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).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry