It was first reported in 1931.[2] Of the several ways to produce this compound,[3] is the protonation of the pentacarbonyl manganate anion. The latter is formed from reduction ofdimanganese decacarbonyl, e.g., withsuperhydride:
The structure of HMn(CO)5 has been studied by many methods includingX-ray diffraction,neutron diffraction, andelectron diffraction.[5] HMn(CO)5 can be related to the structure of a hexacarbonyl complex such asMn(CO)+ 6, and therefore has similar properties.[6] The compound has octahedral symmetry,[7] itsmolecular point group is C4v and the H-Mnbond length is 1.44 ± 0.03 Å.[6] Gas phase electron diffraction analysis confirms these conclusions.
A common reaction involving HMn(CO)5 is substitution of the CO ligands byorganophosphines, as occurs both thermally and photochemically. In this way the many derivatives form of the type HMn(CO)5-x(PR3)x.[9] (R here need not be a purelyhydrocarbon component; it may, for instance, be OEt, where Et =ethyl group.)
^abcHunter, Alan D; Bianconi, Larry J; DiMuzio, Steven J; Braho, Dianne L. Synthesis and Structure- Property Relationships in η6-Arene) Cr(CO)3 Chemistry: From Guided Experiments to Discovery Research.J. Chem. Educ. 75. 1998. 891.doi:10.1021/ed075p891
^Finn, M.G. Pentacarbonyl(trimethylsilyl)manganese.Encyclopedia of Reagents for Organic Synthesis.doi:10.1002/047084289X.rp022s
5-2D.png)
