1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Xindu, P. R. China
2. School of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, P. R. China
3. Department of Chemistry, Thiruvalluvar University, Vellore, Tamil Nadu, India
4. Department of Chemistry, School of Advanced Sciences, VIT University, Vellore, Tamil Nadu, India