1. G. W. A. Fowles, D. A. Rice, and K. J. Shanton, J. Chem. Soc. Dalton Trans., 1212 (1977).
2. M. G. B. Drew, K. S. Moss, and N. Rolfe, Inorg. Nucl. Chem. Lett. 7(12), 1219 (1971).
3. SMART (Control) and SAINT (Integration) Software, Version 5.0 (Bruker AXS, Madison, WI, 1997).
4. G. M. Sheldrick, SADABS: Program for Scaling and Correction of Area Detector Data (Univ. of Gö ttingen, Germany, 1997).
5. G. M. Sheldrick, SHELXS97: Program for the Solution of Crystal Structures (Univ. of Göttingen, Germany, 1997).