Organotransition-Metal Metallacarboranes. 8. Mono-, Di-, and Triiron Polyarene Sandwich Complexes of Et2C2B4H4(2-) Containing Fluorene, 9,10-Dihydroanthracene, or (2.2)Paracyclophane Ligands

摘要

This paper describes the synthesis of mixed-ligand carborane-iron-polycyclic arene complexes from nido-2,3-Et2C2B4H6 together with structural characterization of the products via Boron and Hydrogen 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 (n6-L)Fe(Et2C2B4H4) (L = C8H10 or C16H18) by arenes. In an alternative approach, the previously known naphthalene species (n6-C10H8)-Fe (Et2C2B4H4) was obtained directly from the ion, FeC12 and the naphthaleneide dianion. Amonoiron fluorene complex (n6C13H10)Fe(Et2C2B4H4) (6) was prepared via both routes, employing displacement of C8H10 from (n6,C8H10)Fe(Et2C2B4H4) (2) as well as direct treatment of Et2C2B4H5 with C13H10 and FeC12.