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Jackson M, Thomas SD, Tizzard GJ, Coles SJ, Owen GR. Synthesis and Structural Characterization of Copper Complexes Containing "R-Substituted" Bis-7-Azaindolyl Borate Ligands. Molecules 2023; 28:4825. [PMID: 37375380 DOI: 10.3390/molecules28124825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/09/2023] [Accepted: 06/13/2023] [Indexed: 06/29/2023] Open
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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Affiliation(s)
- Miriam Jackson
- Chemical and Environmental Sciences, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 4AT, UK
| | - Simon D Thomas
- Chemical and Environmental Sciences, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 4AT, UK
| | - Graham J Tizzard
- UK National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Simon J Coles
- UK National Crystallography Service, School of Chemistry, University of Southampton, Highfield, Southampton SO17 1BJ, UK
| | - Gareth R Owen
- Chemical and Environmental Sciences, Faculty of Computing, Engineering and Science, University of South Wales, Pontypridd CF37 4AT, UK
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2
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Fürpaß KM, Peschel LM, Schachner JA, Borisov SM, Krenn H, Belaj F, Mösch‐Zanetti NC. Vapochromism and Magnetochemical Switching of a Nickel(II) Paddlewheel Complex by Reversible NH 3 Uptake and Release. Angew Chem Int Ed Engl 2021; 60:13401-13404. [PMID: 33773004 PMCID: PMC8251872 DOI: 10.1002/anie.202102149] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Indexed: 12/30/2022]
Abstract
Reaction of [NiCl2 (PnH)4 ] (1) (PnH=6-tert-butyl-pyridazine-3-thione) with NiCl2 affords the binuclear paddlewheel (PW) complex [Ni2 (Pn)4 ] (2). Diamagnetic complex 2 is the first example of a PW complex capable of reversibly binding and releasing NH3 . The NH3 ligand in [Ni2 (Pn)4 (NH3 )] (2⋅NH3 ) enforces major spectroscopic and magnetic susceptibility changes, thus displaying vapochromic properties (λmax (2)=532 nm, λmax (2⋅NH3 )=518 nm) and magnetochemical switching (2: S=0; 2⋅NH3 : S=1). Upon repeated adsorption/desorption cycles of NH3 the PW core remains intact. Compound 2 can be embedded into thin polyurethane films (2P ) under retention of its sensing abilities. Therefore, 2 qualifies as reversible optical probe for ammonia. The magnetochemical switching of 2 and 2⋅NH3 was studied in detail by SQUID measurements showing that in 2⋅NH3 , solely the Ni atom coordinated the NH3 molecule is responsible for the paramagnetic behavior.
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Affiliation(s)
| | - Lydia M. Peschel
- Institute of ChemistryUniversity of GrazSchubertstrasse 18010GrazAustria
| | - Jörg A. Schachner
- Institute of ChemistryUniversity of GrazSchubertstrasse 18010GrazAustria
| | - Sergey M. Borisov
- Institute of Analytical Chemistry and Food ChemistryGraz University of TechnologyStremayrgasse 98010GrazAustria
| | - Heinz Krenn
- Institute of PhysicsUniversity of GrazUniversitätsplatz 58010GrazAustria
| | - Ferdinand Belaj
- Institute of ChemistryUniversity of GrazSchubertstrasse 18010GrazAustria
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3
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Fürpaß KM, Peschel LM, Schachner JA, Borisov SM, Krenn H, Belaj F, Mösch‐Zanetti NC. Vapochromism and Magnetochemical Switching of a Nickel(II) Paddlewheel Complex by Reversible NH
3
Uptake and Release. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Katharina M. Fürpaß
- Institute of Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Lydia M. Peschel
- Institute of Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Jörg A. Schachner
- Institute of Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Sergey M. Borisov
- Institute of Analytical Chemistry and Food Chemistry Graz University of Technology Stremayrgasse 9 8010 Graz Austria
| | - Heinz Krenn
- Institute of Physics University of Graz Universitätsplatz 5 8010 Graz Austria
| | - Ferdinand Belaj
- Institute of Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
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4
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Raubenheimer HG, Dobrzańska L. Interaction between Cu and Ag free ions and central metals in complexes with XHn units (X = B, Si, N, O, C, Al, Zn, Mg; n = 1, 2). Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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5
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Beheshti A, Mousavifard ES, Zargar B, Mayer P, Rezatofighi SE. Synthesis and dye adsorption studies of the {dibromo(1,1′-(1,2-ethanediyl)bis(3-methyl-imidazole-2-thione)dicopper( i)} n polymer and its conversion to CuO nanospheres for photocatalytic and antibacterial applications. NEW J CHEM 2020. [DOI: 10.1039/d0nj01721c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A new copper polymer was used as a dye adsorbent and CuO precursor. The CuO nanospheres showed good performances for photocatalytic and antibacterial applications.
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Affiliation(s)
- Azizolla Beheshti
- Department of Chemistry
- Faculty of Sciences
- Shahid Chamran University of Ahvaz
- Ahvaz
- Iran
| | | | - Behrooz Zargar
- Department of Chemistry
- Faculty of Sciences
- Shahid Chamran University of Ahvaz
- Ahvaz
- Iran
| | - Peter Mayer
- LMU München Department Chemie
- Butenandtstrasse
- München
- Germany
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6
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Uncoordination mode of к0-Janus scorpionate with La(III) and Ce(III) complexes: Synthesis, characterization, thermolysis and crystal structure determination. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.08.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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Stuhl C, Maichle-Mössmer C, Anwander R. Magnesium Stung by Nonclassical Scorpionate Ligands: Synthesis and Cone-Angle Calculations. Chemistry 2018; 24:14254-14268. [PMID: 29993157 DOI: 10.1002/chem.201803067] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2018] [Revised: 07/11/2018] [Indexed: 12/24/2022]
Abstract
A series of tris(pyrazolyl)alkane (RCTp) scorpionate ligands of the type RCTp3-R' (R=Me, nBu, SiMe3 ; R'=H, Me, Ph, iPr, tBu) were synthesized and their ability to coordinate methylmagnesium moieties was examined. The reaction of Mg(AlMe4 )2 with neutral proligands HCTp3-Ph or Me3 SiCTp3-Me , containing a non-innocent backbone methine moiety, led to deprotonation/rearrangement and SiMe3 /AlMe3 exchange to afford [(Me3 AlCTp3-Ph )2 Mg] and [(Me3 AlCTp3-Me )Mg(AlMe4 )], respectively, with monoanionic tripodal ligands. Treatment of sterically less demanding RCTp3-R' with Mg(AlMe4 )2 produced isostructural dicationic "metal-in-a-box" complexes of the type [(RCTp3-R' )2 Mg][AlMe4 ]2 (R=Me, nBu; R'=H, Me). Utilization of the superbulky ligands MeCTp3-Ph and MeCTp3-tBu gave monocationic complexes [(MeCTp3-Ph )MgMe][AlMe4 ] and [(MeCTp3-tBu )MgMe][Al2 Me7 ] as separated ion pairs. The reaction of Mg(AlMe4 )2 with nBuCTp3-Ph led to the formation of the dimagnesium complex [{(nBuCTp3-Ph )Mg(AlMe4 )}2 (μ-CH3 )], which features a bridging methyl moiety and terminal η1 -coordinated tetramethylaluminato ligands. Isopropyl-substituted ligand MeCTp3-iPr emerged from further fine-tuning of the steric and electronic parameters and, upon reaction with Mg(AlMe4 )2 , gave (MeCTp3-iPr )Mg(AlMe4 )2 ; this represents the first example of a magnesium bis(alkyl) complex with an intact RCTp3-R' ligand. The exact ligand cone angles Θ° of all magnesium complexes were determined according to the mathematical analysis developed by Allen et al. [J. Comput. Chem. 2013, 34, 1189-1197].
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Affiliation(s)
- Christoph Stuhl
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Cäcilia Maichle-Mössmer
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Reiner Anwander
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
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8
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Holler S, Belaj F, Mösch-Zanetti NC. {(Hydrogen 2,2′,2′′-boranetriyl)tris[6-tert-butyl-4-methylpyridazine-3(2H)-thione]-κ3H,S,S′}(triphenylphosphane-κP)copper(I) chloroform disolvate. IUCRDATA 2017. [DOI: 10.1107/s2414314617017722] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
In the title complex, [Cu(C27H40BN6S3)(C18H15P)]·2CHCl3, the CuIatom is surrounded in a trigonal-planar arrangement by the triphenylphosphane ligand and two of the three S atoms of the scorpionate ligand with an additional 3-center–2-electron B—H...Cu interaction, with the H atom as the apex of a pyramid [B—H = 1.140 (17) Å and Cu—H = 1.826 (16) Å].
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9
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Tüchler M, Holler S, Huber E, Fischer S, Boese AD, Belaj F, Mösch-Zanetti NC. Synthesis and Characterization of a Thiopyridazinylmethane-Based Scorpionate Ligand: Formation of Zinc Complexes and Rearrangement Reaction. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00568] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Michael Tüchler
- Institute
of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse
1, 8010 Graz, Austria
| | - Stefan Holler
- Institute
of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse
1, 8010 Graz, Austria
| | - Elke Huber
- Institute
of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse
1, 8010 Graz, Austria
| | - Susanne Fischer
- Institute
of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse
1, 8010 Graz, Austria
- Institute
of Chemistry, Physical and Theoretical Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
| | - A. Daniel Boese
- Institute
of Chemistry, Physical and Theoretical Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria
| | - Ferdinand Belaj
- Institute
of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse
1, 8010 Graz, Austria
| | - Nadia C. Mösch-Zanetti
- Institute
of Chemistry, Inorganic Chemistry, University of Graz, Schubertstrasse
1, 8010 Graz, Austria
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10
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Tüchler M, Holler S, Schachner JA, Belaj F, Mösch-Zanetti NC. Unusual C-N Coupling Reactivity of Thiopyridazines: Efficient Synthesis of Iron Diorganotrisulfide Complexes. Inorg Chem 2017; 56:8159-8165. [PMID: 28654286 DOI: 10.1021/acs.inorgchem.7b00865] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of iron(II) triflate with 6-tert-butyl-3-thiopyridazine (PnH) and 4-methyl-6-tert-butyl-3-thiopyridazine (MePnH) respectively led to iron bis(diorganotrisulfide) complexes [Fe(RPnS3PnR)2](OTf)2 [R = H (1a) and Me (2a)]. The corresponding perchlorate complexes were prepared by using the iron(II) chloride precursor and the subsequent addition of 2 equiv of NaClO4, giving [Fe(RPnS3PnR)2](ClO4)2 [R = H (1b) and Me (2b)]. The compounds were fully characterized including single-crystal X-ray diffraction analysis. All four compounds exhibit nearly perfect octahedral geometries with an iron center coordinated by four nitrogen atoms from two RPnS3PnR ligands and by two sulfur atoms of the central atom in the S3 unit. The diamagnetic complexes exhibit unusually high redox potentials for the Fe2+/3+ couple at E1/2 = 1.15 V (for 1a and 1b) and 1.08 V (for 2a and 2b) versus Fc/Fc+, respectively, as determined by cyclic voltammetry. Furthermore, the source of the extra sulfur atom within the S3 unit was elucidated by isolation of C-N-coupled pyridazinylthiopyridazine products.
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Affiliation(s)
- Michael Tüchler
- Institute of Chemistry, University of Graz , Schubertstrasse 1, 8010 Graz, Austria
| | - Stefan Holler
- Institute of Chemistry, University of Graz , Schubertstrasse 1, 8010 Graz, Austria
| | - Jörg A Schachner
- Institute of Chemistry, University of Graz , Schubertstrasse 1, 8010 Graz, Austria
| | - Ferdinand Belaj
- Institute of Chemistry, University of Graz , Schubertstrasse 1, 8010 Graz, Austria
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11
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Shiu LC, Chuang JH, Lee GH, Wu TS, Shiu KB. Anion-aided Dynamic One-pot Self-assembly of Rectangular Metallacycles. J CHIN CHEM SOC-TAIP 2017. [DOI: 10.1002/jccs.201700044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ler-Chun Shiu
- Department of Chemistry; National Cheng Kung University; Tainan 70101 Taiwan
| | - Jen-Han Chuang
- Department of Chemistry; National Cheng Kung University; Tainan 70101 Taiwan
| | - Gene-Hsiang Lee
- Instrument Center; National Taiwan University; Tapei 10617 Taiwan
| | - Tian-Shung Wu
- School of Pharmacy; National Cheng Kung University; Tainan 70101 Taiwan
| | - Kom-Bei Shiu
- Department of Chemistry; National Cheng Kung University; Tainan 70101 Taiwan
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12
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Jayakumar S, Mahendiran D, Rehana D, Kalilur Rahiman A. Heteroleptic metal(II) complexes of hydrotris(methimazolyl)borate and diimines: Synthesis, theoretical calculations, antimicrobial, antioxidant, in vitro cytotoxicity and molecular docking studies. Microb Pathog 2017; 109:120-130. [PMID: 28546116 DOI: 10.1016/j.micpath.2017.05.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 01/21/2017] [Accepted: 05/19/2017] [Indexed: 11/18/2022]
Abstract
A series of heteroleptic metal(II) complexes of formulation [M(Tm)(diimine)](ClO4) (1-8), [Tm = hydrotris(methimazolyl)borate, diimine = 2,2'-bipyridyl or 1,10-phenanthroline and M = Mn(II), Ni(II), Cu(II) or Zn(II)] have been synthesized and characterized by spectroscopic methods. The geometric parameters of the complexes were determined using UV-Vis spectroscopy and DFT calculations. The analyses of HOMO and LUMO have been used to explain the charge transfer within the molecule. Antimicrobial activity of the synthesized heteroleptic complexes were evaluated against two Gram (-ve) (Escherichia coli and Klebsiella pneumoniae) and two Gram (+ve) (Bacillus cereus and Staphylococcus aureus) bacterial, and three fungal (Candida albicans, Candida glabrata and Candida krusei) strains with respect to the standard drugs erythromycin and amphotericin-B. The copper(II) complex 6 showed better scavenging activity against DPPH when compared to other complexes. The cytotoxic activity of copper(II) complexes 5 and 6 against MCF-7 cell line was assessed by MTT assay, which showed exponential responses toward increasing concentration of complexes. In the molecular docking studies, the complexes showed π-π, σ-π, hydrogen bonding, van der Waals and electrostatic interactions with FGFR kinase receptor.
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Affiliation(s)
- S Jayakumar
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), Chennai 600 014, India; Department of Chemistry, Misrimal Navajee Munoth Jain Engineering College, Thoraipakkam, Chennai 600 097, India
| | - D Mahendiran
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), Chennai 600 014, India
| | - Dilaveez Rehana
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), Chennai 600 014, India; Department of Chemistry, Justice Basheer Ahmed Sayeed College for Women (Autonomous), Chennai 600 018, India
| | - A Kalilur Rahiman
- Post-Graduate and Research Department of Chemistry, The New College (Autonomous), Chennai 600 014, India.
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14
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Tüchler M, Holler S, Rendl S, Stock N, Belaj F, Mösch‐Zanetti NC. Zinc Scorpionate Complexes with a Hybrid (Thiopyridazinyl)(thiomethimidazolyl)borate Ligand. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201501366] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michael Tüchler
- Institute of Chemistry Inorganic Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Stefan Holler
- Institute of Chemistry Inorganic Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Sarah Rendl
- Institute of Chemistry Inorganic Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Natascha Stock
- Institute of Chemistry Inorganic Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Ferdinand Belaj
- Institute of Chemistry Inorganic Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
| | - Nadia C. Mösch‐Zanetti
- Institute of Chemistry Inorganic Chemistry University of Graz Schubertstrasse 1 8010 Graz Austria
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Imran M, Mix A, Neumann B, Stammler HG, Monkowius U, Bleckenwegner P, Mitzel NW. Synthesis, structural and photo-physical studies of bismuth(III) complexes with Janus scorpionate and co-ligands. Dalton Trans 2014; 43:10956-68. [PMID: 24906201 DOI: 10.1039/c4dt00668b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Some novel complexes of bismuth(III) with the Janus scorpionate ligand [HB(mtda(Me))3](-) (mtda(Me) = 2-mercapto-5-methyl-1,3,4-thiadiazolyl) were synthesised. Na[HB(mtda(Me))3] (1) was reacted with BiX3 (X = Cl, I, NO3) in the molar ratio 2 : 1 to afford the bismuth complexes {HB(mtda(Me))3}2BiCl (3), Na[{HB(mtda(Me))3}2BiI2] (4) and [{HB(mtda(Me))3}2Bi(NO3)]n (5). Two mixed complexes {HB(mtda(Me))3}Bi(phen)Cl2 (6) and {HB(mtda(Me))3}Bi(bipy)Cl2 (7) were obtained using Janus scorpionate as the primary ligand in the presence of 1,10-phenanthroline and 2,2'-bipyridyl, respectively, as co-ligands in the 1 : 1 ratio. The obtained complexes were characterised by (1)H, (13)C and diffusion NMR (DOSY), elemental analyses and mass spectrometry. Structures of the compounds NBu4[HB(mtda(Me))3] (2), 3, 4, 5, 6 and 7 were determined by single crystal X-ray diffraction. The molecular dynamic process in complex 3 was also studied by variable temperature NMR measurements. All bismuth complexes, except for the polymeric 5, are monomeric. Complexes 6 and 7 exhibit (B)H···Bi distances of 2.76(3) and 2.71(2) Å length, respectively. Compounds 2, 6 and 7 were screened for their luminescence activity. At 77 K in ethanol solution, complexes 6 and 7 exhibit phosphorescence from ligand-to-ligand charge transfer (LLCT) and the ligand-centred (LC) excited state, respectively.
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Affiliation(s)
- Muhammad Imran
- Universität Bielefeld, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien, CM2, Universitätsstraße 25, 33615 Bielefeld, Germany.
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16
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Imran M, Mix A, Neumann B, Stammler HG, Monkowius U, Bleckenwegner P, Mitzel NW. Boron-centered soft ligands based on tetrazole units and their complexes with sodium, potassium and bismuth ions. Dalton Trans 2014; 43:14737-48. [DOI: 10.1039/c4dt01931h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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17
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Imran M, Neumann B, Stammler HG, Monkowius U, Ertl M, Mitzel NW. Borate-based ligands with two soft heterocycle/thione groups and their sodium and bismuth complexes. Dalton Trans 2014; 43:1267-78. [DOI: 10.1039/c3dt52607k] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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18
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Owen GR, Gould PH, Moore A, Dyson G, Haddow MF, Hamilton A. Copper and silver complexes bearing flexible hybrid scorpionate ligand mpBm. Dalton Trans 2013; 42:11074-81. [PMID: 23799531 DOI: 10.1039/c3dt51286j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The addition of flexible scorpionate ligand, [mpBm]⁻{i.e. HB(mt)2(mp), where mt = methyl-2-mercaptoimidazole and mp = 2-mercaptopyridine} to group eleven centres is reported for the first time. The coordination of this hybrid ligand to copper(I) and silver(I) centres in the presence of triphenylphosphine and trialkylphosphine co-ligands has been investigated. The trialkylphosphines coordinates to both copper and silver centres while the less basic triarylphosphine only successfully coordinates to the copper centre. Structural characterisation of [Cu{HB(mt)₂(mp)}(PPh₃)], [Cu{HB(mt)₂(mp)}(PCy₃)] and [Ag{HB(mt)₂(mp)}(PCy₃)] confirm κ³-SSH coordination modes for ligand where one of the mt 'arms' and the mp 'arm' of the scorpionate ligand are coordinated to the metal centre. The second mt 'arm' remains uncoordinated in all three complexes. A comparison has been made with the parent sulfur based scorpionate ligand, [Tm]⁻{HB(mt)₃}.
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Affiliation(s)
- Gareth R Owen
- The School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
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Al-Harbi A, Rong Y, Parkin G. Synthesis and structural characterization of bis and tris(2-mercapto-1-methylbenzimidazolyl)hydroborato complexes: benzannulation promotes κ³-coordination. Dalton Trans 2013; 42:11117-27. [PMID: 23801309 DOI: 10.1039/c3dt51092a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The benzannulated bis and tris(mercaptoimidazolyl)borohydride compounds, [BmMeBenz]Na and [TmMeBenz]Na, have been synthesized via the reactions of NaBH4 with two and three equivalents of 1-methyl-1,3-dihydro-2H-benzimidazole-2-thione, respectively. X-ray diffraction studies on the THF adducts, {μ-[BmMeBenz]Na(THF)₂}₂ and {[TmMeBenz]Na}₂(μ-THF)₃, indicate that both compounds are dinuclear but differ according to the nature of the bridging ligand. Specifically, {μ-[BmMeBenz]Na(THF)₂}₂ possesses bridging [BmMeBenz] ligands and terminal THF ligands, while {[TmMeBenz]Na}₂(μ-THF)₃ possesses terminal [TmMeBenz] ligands and bridging THF ligands. The tris(mercaptoimidazolyl)borohydride ligand of {[TmMeBenz]Na}₂(μ-THF)₃ coordinates in a κ³-manner, which is in marked contrast to the κ²-, κ¹- and κ⁰-modes that have been reported for various [TmMe]Na derivatives. Density functional theory (DFT) geometry optimization calculations of the anions [TmMeBenz]⁻ and [TmMe]⁻ in the gas phase indicate that the conformation required for κ³-S₃ coordination, i.e. one in which the three sulfur donors point away from the B-H group, is relatively more stable for [TmMeBenz]⁻ than for [TmMe]⁻, and thus provides a rationalization for the observation that benzannulation enables κ³-coordination of tris(mercaptoimidazolyl)borohydride ligand in {[TmMeBenz]Na}₂(μ-THF)₃. Furthermore, comparison of the molecular structure and IR spectroscopic properties of [TmMeBenz]Re(CO)₃ with those of [TmMe]Re(CO)₃ indicates that benzannulation reduces the electron donating properties of the ligand, but has little effect on its steric properties. {μ-[BmMeBenz]Na(THF)₂}₂ and {[TmMeBenz]Na}₂(μ-THF)₃ react with [Me₃PCuCl]₄ to give [BmMeBenz]CuPMe₃ and [TmMeBenz]CuPMe₃, the first pair of structurally related bis and tris(mercaptoimidazolyl)hydroborato copper(I) compounds.
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Affiliation(s)
- Ahmed Al-Harbi
- Department of Chemistry, Columbia University, New York, NY 10027, USA
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Imran M, Neumann B, Stammler HG, Monkowius U, Ertl M, Mitzel NW. The versatile behaviour of a novel Janus scorpionate ligand towards sodium, potassium and bismuth(iii) ions. Dalton Trans 2013; 42:15785-95. [DOI: 10.1039/c3dt52030g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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