| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1340367 | Polyhedron | 2008 | 7 Pages |
Novel rhenium complexes containing the maltolate (mal) or kojate (koj) anions as chelating ligands have been synthesized: [ReOCl(mal)2] (1), [ReOCl2(mal)(PPh3)] (2), [ReOBr2(mal)(PPh3)] (3), [ReOCl2(koj)(PPh3)] (4) and [ReOBr2(koj)(PPh3)] (5). The products have been characterized by FTIR, 1H, 13C, and 31P NMR spectroscopies and elemental analysis. The crystal and molecular structures of all complexes were determined. Complex 1 crystallizes monoclinic, space group C2/c, Z = 8. It contains two O,O′-bidentate maltolate ligands and one chloro ligand at the (ReO)3+ unit, so that a distorted octahedral geometry is adopted by the six-coordinated rhenium(V) center. The chloro ligand occupies a cis position to the oxo ligand. Complexes 2 and 3 are isostructural and crystallize orthorhombic, space group Pbca and Z = 8. The isostructural complexes 4 and 5 crystallize monoclinic, space group P21/n and Z = 4. In complexes 2–5, the (ReO)3+ unit is coordinated by a monoanionic O,O-bidentate unit of the maltolate (2 and 3) or kojate (4 and 5) ligand, one triphenylphosphine and two halogeno ligands (Cl in 2 and 4; Br in 3 and 5), with the rhenium(V) center in a distorted octahedral environment. The halide ligands are in cis positions to each other.
Graphical abstractA series of rhenium(V) complexes containing maltolate (mal) or kojate (koj) as ligand have been synthesized. The compounds [ReOCl(mal)2], [ReOCl2(mal)(PPh3)], [ReOBr2(mal)(PPh3)], [ReOCl2(koj)(PPh3)] and [ReOBr2(koj)(PPh3)] were characterized by elemental analyses, IR, multinuclear NMR (1H, 13C and 31P) and single crystal X-ray diffraction studies.Figure optionsDownload full-size imageDownload as PowerPoint slide
