η2-Coordination of a Sn-H Bond to a Transition Metal. Molecular Structure of (η5-MeC5H4)(CO)2Mn(H)SnPh3

Article abstract of DOI:10.1021/ja00189a032

(η⁵-MeC5H4)(CO)2Mn(H)SnPh3 (1) has been prepared by photochemical reaction between MeCpMn(CO)3 and HSnPh3 and thermally reacts with an excess of HSnPh3 to give trans-MeCp(CO)2Mn(SnPh3)2 (2).Complex 1 crystallizes in the triclinic space group P1<*> with a = 8.262 (3) Angstroem, b = 10.536 (4) Angstroem, c = 14.755 (6) Angstroem, α = 94.63 (3) deg, β = 99.95 (3) deg, γ = 110.58 (3) deg (Z = 2).The rather high NMR coupling constants J(¹¹⁹SnMnH) = 270 Hz and J(¹¹⁷SnMnH) = 252 Hz of 1 and the structural data, particularly the geometry of the MeCp(CO)2Mn fragment and the Mn-Sn (2.636 (1) Angstroem), Mn-H (1.37 (4) Angstroem) and Sn-H distance (2.16 (4) Angstroem), show that the stannane is bondet to the metal by a Mn, H, Sn three-center bond.Sn-H interaction in 1 is weaker than Si-H interaction in corresponding silyl complexes, Cp(CO)2Mn(H)SiR3, which contain η²-coordinated Si-H bonds