1. Department of Chemistry, University of Nevada Las Vegas, 4505 Maryland Parkway, Box 454003, Las Vegas, Nevada 89154-4003, Department of Chemistry, Chonnam National University, 300, Yongbong-dong, Buk-gu, Gwangju 500-757, South Korea, and School of Display and Chemical Technology, Yeungnam University, 214-1 Daedong, Gyeongsan, Gyeongbook 712-749, South Korea