1. Department of Chemistry, Graduate School of Science and Engineering, Saitama University, Shimo-okubo, Sakura-ku, Saitama-city, Saitama 338-8570, Japan.
2. Babes-Bolyai University, 1, Kogalniceanu Street, Cluj-Napoca, Romania.
3. High Resolution NMR Centre, Department of Materials and Chemistry, Vrije Universiteit Brussel, Pleinlaan 2 B-1050, Brussels, Belgium.
4. Department of Chemistry, College of Science, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan.