1. A. L. Poznyak and V. E. Stel’mashok, Koord. Khim. 14, 482 (1988).
2. H. Kawaguchi, N. Maruyama, N. Ama, et al., Bull. Chem. Soc. Jpn. 65, 175 (1992).
3. G. M. Sheldrick, Acta Crystallogr., Sect. A: Found. Crystallogr. 46, 467 (1990).
4. G. M. Sheldrick, SHELXL93: Program for the Refinement of Crystal Structures (Univ. of Göttingen, Göttingen, 1993).
5. D. J. Robinson and C. H. L. Kennard, J. Chem. Soc., Dalton Trans., No. 7, 1008 (1970).