13C NMR Spectra, 1H NMR Relaxation and ESR Measurements of Br2 Doped {[Pt(en) 2][PtBr2(en) 2]}3(CuBr4)4·12H2O

We measured NMR and ESR in solid state of a Br 2 doped halogen-bridged one-dimensional mixed-valence complex, {[Pt(en) 2 ][PtBr 2 (en) 2 ]} 3 (CuBr 4 ) 4 .12H 2 O, which forms a double chain structure consisting of -Pt(II)-Br-Pt(IV)-Br- and -Cu(I)-Br-Cu(I)-Br-, 13 C NMR measurements gave broad spectra explainable by marked effects from paramagnetic sites assignable to Pt(III) and/ or Cu(II) in the chain oxidized by bromine. Pt(III) sites are considered to form neutral solitons by referring to the electrical conductivity result.