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Metallocene
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===Multi-decker sandwich compounds=== [[File:Ni-triple-sandwich.png|thumb|150px|Nickel triple-decker sandwich complex]] Triple-decker complexes are composed of three Cp anions and two metal cations in alternating order. The first triple-decker sandwich complex, {{chem2|[Ni2Cp3](+)}}, was reported in 1972.<ref>{{cite journal|last1=Werner|first1=Helmut|last2=Salzer|first2=Albrecht|date=1972-01-01|title=Die Synthese Eines Ersten Doppel-Sandwich-Komplexes: Das Dinickeltricyclopentadienyl-Kation|journal=Synthesis and Reactivity in Inorganic and Metal-Organic Chemistry|volume=2|issue=3|pages=239β248|doi=10.1080/00945717208069606|issn=0094-5714}}</ref> Many examples have been reported subsequently, often with [[carborane|boron-containing rings]].<ref>{{cite journal|first= R. N.|last= Grimes|title= Boron clusters come of age|journal= [[J. Chem. Educ.]]|year= 2004|volume= 81|pages= 657β672|doi=10.1021/ed081p657|issue= 5|bibcode= 2004JChEd..81..657G|doi-access= free}}</ref>
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