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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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posted on 2023-06-10, 01:36 authored by Gareth R Owen, Nikolaos Tsoureas, Rebecca F Hope, Yu-Ying Kuo, Mairi F HaddowTwo 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){?3-NNH-HB (azaindolyl)2(Ar)}] (where M = rhodium, iridium; Ar = 1-naphthyl, mesityl; COD = 1,5-cyclooctadiene) and [Rh(NBD){?3-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){?3-NNH-HB (azaindolyl)2(mesityl)}], [Ir(COD){?3-NNH-HB (azaindolyl)2(mesityl)}] and [Rh(NBD){?3-NNH-HB (azaindolyl)2(naphthyl)}] confirm the expected ?3-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. © 2011 The Royal Society of Chemistry.
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Journal
Dalton TransactionsISSN
1477-9226Publisher
Royal Society of ChemistryExternal DOI
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22Volume
40Page range
5906-5915Event location
EnglandDepartment affiliated with
- Chemistry Publications
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- Yes
Legacy Posted Date
2021-11-01First Compliant Deposit (FCD) Date
2021-10-30Usage metrics
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