title: Aluminum-stabilized low-spin iron(II) hydrido complexes of 1,4,7-trimethyl-1,4,7-triazacyclononane.
abstract: We investigated herein the reactions of (Me3tacn)FeCln (1a: n = 3, 1b: n = 2) with common aluminum hydride reagents and a bulky dihydridoaluminate {Li(ether)2}{Al(OC6H3-2,6-(t)Bu2)}(μ-H)2, which yielded the diamagnetic hydrido complexes 2-4 containing Fe(II) and Al(III). In particular, the use of divalent 1b afforded excellent isolated yields. The structures of 2-4 were determined using spectroscopic and crystallographic analyses. The crystal structures showed distorted octahedral Fe centers and fairly short Fe-Al distances [2.19-2.24 Å]. The structures of cation moiety 2 and neutral complex 4 were further probed using DFT calculations, which indicated a stable low-spin Fe(II) state and strongly electron-donating nature of the (Me3tacn)FeH3 fragment toward the Al(III) center.
authors.affiliation: Graduate School of Science and Engineering, Tokyo Institute of Technology , 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
authors.forename: Masataka
authors.initials: M
authors.lastname: Oishi
authors.forename: Togo
authors.initials: T
authors.lastname: Endo
authors.forename: Masato
authors.initials: M
authors.lastname: Oshima
authors.forename: Hiroharu
authors.initials: H
authors.lastname: Suzuki
mesh_terms: D000535:Aluminum / Q000737:chemistry*; D001372:Aza Compounds / Q000737:chemistry*; D056831:Coordination Complexes / Q000138:chemical synthesis* / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D011789:Quantum Theory
chemical_list: C499747:1,4,7-trimethyl-1,4,7-triazacyclononane; D001372:Aza Compounds; D056831:Coordination Complexes; D000535:Aluminum; D007501:Iron