XPS and UV/Vis MCD studies of M[TCNE] organic-based magnets

M[TCNE] (M = V, Fe, Mn, Ni; TCNE = tetracyanoethylene) organic-based magnets provide a systematic means of studying magnetic superexchange by varying the 3d t$_{2g}$ and e$_{g}$ filling. X-ray photoemission binding energy spectra of core electrons C (1s), N (1s) and M (3p) were used to study valency and bond type, giving a correlation between binding energy and transition temperature. UV/Vis Magnetic Circular Dischroism studies were conducted to investigate lowest unoccupied state and onsite Coulomb repulsion for both M 3d and TCNE $\pi $*. This talk will focus on providing empirical evidence of the near Fermi edge spin polarized electron structure in the context of magnetic exchange