Jisho

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化合物
Wikipedia definition
1. Sandwich compoundIn organometallic chemistry, a sandwich compound is a chemical compound featuring a metal bound by haptic covalent bonds to two arene ligands. The arenes have the formula CnHn, substituted derivatives (for example Cnn) and heterocyclic derivatives (for example BCnHn+1). Because the metal is usually situated between the two rings, it is said to be "sandwiched. " A special class of sandwich complexes are the metallocenes.
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