Madhu, V. ; Das, Samar K. (2004) Near-IR absorption due to supramolecular electronic interaction in an extended 3D hydrogen-bonding network material: synthesis, crystal structure and properties of [4,4'-H2bpy][Cu(mnt)2] Polyhedron, 23 (7). pp. 1235-1242. ISSN 0277-5387
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Official URL: http://www.sciencedirect.com/science/article/pii/S...
Related URL: http://dx.doi.org/10.1016/j.poly.2004.02.002
Abstract
The synthesis and single-crystal X-ray structure of an ion-pair complex, [4,4'-H2bpy][Cu(mnt)2] (1), is described. In the crystal structure, the interactions between anions and cations via bifurcated (bpyN)-H···(NC-mnt)2 hydrogen bonds give rise to a three-dimensional supramolecular network having well-defined channels. Complex 1 exhibits two redox waves at +0.44 and -0.36 V (versus SCE) in dimethylformamide corresponding to the Cu(mnt)2]1-/Cu(mnt)2]2- and [4,4'-H2bpy]2+/[4,4'-H2bpy]1+ couples, respectively. The near-IR absorption at 1225 nm in the solid state has been attributed to the charge transfer from the copper dithiolate anion, [Cu(mnt)2]2-, to the bipyridinium cation, [4,4'-H2bpy]2+. Reaction of [Bu4N]2[Cu(mnt)2] with [4,4'-H2bpy]Cl2 affords ion-pair complex [4,4'-H2bpy][Cu(mnt)2] showing three-dimensional supramolecular network in the solid state; the relevant interaction involves bifurcated (bpyN)-H···(NC-mnt) hydrogen bonds and the compound exhibits ion-pair charge transfer transition in the near-IR region.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Elsevier Science. |
| Keywords: | Ion Pair Complex; Hydrogen Bonding Network; Non-covalent Interaction; Charge Transfer; Near-IR Absorption |
| ID Code: | 63429 |
| Deposited On: | 29 Sep 2011 04:24 |
| Last Modified: | 29 Sep 2011 04:24 |
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