Complexes of Ambidentate N,O-Donor Ligands with Rhenium(I) and -(V) |
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| Authors: | Annemè Boyce Thomas I A Gerber Eric C Hosten |
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| Institution: | 1.Department of Chemistry,Nelson Mandela Metropolitan University,Port Elizabeth,South Africa |
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| Abstract: | The reaction of the potentially bidentate ambidentate N,O-donor ligands 3-hydroxy-2-pyridinecarboxylic acid (Hhpc) and 3-hydroxy-2-(hydroxymethyl)pyridine (Hhhp) with trans-ReOCl3(PPh3)2] led to the isolation of the products ReOCl(hpc)2] (1) (from acetonitrile) and ReOCl2(hhp)(PPh3)] (2) (from ethanol) respectively. In both complexes hpc and hhp are coordinated as bidentate N,O-donor chelates, rather than as O,O-donor ligands. From the reaction of Re(CO)5Cl] and Hhhp·HCl in ethanol the neutral complex fac-Re(CO)3Cl(Hhhp)] (3) was obtained, with N,O-coordination of Hhhp. Complex 1 crystallizes in the monoclinic space group P21/n with a?=?6.8782(3), b?=?20.0647(8), c?=?10.8692(4) Å, β?=?107.545(1)°, and Z?=?4. Complex 2 crystallizes in the triclinic space group P-1 with a?=?7.3523(4), b?=?8.1047(5), c?=?19.591(1) Å, α?=?91.133(2)°, β?=?93.656(2)°, γ?=?93.074(2)° and Z?=?2. Complex 3 has monoclinic P21/c symmetry with the cell parameters a?=?10.6452(5), b?=?11.1372(5), c?=?9.7229(5) Å, β?=?106.107(2)°, and Z?=?4.Graphical AbstractThe reaction of the potentially bidentate ambidentate N,O-donor ligands 3-hydroxy-2-pyridinecarboxylic acid (Hhpc) and 3-hydroxy-2-(hydroxymethyl)pyridine (Hhhp) with trans-ReOCl 3(PPh 3) 2] led to the isolation of the products ReOCl(hpc) 2] (from acetonitrile) and ReOCl 2(hhp)(PPh 3)] (from ethanol) respectively. In both complexes hpc and hhp are coordinated as bidentate N,O-donor chelates, rather than as O,O-donor ligands. From the reaction of Re(CO) 5Cl] and Hhhp·HCl in ethanol the neutral complex fac-Re(CO) 3Cl(Hhhp)] was obtained, with N,O-coordination of Hhhp. Spectroscopic data and the X-ray crystal structures of the complexes are reported. | |
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