MX chains have been widely studied as a 1D mixed-valence system. Although there have been a large number of studies on the boundary between class II and III materials of the Robin-Day classification, there are few studies of compounds at the boundary between classes I and II. In this study, we synthesized a series of Pt- and Pd- MX-chain compounds with perrhenate counterions, [M(en)(2)][M(en)(2)X-2](ReO4)(4) (X = Br for M = Pd and X = Cl, Br, and I for M = Pt). All compounds were isostructural, and the metal-metal distances within the chain exceed 6 angstrom, which is the longest among MX-chain compounds thus far reported. For [Pt(en)(2)][Pt(en)(2)Cl-2](ReO4)(4) (PtCl), an intervalence charge transfer (IVCT) transition was observed in the UV region at 335 nm (3.7 eV), which is the shortest wavelength for the MX-chain compounds thus far reported, indicating that PtCl is the dosest to the Robin-Day class I limit.