1360 | | | | Volume
| 48 | |
|
