Osmocene

• Bis ( η5 - cyclopentadienyl) osmium
• Di ( cyclopentadienyl) osmium
• (Cp ) 2os

White crystalline solid

Fixed

226-228 ° C

Soluble in diethyl ether

Attention

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Osmocene, or di ( cyclopentadienyl) osmium, Os ( C5H5) 2, abbreviated OsCp2, is an organometallic compound selected from the family of metallocenes. It is isoelectronic with ferrocene and ruthenocene and how these forms also a sandwich complex. In contrast to ferrocene and ruthenocene, which are well-studied compounds is osmocene, because of the price, the low availability and toxicity of osmium, far less well known.

Production

Osmocene was first synthesized by Ernst Otto Fischer and Heinrich Grumbert. It can be prepared, inter alia, by the reaction of osmium tetroxide with hydrogen bromide, followed by reaction with zinc and cyclopentadiene.

Properties

Osmocene is a white solid which is commercially available. Like the isoelectronic compounds ferrocene and ruthenocene from the same group, osmocene forms an eclipsed structure with an Os -C bond length of 222 pm. Osmocene is compared to ferrocene and ruthenocene less reactive towards electrophilic aromatic substitution, but shows the greatest tendency to form adducts with Lewis acids. The Osmoceniumkation [ OsCp2 ] dimerizes to form an Os -Os - Os -Os bond with a distance of 304 pm. In contrast, the Osmoceniumkation the pentamethylcyclopentadienyl [ OSCP * 2] as the monomer is stable.

Use

2009 reported Horst Kunkely and Arnd Vogler about the possibility of photolytic water splitting using osmocene as a catalyst.