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Issue 24, 2016
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Structure and bonding of group 4-nickel heterobimetallics supported by 2-(diphenylphosphino)pyrrolide ligands

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Abstract

The synthesis of a full series of group 4/nickel complexes supported by a 2-(diphenylphosphino)pyrrolide (NP) ligand is reported. Treatment of the homoleptic, 8-coordinate M(NP)4 monometallic precursors with Ni(COD)2 (COD = 1,5-cyclooctadiene) yielded the heterobimetallic complexes (κ2-NP)M(μ2-NP)3Ni (M = Ti, Zr, Hf). Although X-ray crystallographic analysis reveals similarly short metal–metal distances in all three complexes, quantum chemical calculations indicate that ZrNi (5) and HfNi (6) contain only single Ni → M dative bonds while TiNi (4) has an additional Ti–Ni π-bond. All three complexes have quasireversible reductions by cyclic voltammetry, and 1-electron chemical reduction of 4 by Na(Hg) yields the anion, [Na][(κ2-NP)Ti(μ2-NP)3Ni] (7). X-ray and computational analysis indicate that the 1-electron reduction of 4 completely breaks the metal–metal bond, yielding a formally TiIII–Ni0 complex. Ti–Ni bonding can also be disrupted by coordination of CO, wherein Ni → CO backbonding effectively outcompetes Ni → Ti dative bonding.

Graphical abstract: Structure and bonding of group 4-nickel heterobimetallics supported by 2-(diphenylphosphino)pyrrolide ligands

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Supplementary files

Article information


Submitted
31 Jan 2016
Accepted
25 Feb 2016
First published
01 Mar 2016

Dalton Trans., 2016,45, 9892-9901
Article type
Paper

Structure and bonding of group 4-nickel heterobimetallics supported by 2-(diphenylphosphino)pyrrolide ligands

P. L. Dunn, R. K. Carlson, L. Gagliardi and I. A. Tonks, Dalton Trans., 2016, 45, 9892
DOI: 10.1039/C6DT00431H

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