A 1H NMR Study on the Electronic State of a Chloride-bridged Tetrakis(acetamidato) dirhodium Complex

A temperature dependence of 1H NMR spin-lattice relaxation time in a zig-zag chain of chloride-bridged tetrakis(acetamidato) dirhodium was measured. The observed 1H relaxation was well explained by the fluctuation of the magnetic dipolar interaction between proton and paramagnetic electron spins, where each unpaired spin is coupled by the one-dimensional antiferromagnetic interaction above 35 K. The slight change of the electronic state in the Rh dimer was observed below 35 K.