抄録
Homoionic (MB) and MB-Na-montmorillonites were prepared and examined by IR, ESR and X-ray methods. The IR spectrum of MB on montmorillonite was very similar to that of MB in methanol and was considered to be a typical spectrum for MB in monomer form. Protonation of MB+ to MB++ on the clay surface was observed in homoionic MBmontmorillonite, which showed a deformation band of hydrogen on the group=N-at 1520 cm-1. Aqueous and solid MB (polymer forms) showed ESR signal at g=2.0036. This signal can be ascribed to free radicals occurring within the structure of the associated molecules. MB in methanol or on the exchange sites did not show any ESR signal, confirming the IR finding that MB in methanol or adsorbed on the clay surface is mainly in the pure monomer form. The ESR signal of the clay at g-2 was not affected either by methanol wash or MB+ on the exchange sites showing that the presence of MB+ had no effect on the paramagnetic species on the clay. X-ray spacing of MB-complexes showed both single and two-layer structures.
