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We calculate the strength of the frequency-dependent on-site electronicinteractions in the iron pnictides LaFeAsO, BaFe2As2, BaRu2As2, and LiFeAs andthe chalcogenide FeSe from first principles within the constrained random phaseapproximation. We discuss the accuracy of an atomic-like parametrization of thetwo-index density-density interaction matrices based on the calculation of anoptimal set of three independent Slater integrals, assuming that the angularpart of the Fe-d localized orbitals can be described within spherical harmonicsas for isolated Fe atoms. We show that its quality depends on the ligand-metalbonding character rather than on the dimensionality of the lattice: it isexcellent for ionic-like Fe-Se (FeSe) chalcogenides and a more severeapproximation for more covalent Fe-As (LaFeAsO, BaFe2As2) pnictides. Wefurthermore analyze the relative importance of different screening channels,with similar conclusions for the different pnictides but a somewhat differentpicture for the benchmark oxide SrVO3: the ligand channel does not appear to bedominant in the pnictides, while oxygen screening is the most important processin the oxide. Finally, we analyze the frequency dependence of the interaction.In contrast to simple oxides, in iron pnictides its functional form cannot besimply modeled by a single plasmon, and the actual density of modes enters theconstruction of an effective Hamiltonian determining the low-energy properties.

Hubbard interactions in iron-based pnictides and chalcogenides: Slater parametrization, screening channels and frequency dependence