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Biferrocene and ferrocenylruthenocene react with HgCl2 to give very stable adducts. Large quadrupole splitting values (2.93 mm s−1 for biferrocene–2HgCl2 and 2.99 mm s−1 for ferrocenylruthenocene–5HgCl2, both at 78 K) indicate the presence of a direct interaction between the Fe and Hg atoms. The stabilities of their adducts suggest a chelating effect between the Fe and Fe or Fe and Ru atoms in biferrocene or ferrocenylruthenocene, respectively.
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Watanabe et al. (1986) studied this question.
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