Manganese compounds MnIV

Whilst electronic spectra do not have the structural use they have (with discretion) with nickel(II), it is at least possible to make some useful deduction from the colour of the products. We can, for example, conclude with some confidence that a black substance described as a manganese(II) compound with oxygen donors was not that a white substance described as MnIV or Mnv was not and that a green compound, having the same intense colour as some related Mn111 species, was probably not manganese(II), despite the apparent stoichiometry (Section 41.3.3.2). Yet each of these has appeared in the recent literature. 

---