Misplaced Pages

Dipotassium cyclooctatetraenide

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
Dipotassium cyclooctatetraenide
Names
Preferred IUPAC name Dipotassium cycloocatetraenediide
Identifiers
CAS Number
3D model (JSmol)
ChemSpider
PubChem CID
InChI
  • InChI=1S/C8H8.2K/c1-2-4-6-8-7-5-3-1;;/h1-8H;;/q-2;2*+1/b2-1-,5-3-,8-6-;;Key: JEUFATMWOKTCQC-YGFQESQOSA-N
  • InChI=1/C8H8.2K/c1-2-4-6-8-7-5-3-1;;/h1-8H;;/q-2;2*+1/b2-1-,5-3-,8-6-;;Key: JEUFATMWOKTCQC-YGFQESQOBL
SMILES
  • .c1=cc=cc=c1.
Properties
Chemical formula C8H8K2
Appearance beige solid
Except where otherwise noted, data are given for materials in their standard state (at 25 °C , 100 kPa). Infobox references
Chemical compound

Dipotassium cyclooctatetraenide, sometimes abbreviated K2COT, is an organopotassium compound with the formula K2C8H8. It is a brown solid that is used as a precursor to cyclooctatetraenide complexes, such as uranocene (U(C8H8)2). Analogs of K2C8H8 are known with ring substituents, with different alkali metals, and with various complexants.

Ball-and-stick model of COT

Preparation and structure

Potassium cyclooctatetraenide is formed by the reaction of cyclooctatetraene with potassium metal:

2 K + C8H8 → K2C8H8

The reaction entails 2-electron reduction of the polyene and is accompanied by a color change from colorless to brown.

The structure of K2(diglyme)C8H8 has been characterized by X-ray crystallography of the derivatives with diglyme complexed to the potassium cations. The C8H8 unit is planar with an average C-C distance of 1.40 A.

References

  1. A. L Wayda (1990). "Cyclooctatetraene Lanthanide Complexes. Lu(C8 H8 )Cl(THF) and Lu(C8 H8 )[o -C6 H4 CH2 N(CH3 )2 ](THF)". Cyclooctatetraene Lanthanide Complexes. Lu(C8H8Cl(thf) and Lu(C8H8)[o-C6H4CH2N(CH3)2(thf). Inorganic Syntheses. Vol. 27. pp. 150–154. doi:10.1002/9780470132586.ch28. ISBN 9780470132586.
  2. J. H. Noordik, T. E. M. van den Hark, J. J. Mooij and A. A. K. Klaassen (1974). "Dipotassium(I) cyclooctatetraenide-1-methoxy-2-(2-methoxyethoxy)ethane". Acta Crystallogr B. 30 (3): 833–835. doi:10.1107/S0567740874003840.{{cite journal}}: CS1 maint: multiple names: authors list (link)
Categories: