1. Chemistry Department King Fahd University of Petroleum & Minerals Dharan 31261 Kingdom of Saudi Arabia
2. Physics Department King Fahd University of Petroleum & Minerals Dharan 31261 Kingdom of Saudi Arabia
3. Center of Research Excellence in Nanotechnology King Fahd University of Petroleum & Minerals Dhahran 31262 Saudi Arabia
4. Center of Integrative Petroleum Research King Fahd University of Petroleum & Minerals Dhahran 31261 Saudi Arabia
5. Department of Chemistry College of Science King Saud University P.O. Box 2455 Riyadh 11451 Kingdom of Saudi Arabia
6. Institut für Anorganische Chemie und Analytische Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 55128 Mainz Germany