title: Isolation of a hexanuclear chromium cluster with a tetrahedral hydridic core and its catalytic behavior for ethylene oligomerization.
abstract: A chromium complex [2-(NHCH2PPh2)C5H4N]CrCl3·THF2 (1) of the ligand PyNHCH2PPh2 has been synthesized, characterized, and examined for its catalytic behavior toward ethylene oligomerization. When complex 1 was treated with (i-Bu)3Al, an unprecedented divalent polyhydride chromium cluster μ,κ(1),κ(2),κ(3)-N,N,P-{[2-(NCH2PPh2)C5H4N]Cr(μ-H)}4[(μ-Cl)Cr(μ-Cl)Al(i-Bu)2Cl]2 (2) was obtained. The complex contains a Cr4H4 core, which is expected to be diamagnetic, and which remains coordinated to two additional divalent high-spin Cr atoms via bridging interactions. Two aluminate residues remain bonded to the peripheral chromium atoms. The structure, magnetism, and electronic configuration are herein discussed.
authors.affiliation: Department of Chemistry, University of Ottawa , 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Alzamly
authors.forename: Sandro
authors.initials: S
authors.lastname: Gambarotta
authors.forename: Ilia
authors.initials: I
authors.lastname: Korobkov
authors.forename: Muralee
authors.initials: M
authors.lastname: Murugesu
authors.forename: Jennifer J H
authors.initials: JJ
authors.lastname: Le Roy
authors.forename: Peter H M
authors.initials: PH
authors.lastname: Budzelaar