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[1] [2] Dinitrogen is able to coordinate to metals in five different ways. The more well-characterised ways are the end-on M←N≡N (η 1) and M←N≡N→M (μ, bis-η 1), in which the lone pairs on the nitrogen atoms are donated to the metal cation.
Mo(N 2) 2 (dppe) 2 is an octahedral complex with idealized D 2h point group symmetry. The dinitrogen ligands are mutually trans across the metal center. The Mo-N bond has a length of 2.01 Å, and the N-N bond has a length of 1.10 Å. [2]
One quintessential dinitrogen complex of a main group element is Gernot Frenking’s triphenylphosphinazine, first reported in 2013 in Angewandte Communications. [6] This compound was notable for demonstrating the double Lewis acid behavior of dinitrogen, as the publication describes the N 2 moiety in the doubly excited 1 Γ g state with four lone pairs on N—N fragment.
The N-N distance in complex (1.258(3) and 1.268(3) Å) is remarkably [editorializing] longer than that of dinitrogen triple-bond (1.098 Å) and comparable with N=N double bond character in N 2 2-. The N 2 2ˉ anion could also be protonated to diazene (N 2 H 2) with the intramolecular deprotonation of THF under the heating condition. [citation ...
The first three ionisation energies of nitrogen are 1.402, 2.856, and 4.577 MJ·mol −1, ... elemental nitrogen usually occurs as molecular N 2, dinitrogen.
Nitrogen fixation is a chemical process by which molecular dinitrogen (N 2) is converted into ammonia (NH 3). [1] It occurs both biologically and abiologically in chemical industries. Biological nitrogen fixation or diazotrophy is catalyzed by enzymes called nitrogenases. [2]
The dinitrogen complex trans-[IrCl(N 2)(PPh 3) 2] is made by treating Vaska's complex with aromatic acyl azides. It has a planar geometry. [7] The first preparation of a metal-dinitrogen complex using dinitrogen was reported in 1967 by Yamamoto and coworkers. They obtained [Co(H)(N 2)(PPh 3) 3] by reduction of Co(acac) 3 with AlEt 2 OEt under ...
N 2 + 6 H + + 6 e − → 2 NH 3. The reductive protonation of metal dinitrogen complexes was popularized by Chatt and coworkers, using Mo(N 2) 2 (dppe) 2 as substrate. Treatment of this complex with acid gave substantial amounts of ammonium. [3] This work revealed the existence of several intermediates, including hydrazido complexes (Mo=N-NH 2 ...