1. School of Chemistry and Chemical Engineering Guangdong Pharmaceutical University Zhongshan, Guangdong 528458 P. R. China
2. Hunan Provincial Key Laboratory of Xiangnan Rare-Precious Metals Compounds Research and Application School of Chemistry and Environmental Science Xiangnan University Chenzhou Hunan Province 423000 P. R. China
3. Department of Chemistry Rutgers University 73 Warren Street Newark NJ 07102 USA
4. Department of Chemistry Wroclaw University F. Joliot-Curie 14 Wroclaw 50-383 Poland