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Complexes of [Re(CO)3Cl] with different oxidation states of the polyfunctional bmtz/H2bmtz ligand system (bmtz=3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine) |
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| Authors: | Sté phanie Frantz,Jan Fiedler |
| Affiliation: | a Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany b J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejškova 3, CZ-18223 Prague, Czech Republic c Grenoble High Magnetic Field Laboratory, MPI-CNRS, 25, Avenue des Martyrs, BP 166, F-38042, Grenoble Cedex 9, France |
| Abstract: | Combining fac-[Re(CO)3Cl] with components of the ligand redox system bmtz/bmtz −/H2bmtz/H2bmtz− (bmtz=3,6-bis(2-pyrimidyl)-1,2,4,5-tetrazine) has led to the isolation of the complexes (H2bmtz)Re(CO)3Cl, (μ-H2bmtz)[Re(CO)3Cl]2 and (μ-bmtz)[Re(CO)3Cl]2. Other species characterized were (bmtz)Re(CO)3Cl (UV/Vis, IR), [(H2bmtz)Re(CO)3Cl]− (UV/Vis, IR, EPR), {(μ-H2bmtz)[Re(CO)3Cl]2}− (UV/Vis, IR, EPR) and {(μ-bmtz)[Re(CO)3Cl]2}− (UV/Vis, IR, X band and high-field EPR). The results confirm bmtz as very strong and H2bmtz as moderate π acceptor ligand versus one or two chelate-bonded low-valent metal centers. Reactivity is observed in terms of oxidative proton and reductive chloride dissociation. |
| Keywords: | Cyclic voltammetry EPR Rhenium complexes Spectroelectrochemistry Tetrazine ligands |
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