Synthesis and structural characterization of copper complexes containing “R-substituted” Bis-7-azaindolyl borate ligands
Synthesis and structural characterization of copper complexes containing “R-substituted” Bis-7-azaindolyl borate ligands
The coordination chemistry of scorpionate ligands based on borates containing the 7-azaindole heterocycle is relatively unexplored. Thus, there is a requirement to further understand their coordination chemistry. This article outlines the synthesis and characterization of a family of complexes containing anionic flexible scorpionate ligands of the type [(R)(bis-7-azaindolyl)borohydride]− ([RBai]−), where R = Me, Ph or naphthyl. The three ligands were coordinated to a series of copper(I) complexes containing a phosphine co-ligand to form the complexes, [Cu(MeBai)(PPh3)] (1), [Cu(PhBai)(PPh3)] (2), [Cu(NaphthBai)(PPh3)] (3), [Cu(MeBai)(PCy3)] (4), [Cu(PhBai)(PCy3)] (5) and [Cu(NaphthBai)(PCy3)] (6). Additional copper(II) complexes, namely, [Cu(MeBai)2] (7) and [Cu(PhBai)2] (8), were obtained during attempts to obtain single crystals from complexes 4 and 2, respectively. Complexes 7 and 8 were also prepared independently from CuCl2 and two equivalents of the corresponding Li[RBai] salt alongside an additional complex, namely, [Cu(NaphthBai)2] (9). The copper(I) and copper(II) complexes were characterized using spectroscopic and analytical methods. Furthermore, a crystal structure was obtained for eight of the nine complexes. In all cases, the boron-based ligand was found to bind to the metal centers via a κ3-N,N,H coordination mode.
borohydride, coordination, copper, ligand, nitrogen, scorpionate
Jackson, Miriam
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Thomas, Simon D.
339e6b3c-9ae9-491b-97ad-76f942e3c2b5
Tizzard, Graham J.
8474c0fa-40df-43a6-a662-7f3c4722dbf2
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Owen, Gareth R.
fd633ee9-dcaa-438c-9b3b-82e9d091a1c6
June 2023
Jackson, Miriam
782cae03-0c00-44f0-b87f-5a2b26dc0bf9
Thomas, Simon D.
339e6b3c-9ae9-491b-97ad-76f942e3c2b5
Tizzard, Graham J.
8474c0fa-40df-43a6-a662-7f3c4722dbf2
Coles, Simon J.
3116f58b-c30c-48cf-bdd5-397d1c1fecf8
Owen, Gareth R.
fd633ee9-dcaa-438c-9b3b-82e9d091a1c6
Jackson, Miriam, Thomas, Simon D., Tizzard, Graham J., Coles, Simon J. and Owen, Gareth R.
(2023)
Synthesis and structural characterization of copper complexes containing “R-substituted” Bis-7-azaindolyl borate ligands.
Molecules, 28 (12), [4825].
(doi:10.3390/molecules28124825).
Abstract
The coordination chemistry of scorpionate ligands based on borates containing the 7-azaindole heterocycle is relatively unexplored. Thus, there is a requirement to further understand their coordination chemistry. This article outlines the synthesis and characterization of a family of complexes containing anionic flexible scorpionate ligands of the type [(R)(bis-7-azaindolyl)borohydride]− ([RBai]−), where R = Me, Ph or naphthyl. The three ligands were coordinated to a series of copper(I) complexes containing a phosphine co-ligand to form the complexes, [Cu(MeBai)(PPh3)] (1), [Cu(PhBai)(PPh3)] (2), [Cu(NaphthBai)(PPh3)] (3), [Cu(MeBai)(PCy3)] (4), [Cu(PhBai)(PCy3)] (5) and [Cu(NaphthBai)(PCy3)] (6). Additional copper(II) complexes, namely, [Cu(MeBai)2] (7) and [Cu(PhBai)2] (8), were obtained during attempts to obtain single crystals from complexes 4 and 2, respectively. Complexes 7 and 8 were also prepared independently from CuCl2 and two equivalents of the corresponding Li[RBai] salt alongside an additional complex, namely, [Cu(NaphthBai)2] (9). The copper(I) and copper(II) complexes were characterized using spectroscopic and analytical methods. Furthermore, a crystal structure was obtained for eight of the nine complexes. In all cases, the boron-based ligand was found to bind to the metal centers via a κ3-N,N,H coordination mode.
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molecules-28-04825
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Accepted/In Press date: 13 June 2023
e-pub ahead of print date: 17 June 2023
Published date: June 2023
Additional Information:
Funding Information:
The authors would like to thank the Welsh Government for funding this work. The project was partly funded by a Sêr Cymru II Capacity Builder Accelerator Award (80761-USW208) and partly funded by a KESS2 PhD studentship (M.J.). The Sêr Cymru II and KESS schemes were funded by the European Regional Development and European Social Funds. We are also grateful to Tata Steel UK who co-funded the PhD studentship.
Keywords:
borohydride, coordination, copper, ligand, nitrogen, scorpionate
Identifiers
Local EPrints ID: 480940
URI: http://eprints.soton.ac.uk/id/eprint/480940
ISSN: 1420-3049
PURE UUID: dbe302f9-e4dc-4897-986a-eea74848bba4
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Date deposited: 10 Aug 2023 17:02
Last modified: 18 Mar 2024 02:54
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Author:
Miriam Jackson
Author:
Simon D. Thomas
Author:
Gareth R. Owen
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