Spin solitons in a halogen-bridged 1-D Pt complex

Abstract

Temperature and Larmor frequency dependences of 1H NMR relaxation time T 1 were measured in a 1-D halogen-bridged complex [Pt(en) 2][PtX 2(en) 2](ClO 4) 4 in ranges of 90 – 300 K and 15 – 60 MHz, respectively. The observed main and long T 1 component was explainable by the magnetic dipolar relaxation due to electron spins diffusing along the 1-D chain containing paramagnetic Pt III sites with a concentration of 10 −4 in molar ratio. These spins attributed to neutral spin solitons were shown to diffuse more rapidly than those in [Pd(chxn) 2][PdBr 2(chxn) 2]Br 4 forming 2-D H-bond networks