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Issue 22, 2011
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Synthesis and characterisation of group nine transition metal complexes containing new mesityl and naphthyl based azaindole scorpionate ligands

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Abstract

Two novel boron-based flexible scorpionate ligands based on 7-azaindole, Li[HB(azaindolyl)2(1-naphthyl)] and Li[HB(azaindolyl)2(mesityl)] {Li[NaphthBai] and Li[MesBai] respectively}, have been prepared (mesityl = 2,4,6-trimethylphenyl). These salts have been isolated in two forms, either as dimeric structures which contain bridging hydride interactions with the lithium centres or as crystalline material containing mono nuclear bis-acetonitrile solvates. The newly formed ligands have been utilised to prepare a range of group nine transition metal complexes with the general formula [M(COD){κ3-NNH-HB (azaindolyl)2(Ar)}] (where M = rhodium, iridium; Ar = 1-naphthyl, mesityl; COD = 1,5-cyclooctadiene) and [Rh(NBD){κ3-NNH-HB (azaindolyl)2(Ar)}] (where NBD = 2,5-norbornadiene; Ar = 1-naphthyl, mesityl). These new complexes have been compared to the previously reported compounds which contain the related scorpionate ligands Li[HB(azaindolyl)2(phenyl)] and K[HB(azaindolyl)3] {Li[PhBai] and K[Tai] respectively}. Structural characterisation of the complexes [Rh(COD){κ3-NNH-HB (azaindolyl)2(mesityl)}], [Ir(COD){κ3-NNH-HB (azaindolyl)2(mesityl)}] and [Rh(NBD){κ3-NNH-HB (azaindolyl)2(naphthyl)}] confirm the expected κ3-NNH coordination mode for these new ligands. Spectroscopic analysis suggests strong interactions of the B–H functional group with the metal centres in all cases.

Graphical abstract: Synthesis and characterisation of group nine transition metal complexes containing new mesityl and naphthyl based azaindole scorpionate ligands

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Article information


Submitted
12 Nov 2010
Accepted
22 Mar 2011
First published
28 Apr 2011

Dalton Trans., 2011,40, 5906-5915
Article type
Paper

Synthesis and characterisation of group nine transition metal complexes containing new mesityl and naphthyl based azaindole scorpionate ligands

G. R. Owen, N. Tsoureas, R. F. Hope, Y. Kuo and M. F. Haddow, Dalton Trans., 2011, 40, 5906
DOI: 10.1039/C0DT01576H

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