1. Department of Physical and Applied Sciences , University of Houston – Clear Lake , 2700 Bay Area Boulevard , Houston, TX 77058 , USA
2. Department of Chemistry , New Mexico Highlands University , P.O. Box 9000 , Las Vegas, NM 87701 , USA
3. Department of Chemistry , Marquette University , P.O. Box 1881 , Milwaukee, WI 53201 , USA