1. C.N.R.S., Institut Charles Sadron, 23 rue du Loess, F-67034 Strasbourg, France
2. Department of Chemistry, Quaid-i-Azam University, Islamabad - 45320, Pakistan
3. Université de Strasbourg, Faculté de Chimie, 1 rue Blaise Pascal, F-67008 Strasbourg, France
4. International Center for Frontier Research in Chemistry, 8 allée Gaspard Monge, F-67083 Strasbourg, France