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Bidentate coordination is observed with the sulfur-bridged ferrocenophane 1: [Cu(CH3CN)4]BF4 and 1 react to form the salt [(1)2Cu]BF4. In the cation, the central copper atom is surrounded by a distorted tetrahedral arrangement of four sulfur atoms, each belonging to a different sulfur bridge.
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Ingham et al. (1994) studied this question.
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