Synthesis of methyltrioxorhenium(VII) arylamine complexes and mono- and bis(ortho)-chelated arylaminorhenium(VII) trioxides |
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Authors: | Marco HP Rietveld Lammert Nagelholt David M Grove Nora Veldman Anthony L Spek Monika U Rauch Wolfgang A Herrmann and Gerard van Koten |
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Institution: | aDebye Institute, Department of Metal-Mediated Synthesis, Utrecht University, Padualaan 8, 3584 CH Utrecht, Netherlands bBijvoet Center for Biomolecular Research, Department of Crystal and Structural Chemistry, Utrecht University, Padualaan 8, 3584 CH Utrecht, Netherlands cAnorganisch-chemisches Institut der Technischen Universität München, Lichtenbergstraβe 4, D-85747 Garching, Germany |
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Abstract: | From the reaction of MeReO3 with the neutral arylamine C6H5CH2NMe2 and the aryldiamine C6H4(CH2NMe2)2?1,3, have been isolated in good yields the 1/1 adduct complex MeReO3 · C6H5CH2NMe2], 1, and the 2/1 adduct complex (MeReO3)2 · C6H4(CH2NMe2)2? 1,3], 2, respectively. The X-ray molecular structure of 2 shows that both rhenium centres have a trigonal bipyramidal geometry and in the axial positions of each rhenium centre are one of the NMe2 units of the aryldiamine ligand and a methyl group. The mono(ortho)-chelated arylaminorhenium trioxide complex ReO3(C6H4CH2NMe2?2], 3, can be synthesized by a transmetallation reaction of ClReO3 with ZnC6H4CH2NMe2?22] in a 2:1 molar ratio. In a similar way the bis(ortho)-chelated arylaminorhenium trioxide complex ReO3C6H3(CH2NMe2)2?2,6], 4, can be synthesized by addition of a mixture of Li2C6H3(CH2NMe2)2?2,62] and ZnCl2 to ClReO3. Complexes 3 and 4 have been isolated as white solids in 66% and 81% yields respectively. The rhenium centre in complex 4 has a bicapped tetrahedral geometry in which the monoanionic C6H3(CH2NMe2)2?2,6? ligand is pseudo-facially bonded with a characteristic N1-Re-N2 angle of 107.7(3)°, a Re-Cipso bond length of 2.112(11) A? and Re-N1 and Re-N2 bond lengths of 2.518(9) A? and 2.480(8) A? respectively. |
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Keywords: | Rhenium Oxide Arylamine Crystal structure Chelate Bridging ligand |
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