The preparation and crystal structures of a covalent tetrafluoroborato complex, (CO)3(dppfe)MnFBF3, and of a related ionic complex, [(CO)4(dppfe)Mn]BF4 [(dppfe) = bis-(1,1′-diphenylphosphino)ferrocene]

The titled covalent tetrafluoroborato dppfe complex was prepared by treating the precursor hydride, (CO)3(dppfe)MnH, with tetrafluoroboric acid. Similar treatment of analogous hydrido complexes with other chelating phosphines always gave ionic tetrafluoroborates, presumably via similar intermediate FBF3 covalent complexes, which however could not be isolated. Crystal structures for the covalent complex (CO)3(dppfe)MnFBF3.3/2CH2Cl2, 3, and the ionic complex [(CO)4(dppfe)Mn]BF4.CH2Cl2, 4, were determined. Crystal data for 3, monoclinic crystal system, space group = P21/n, a = 11.458(2) A, b = 19.348(3) A, c = 17.810(3) A, β = 104.410(4)∘, V = 3823.9(12) A3, Z = 4; for 4, monoclinic crystal system, space group = P21/n, a = 15.6521(2) A, b = 14.3107(4) A, c = 17.0933(5) A, β = 95.075(1)∘, V = 3813.8(2) A3, Z = 4.