1. Department of Chemistry, College of Science King Saud University, P.O. Box 2455 Riyadh 11451 Kingdom of Saudi Arabia
2. Chemistry Department King Fahd University of Petroleum & Materials Dhahran 31261 Kingdom of Saudi Arabia
3. Department of Chemistry Johannes Gutenberg-University of Mainz Duesbergweg 10–14 D-55128 Mainz Germany
4. Interdisciplinary Research Center for Hydrogen and Energy Storage (IRC-HES) King Fahd University of Petroleum and & Minerals Dhahran 31261 Saudi Arabia