  The problem of adequate electronic model for doped manganites like
La_{1-x}Sr_{x}MnO_3 remains controversial. In such a situation we argue a
necessity to discuss all possible candidate states with different valent
structure of manganese and oxygen atoms, as well as different valent states of
octahedral MnO_{6} centers. In frames of quantum-chemical approach, crystal
field and the ligand field models we address different types of MnO_6 centers,
different types of d-d, and charge transfer transitions. We draw special
attention to the so-called charge transfer states related to strong
intra-center charge fluctuations. As we conjecture, namely these could become
active valent states for doped manganites. We discuss some electric and
magnetic properties of the electron MnO_{6}^{10-}, and hole MnO_{6}^{8-}
centers with unconventional ^{6}A_{1g}-{}^{6}T_{1u} and ^{4}A_{2g}-{}^{4}T_{2u}
valent manifolds, respectively. We propose two idealized theoretical models for
hole system in doped manganites with an overall oxygen localization for the
doped holes occupying the non-bonding O2p orbitals, and a doping induced
formation of a system of the electron MnO_{6}^{10-} and hole MnO_{6}^{8-}
centers being equivalent to the electron-hole Bose liquid.
