1. Institute
of Organoelement Compounds, Russian Academy of Sciences, 119991 Moscow, Russian Federation
2. Department of Natural Sciences, New Mexico Highlands University, Las Vegas, New Mexico 87701, United
States
3. Anorganisch-Chemisches Institut der Universität Heidelberg, 69120 Heidelberg, Germany
4. Dipartimento
di Chimica, Università di Siena, 53100 Siena, Italy