MULTIPLE BONDS BETWEEN TRANSITION-METALS AND MAIN-GROUP ELEMENTS .142. LEWIS-BASE ADDUCTS OF ORGANORHENIUM(VII) OXIDES - STRUCTURES AND DYNAMIC BEHAVIOR IN SOLUTION

Organorhenium(VII) oxides such as methyltrioxorhenium(VII) (1) and its longer-chain alkyl derivatives form 1:1 and 1:2 adducts with nitrogen -donor Lewis bases. These compounds adopt well-defined structures in t he solid state. In solution, they undergo exchange of both the metal-c oordinated base ligands and the oxo ligands. The synthesis and crystal structure (X-ray diffraction study) of the amino-functionalized compl ex O3Re-CH2CH2CH2N(C5H10) (3a) is reported. Crystal data are as follow s: monoclinic, space group P2(1)/c, a = 8.327(2) Angstrom, b = 11.516( 1) Angstrom, c = 10.864(2) Angstrom, beta = 101.54(7)degrees R = 0.028 for 1747 reflections. Compounds of type 3a are intramolecular base ad ducts in the solid state, but rigid geometries in solution can only be observed at low temperatures.