Organotransition-Metal Metallacarboranes. 8. Mono-, Di-, and Triiron Polyarene Sandwich Complexes of Et2C2B4H42-Containing Fluorene, 9,10-Dihydroanthracene, or [2.2]Paracyclophane Ligands

James T. Spencer, Russell N. Grimes

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32 Scopus citations


This paper describes the synthesis of mixed-ligand carborane-iron-polycyclic arene complexes from nido-2,3-Et2C2B4H6together with structural characterization of the products via11B and1H NMR, infrared, and mass spectroscopic data. All products reported were isolated as air-stable crystalline solids. The main preparative route utilized displacement of the neutral ligand (L) from (η6-L)Fe(Et2C2B4H4) (L = C8H10or C16H18) by arenes. In an alternative approach, the previously known naphthalene species (n6-C10H8)-Fe(Et2C2B4H4) was obtained directly from the Et2C2B4H5_ion, FeC12, and the naphthaleneide dianion. A monoiron fluorene complex (n6-C13H10)Fe(Et2C2B4H4) (6) was prepared via both routes, employing displacement of C8H10from (n6-C8H10)Fe(Et2C2B4H4) (2) as well as direct treatment of Et2C2B4H5-with - C13H10-and FeCl2. The thermal reaction of 6 with 2 gave a staggered triple-decker diiron species (n6,n6-C13H10)Fe2(Et2C2B4H4)2(7) and a staggered quadruple-decker triiron complex Fe[(C13H10)Fe-(Et2C2B4H4)]2(8), whose proposed structures are supported by spectroscopic evidence and by X-ray crystallographic data on 6 and 7. “Decapitation” (apex BH removal) of 6 was achieved by treatment with tetramethylethylenediamine giving nido-(η6-C13H10)Fe(Et2C2B3H5).

Original languageEnglish (US)
Pages (from-to)323-328
Number of pages6
Issue number2
StatePublished - Feb 1 1987
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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