1. Inorganic Chemistry, Bergische University of Wuppertal, Gauss Str. 20, D-42119 Wuppertal, Germany
2. Romanian Academy, Institute of Organic Chemistry “C. D. Nenitzescu”, Spl. Independentei 202B, 77141 Bucharest Romania
3. Merck KGaA, PM-ABE, Frankfurter Str. 250, D-64293 Darmstadt, Germany