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Complexes of Ambidentate N,O-Donor Ligands with Rhenium(I) and -(V)

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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 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] (from acetonitrile) and [ReOCl2(hhp)(PPh3)] (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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Funding

The funding was provided by Nelson Mandela Metropolitan University.

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Authors and Affiliations

  1. Department of Chemistry, Nelson Mandela Metropolitan University, Port Elizabeth, 6031, South Africa

    Annemè Boyce, Thomas I. A. Gerber & Eric C. Hosten

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  1. Annemè Boyce
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  2. Thomas I. A. Gerber
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  3. Eric C. Hosten
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Correspondence to Thomas I. A. Gerber.

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Boyce, A., Gerber, T.I.A. & Hosten, E.C. Complexes of Ambidentate N,O-Donor Ligands with Rhenium(I) and -(V). J Chem Crystallogr 48, 96–102 (2018). https://doi.org/10.1007/s10870-018-0715-5

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  • DOI: https://doi.org/10.1007/s10870-018-0715-5

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