1. V. I. Pavlovski, U. Leibnitz, and P. Thomas,Z. Chem.,30, No. 2, 73 (1990).
2. XP. Interactive Molecular Graphics Program, Version 5.03, Siemens Analytical X-Ray Instrumentation Inc., Madison, WI (1994).
3. G. M. Sheldrick,Program for the Refinement of Crystal Structures, University of Göttingen (1993).
4. G. M. Sheldrick,SHELXTL, Version 5.0, Reference Manual, Siemens Analytical X-Ray Instrumentation Inc., Madison, WI (1994).
5. L. G. Marzilli and D. A. Buckingham,Inorg. Chem.,6, No. 5, 1042–1052 (1967).