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We present a detailed analysis of the results of our numerical study of thecrystal and electronic structure of the room temperature organometallicferrimagnet of general composition V(TCNE)$_{x}$ with $% x\approx 2$. Theresults of the LSDA+$U$ study show that the experimentally determined structurecomplies with the magnetic measurements and thus can serve as a prototypestructure for the entire family of the M(TCNE)$_{2}$ organometallic magnets.The results of the numerical study and of the magnetic experiments areinterpreted using model Hamiltonians proposed here. This allowed us to obtainestimates of the critical temperature in three- and two-dimensional regimes andto give an explanation of the differences in behavior of probably isostructuralV(TCNE)$_{2}$ and Fe(TCNE)$_{2}$ species.

Crystal and electronic structure of the room temperature organometallic  ferrimagnet V(TCNE)$_2$. Analysis of numerical DoS and magnetic properties as  related to orbital and spin-Hamiltonian models