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First principle FLAPW-GGA calculations have been performed with the purposeto understand the electronic properties for the newly synthesized tetragonal(space group P4/nmm) layered iron arsenide-oxide: Sr4Sc2Fe2As2O6 doped withtitanium. The total and partial densities of states, low-temperature electronspecific heat and molar Pauli paramagnetic susceptibility have been obtainedand discussed for Sr4ScTiFe2As2O6 in comparison with parent phaseSr4Sc2Fe2As2O6.  Our results show that the insertion of Ti into Sc sublattice of ironarsenide-oxide phase Sr4Sc2Fe2As2O6 leads to principal change of its electronicstructure; in result the insulating so-called "charge reservoirs', i.e.perovskite-based [Sr4Sc2O6] blocks became conducting. This situation differsessentially from the known picture for all others Fe-As superconductors wherethe conducting [Fe2As2] blocks are separated by isolating blocks.

Electronic structure of Ti-doped Sr4Sc2Fe2As2O6