Synthesis and structure of the first neutral octahedral cis-dioxorhenium(V) complex

摘要

The complex cis-[ReO_2(Hdab)(py)_2] (1) (H_2dab = 1,2-diaminobenzene) has been prepared by reacting trans-[ReO_2(py)_4]I with H_2dab in ethanol. This is the first example of a neutral hexacoordinate rhenium(V) complex with a cis arrangement of the two oxo groups. The compound also provides the first example of a bidentate monoanionic monoimino coordination mode of H_2dab. Crystal data for 1(centre dot)(H_3dab)I(centre dot)H_2O: C_(22)H_(26)IN_6O_2Re(centre dot)H_2O, triclinic, space group P1, a = 9.570(2), b = 12.493(3), c = 12.851(3) A, #alpha# = 61.60(3), #beta# = 70.56(3), #gamma# = 78.68(4) deg, V = 1273.1(4) A~3 and Z = 2.