An 1H NMR study on the motion of guanidinium cations in some crystals formed with tetrahedral or octahedral complex anions having halide ions as ligands.
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The temperature dependences of <SUP>1</SUP>H NMR spin-lattice relaxation times were determined at 20 MHz for [C(NH<SUB>2</SUB>)<SUB>3</SUB>]<SUB>2</SUB>ZnX<SUB>4</SUB> (X=Cl, Br), [C(NH<SUB>2</SUB>)<SUB>3</SUB>]<SUB>2</SUB>MCl<SUB>6</SUB> (M=Sn, Te, Pt), and [C(NH<SUB>2</SUB>)<SUB>3</SUB>]<SUB>2</SUB>PtBr<SUB>6</SUB>. Above room temperature, the <I>D</I><SUB>3h</SUB> cation undergoes reorientational motion by 120° about the cationic <I>C</I><SUB>3</SUB> axis. For [C(NH<SUB>2</SUB>)<SUB>3</SUB>]<SUB>2</SUB>TeCl<SUB>6</SUB> crystals, two phase transitions were located at 312 and 373 K.
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