A chemical molecule known as a sandwich has a metal attached to two arene (ring) ligands by haptic, covalent connections. The formula for arenes is CnHn, and their derivatives can be either substituted or heterocyclic. It is referred regarded as being "sandwiched" because the metal is often positioned in between the two rings. The metallocenes are a distinct class of sandwich complexes. When ferrocene's structure was verified by X-ray crystallography in a study by J. D. Dunitz, L. E. Orgel, and R. A. Rich in 1956, they coined the phrase "sandwich compound" to describe it. It had been suggested some years prior by Robert Burns Woodward and, separately, by Ernst Otto Fischer that the molecule would include an iron atom wedged between two parallel cyclopentadienyl rings.
Stanislaw Dzwigaj
Sorbonne University, France
Anne M Gaffney
University of South Carolina, United States
Marta I Litter
Sapienza University of Rome, Italy
Dai Yeun Jeong
Jeju National University, Korea, Republic of
Sergey Suchkov
R&D Director of the National Center for Human Photosynthesis, Mexico
Vladislav Sadykov
Novosibirsk State University, Russian Federation
Enrico Paris
CREA-IT & DIAEE, Italy
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Dai Yeun Jeong, Jeju National University, Korea, Republic of
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Vladislav Sadykov, Novosibirsk State University, Russian Federation
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Nora Elouhabi, Ibn Tofail University, Morocco
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Rawia Nasri, University of Tunis El Manar, Tunisia
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