~(13)C NMR Spectra, ~1H NMR Relaxation and ESR Measurements of Br_2 Doped {[Pt(en)_2][PtBr_2(en)_2]}_3 (CuBr_4)_4 centre dot 12H_2O

摘要

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 centre dot 12H_2O, 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.