SYNTHESIS OF METHYLTRIOXORHENIUM(VII) ARYLAMINE COMPLEXES AND MONO(ORTHO)-CHELATED AND BIS(ORTHO)-CHELATED ARYLAMINORHENIUM(VII) TRIOXIDES

From the reaction of MeReO3 with the neutral arylamine C6H5CH2NMe2 and the aryldiamine C6H4(CH2NMe2)(2)-1,3, have been isolated in good yiel ds the 1/1 adduct complex [MeReO3 . C6H5CH2NMe2], 1, and the 2/1 adduc t complex [(MeReO3)(2) . C6H4(CH2NMe2)(2)-1,3], 2, respectively. The X -ray molecular structure of 2 shows that both rhenium centres have a t rigonal bipyramidal geometry and in the axial positions of each rheniu m centre are one of the NMe2 units of the aryldiamine ligand and a met hyl group. The mono(ortho)-chelated arylaminorhenium trioxide complex [ReO3{C6H4CH2NMe2-2}], 3, can be synthesized by a transmetallation rea ction of CIReO3 with [Zn{C6H4CH2NMe2-2}(2)] in a 2:1 molar ratio. in a similar way the bis(ortho)-chelated arylaminorhenium trioxide complex [ReO3{C6H3(CH2NMe2)(2)-2,6}], 4, can be synthesized by addition of a mixture of [Li-2{C6H3(CH2NMe2)(2)-2,6}(2)] and complex 4 has a bicappe d tetrahedral geometry in which the monoanionic {C6H3(CH2NMe2)(2)-2,6} (-) ligand is pseudo-facially bonded with a characteristic N1-Re-N2 an gle of 107.7(3)degrees, a Re-C-ipso bond length of 2.112(11)Angstrom a nd Re-N1 and Re-N2 bond lengths of 2.518(9)Angstrom and 2.480(8)Angstr om respectively.