Complexes with the general formula [MII(NCCH3)6][TPFB]2 [M = Cr, Fe, Co, Ni, Cu, Zn, (TPFB)– = tetrakis(pentafluorophenyl)borate] were synthesized and characterized both in the solid state and in solution. According to the spectroscopic data, [TPFB] can be considered as a truly ...