1. Center for Integrative Petroleum Research, College of Petroleum Engineering & Geosciences, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
2. Department of Chemistry, University of Houston, Houston, Texas 77204-5003, United States
3. Mary and Charles Ferkel Professor of Chemistry, California Institute of Technology, Noyes Lab Chem Phys, Pasadena, California 91125, United States