1. Inorganic and Physical Chemistry Division; Faculty of Mathematics and Natural Sciences; Institut Teknologi Bandung; Jalan Ganesha 10 Bandung 40132 Indonesia
2. Physical Chemistry Division; Faculty of Mathematics and Natural Sciences; Sam Ratulangi University; Jalan Kampus UNSRAT Kleak; Manado 95115 Indonesia
3. Organic Chemistry Division; Faculty of Mathematics and Natural Sciences; Institut Teknologi Bandung; Jalan Ganesha 10 Bandung 40132 Indonesia