1
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Mo MY, Wang XJ, Shen RZ, Hu CY, Li XC, Li GW, Liu LT. Enantiospecific Analysis of Carboxylic Acids Using Cinchona Alkaloid Dimers as Chiral Solvating Agents. Anal Chem 2024; 96:7487-7496. [PMID: 38695134 DOI: 10.1021/acs.analchem.4c00053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/15/2024]
Abstract
Cinchona alkaloid derivatives as Brønsted base catalysts have attracted considerable attention in the field of asymmetric catalysis. However, their potential application as chiral solvating agents has not been described. In this research, we investigated the use of the Cinchona alkaloid dimer, namely, (DHQ)2PHAL, as a chiral solvating agent for discerning various mandelic acid derivatives through 1H NMR spectroscopy. The addition of catalytic amounts of DMAP facilitated this process. Our experimental results demonstrate that dimeric (DHQ)2PHAL exhibits remarkable chiral discrimination properties regarding the diagnostic split protons of 1H NMR signals (including 24 examples, up to 0.321 ppm). Furthermore, it serves as an excellent chiral discriminating agent and provides good resolution for racemic chiral phosphoric acid as determined by 31P NMR spectroscopy. The quality of enantiodifferentiation has also been evaluated by means of the parameter "resolution (Rs)". Significantly, this class of CSAs based on (alkaloid)2linker systems with an azaaromatic linker can be directly employed, which is commercially available in an enantiopure form at very low cost and exhibits promising potential in determining the enantiopurity of α-hydroxy acids by chemoselective and biocatalytic reactions.
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Affiliation(s)
- Ming-Yang Mo
- School of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Xiao-Juan Wang
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Ren-Zeng Shen
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Chang-Yan Hu
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Xue-Chun Li
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Gao-Wei Li
- School of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
| | - Lan-Tao Liu
- School of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
- College of Chemistry and Chemical Engineering, Henan Engineering Research Center for Green Synthesis of Pharmaceuticals, Shangqiu Normal University, Shangqiu 476000, China
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García-Romero Á, Waters JE, Jethwa RB, Bond AD, Colebatch AL, García-Rodríguez R, Wright DS. Highly Adaptive Nature of Group 15 Tris(quinolyl) Ligands─Studies with Coinage Metals. Inorg Chem 2023; 62:4625-4636. [PMID: 36883367 DOI: 10.1021/acs.inorgchem.3c00057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
The substitution of heavier, more metallic atoms into classical organic ligand frameworks provides an important strategy for tuning ligand properties, such as ligand bite and donor character, and is the basis for the emerging area of main-group supramolecular chemistry. In this paper, we explore two new ligands [E(2-Me-8-qy)3] [E = Sb (1), Bi (2); qy = quinolyl], allowing a fundamental comparison of their coordination behavior with classical tris(2-pyridyl) ligands of the type [E'(2-py)3] (E = a range of bridgehead atoms and groups, py = pyridyl). A range of new coordination modes to Cu+, Ag+, and Au+ is seen for 1 and 2, in the absence of steric constraints at the bridgehead and with their more remote N-donor atoms. A particular feature is the adaptive nature of these new ligands, with the ability to adjust coordination mode in response to the hard-soft character of coordinated metal ions, influenced also by the character of the bridgehead atom (Sb or Bi). These features can be seen in a comparison between [Cu2{Sb(2-Me-8-qy)3}2](PF6)2 (1·CuPF6) and [Cu{Bi(2-Me-8-qy)3}](PF6) (2·CuPF6), the first containing a dimeric cation in which 1 adopts an unprecedented intramolecular N,N,Sb-coordination mode while in the second, 2 adopts an unusual N,N,(π-)C coordination mode. In contrast, the previously reported analogous ligands [E(6-Me-2-py)3] (E = Sb, Bi; 2-py = 2-pyridyl) show a tris-chelating mode in their complexes with CuPF6, which is typical for the extensive tris(2-pyridyl) family with a range of metals. The greater polarity of the Bi-C bond in 2 results in ligand transfer reactions with Au(I). Although this reactivity is not in itself unusual, the characterization of several products by single-crystal X-ray diffraction provides snapshots of the ligand transfer reaction involved, with one of the products (the bimetallic complex [(BiCl){ClAu2(2-Me-8-qy)3}] (8)) containing a Au2Bi core in which the shortest Au → Bi donor-acceptor bond to date is observed.
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Affiliation(s)
- Álvaro García-Romero
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, Valladolid 47011, Spain
| | - Jessica E Waters
- The Francis Crick Institute, 1 Midland Road, London NW1 1AT, U.K
| | - Rajesh B Jethwa
- Institute of Science and Technology Austria (ISTA), Am Campus 1, Klosterneuburg 3400, Austria
| | - Andrew D Bond
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Annie L Colebatch
- Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, Valladolid 47011, Spain
| | - Dominic S Wright
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
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3
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Peel AJ, Terzopoulos A, Jethwa RB, Choudhury D, Niu HC, Bond AD, Slaughter J, Wright DS. A chiral phosphazane reagent strategy for the determination of enantiomeric excess of amines. Chem Sci 2022; 13:5398-5412. [PMID: 35655560 PMCID: PMC9093139 DOI: 10.1039/d2sc01692c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Accepted: 04/12/2022] [Indexed: 11/21/2022] Open
Abstract
Methods for measuring enantiomeric excess (ee) of organic molecules by NMR spectroscopy provide rapid analysis using a standard technique that is readily available. Commonly this is accomplished by chiral derivatisation of the detector molecule (producing a chiral derivatisation agent, CDA), which is reacted with the mixture of enantiomers under investigation. However, these CDAs have almost exclusively been based on carbon frameworks, which are generally costly and/or difficult to prepare. In this work, a methodology based on the readily prepared inorganic cyclodiphosph(iii)azane CDA ClP(μ-NtBu)2POBorn (Born = endo-(1S)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-yl) is shown to be highly effective in the measurement of ee’s of chiral amines, involving in situ reaction of the chiral amines (R*NH2) with the P–Cl bond of the CDA followed by quaternization of the phosphorus framework with methyl iodide. This results in sharp 31P NMR signals with distinct chemical shift differences between the diastereomers that are formed, which can be used to obtain the ee directly by integration. Spectroscopic, X-ray structural and DFT studies suggest that the NMR chemical shift differences between diastereomers is steric in origin, with the sharpness of these signals resulting from conformational locking of the bornyl group relative to the P2N2 ring induced by the presence of the P(v)-bonded amino group (R*NH). This study showcases cheap inorganic phosphazane CDAs as simple alternatives to organic variants for the rapid determination of ee. The simple inorganic cyclodiphosph(iii)azane chiral derivatisation agent ClP(μ-tBuN)2POBorn (Born = endo-(1S)-1,7,7-trimethylbicyclo[2.2.1]heptan-2-yl) is shown to be effective in the measurement of ee’s of chiral amines using 31P NMR spectroscopy.![]()
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Affiliation(s)
- Andrew J. Peel
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Alexandros Terzopoulos
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Rajesh B. Jethwa
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Dipanjana Choudhury
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Hao-Che Niu
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Andrew D. Bond
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Jonathan Slaughter
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
- The Faraday Institution Quad One, Harwell Science and Innovation Campus, Didcot, UK
| | - Dominic S. Wright
- Yusuf Hamied Department of Chemistry, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
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García-Romero Á, Martín-Álvarez JM, Miguel D, Wright DS, Álvarez CM, García-Rodríguez R. Cation- and Anion-Mediated Supramolecular Assembly of Bismuth and Antimony Tris(3-pyridyl) Complexes. Inorg Chem 2021; 60:19206-19218. [PMID: 34882394 PMCID: PMC8693195 DOI: 10.1021/acs.inorgchem.1c03004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
The use of antimony
and bismuth in supramolecular chemistry has
been largely overlooked in comparison to the lighter elements of Group
15, and the coordination chemistry of the tripodal ligands [Sb(3-py)3] and [Bi(3-py)3] (L) containing the heaviest p-block
element bridgehead atoms has been unexplored. We show that these ligands
form a common hybrid metal–organic framework (MOF) structure
with Cu(I) and Ag(I) (M) salts of weakly coordinating anions (PF6–, SbF6–, and
OTf–), composed of a cationic substructure of rhombic
cage (M)4(L)4 units linked by Sb/Bi–M
bonding. The greater Lewis acidity of Bi compared to Sb can, however,
allows anion···Bi interactions to overcome Bi–metal
bonding in the case of BF4–, leading
to collapse of the MOF structure (which is also seen where harder
metals like Li+ are employed). This study therefore provides
insight into the way in which the electronic effects of the bridgehead
atom in these ligand systems can impact their supramolecular chemistry. The Lewis acidity of the Group 15 bridgehead
atoms (E =
Sb vs Bi) proves to be a decisive structural directing factor in the
coordination of tris(3-pyridyl) ligands E(3-py)3, being
responsible for promoting or disfavoring E−metal or E···anion
interactions.
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Affiliation(s)
- Álvaro García-Romero
- GIR MIOMeT-IU, Cinquima, Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Jose M Martín-Álvarez
- GIR MIOMeT-IU, Cinquima, Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Daniel Miguel
- GIR MIOMeT-IU, Cinquima, Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Dominic S Wright
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Celedonio M Álvarez
- GIR MIOMeT-IU, Cinquima, Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU, Cinquima, Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
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5
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Waters JE, Hanf S, Rincón-Nocito M, Bond AD, García-Rodríguez R, Wright DS, Colebatch AL. Synthesis and coordination behaviour of aluminate-based quinolyl ligands. Dalton Trans 2021; 50:14551-14559. [PMID: 34698325 DOI: 10.1039/d1dt02438h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effects of moving the donor N-atom from the 2-position in lithium (2-pyridyl)- and (2-quinolyl)aluminates to the more remote position in (8-quinolyl)aluminates have been investigated by solid-state structural and DFT computational studies of the new complexes [{EtAl(2-qy)3}Li(μ-X)Li(THF)3] (X = Cl/Br 62 : 38) [(1)Li(μ-X)Li(THF)3], [{(EtAl(2-qy)3)Li}2(μ-Br)]-Li(THF)4+ [{1Li}2(μ-Br)]-Li(THF)4+, [{EtAl(2-Me-8-qy)3}Li] [(2)Li], [{Me2Al(2-Me-8-qy)2}Li(THF)] [(3a)Li(THF)], [{Me2Al(6-Me-2-py)2}Li(THF)2] [(4)Li(THF)2] and [{{EtAl(2-Me-8-qy)2}2O}(Li2THF)] (5). Increasing the remoteness of the donor N-atom from the bridgehead results in large differences in the coordination of the Li+ cations by the (8-quinolyl)aluminate anions compared to 2-quinolyl or 2-pyridyl counterparts. The results are of potential interest in understanding how the coordination sites of ligands of this type can be tuned for the coordination requirements of specific metal centres.
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Affiliation(s)
- Jessica E Waters
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
| | - Schirin Hanf
- Karlsruhe Institut für Technologie (KIT), 76131 Karlsruhe, Baden-Württemberg, Germany
| | - Marina Rincón-Nocito
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
| | - Andrew D Bond
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
| | - Raul García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química, Inorgunica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Dominic S Wright
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
| | - Annie L Colebatch
- Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia.
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6
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García-Romero Á, Martín-Álvarez JM, Colebatch AL, Plajer AJ, Miguel D, Álvarez CM, García-Rodríguez R. Synthesis of tris(3-pyridyl)aluminate ligand and its unexpected stability against hydrolysis: revealing cooperativity effects in heterobimetallic pyridyl aluminates. Dalton Trans 2021; 50:13059-13065. [PMID: 34581366 DOI: 10.1039/d1dt02351a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We report the elusive metallic anion [EtAl(3-py)3]- (3-py = 3-pyridyl) (1), the first member of the anionic tris(3-pyridyl) family. Unexpectedly, the lithium complex 1Li shows substantial protic stability against water and alcohols, unlike related tris(2-pyridyl)aluminate analogues. This stability appears to be related to the inability of the [EtAl(3-py)3]- anion to chelate Li+, which precludes a decomposition pathway involving Li/Al cooperativity.
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Affiliation(s)
- Álvaro García-Romero
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid; Campus Miguel Delibes, 47011 Valladolid, Spain.
| | - Jose M Martín-Álvarez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid; Campus Miguel Delibes, 47011 Valladolid, Spain.
| | - Annie L Colebatch
- Chemistry Department. Cambridge University, Lensfield Road, Cambridge CB2 1EW, UK.,Research School of Chemistry. Australian National University, Canberra, ACT, 2601, Australia
| | - Alex J Plajer
- Chemical Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK
| | - Daniel Miguel
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid; Campus Miguel Delibes, 47011 Valladolid, Spain.
| | - Celedonio M Álvarez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid; Campus Miguel Delibes, 47011 Valladolid, Spain.
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid; Campus Miguel Delibes, 47011 Valladolid, Spain.
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Waters JE, Berger G, Peel AJ, García-Rodríguez R, Bond AD, Wright DS. Uncovering the Hidden Landscape of Tris(4-pyridyl) Ligands: Topological Complexity Derived from the Bridgehead. Chemistry 2021; 27:12036-12040. [PMID: 34128570 DOI: 10.1002/chem.202101291] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2021] [Indexed: 11/09/2022]
Abstract
Supramolecular main group chemistry is a developing field which parallels the conventional domain of metallo-organic chemistry. Little explored building blocks in this area are main group metal-based ligands which have the appropriate donor symmetry to build desired molecular or extended arrangements. Tris(pyridyl) main group ligands (E(py)3 , E=main group metal) are potentially highly versatile building blocks since shifting the N-donor arms from the 2- to the 3-positions and 4-positions provides a very simple way of changing the ligand character from mononuclear/chelating to multidentate/metal-bridging. Here, the coordination behaviour of the first main group metal tris(4-pyridyl) ligands, E(4-py)3 (E=Sb, Bi, Ph-Sn) is explored, as well as their ability to build metal-organic frameworks (MOFs). The complicated topology of these MOFs shows a marked influence on the counter anion and on the ability of the E(4-py)3 ligands to switch coordination mode, depending on the steric and donor character of the bridgehead. This structure-directing influence of the bridgehead provides a potential building strategy for future molecular and MOF design in this area.
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Affiliation(s)
- Jessica E Waters
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Georg Berger
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.,Anorganisch-Chemisches Institut, Heidelberg University, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Andrew J Peel
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Raúl García-Rodríguez
- GIR MIOMeT, IU CINQUIMA/Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, E-47011, Valladolid, Spain
| | - Andrew D Bond
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Dominic S Wright
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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8
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Plajer AJ, Crusius D, Jethwa RB, García-Romero Á, Bond AD, García-Rodríguez R, Wright DS. Coordination chemistry of the bench-stable tris-2-pyridyl pnictogen ligands [E(6-Me-2-py) 3] (E = As, As[double bond, length as m-dash]O, Sb). Dalton Trans 2021; 50:2393-2402. [PMID: 33291126 DOI: 10.1039/d0dt03732j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Tripodal ligands with main group bridghead units are well established in coordination chemistry and single-site organometallic catalysis. Although a large number of tris(2-pyridyl) main group ligands [E(2-py)3] (E = main group element, 2-py = 2-pyridyl) spanning across the whole p-block are now synthetically acessible, only limited work has been done on the coordination chemistry on the tris(2-pyridyl) group 15 ligands for the heavier elements (As, Sb). In the current study we investigate the coordination chemistry of the ligand family E(6-Me-2-py)3 (E = As, Sb) and of the As(v) ligand O[double bond, length as m-dash]As(6-Me-2-py)3. The air- and mositure-stability of all of these main group ligands makes them especially attractive in future catalytic applications.
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Affiliation(s)
- Alex J Plajer
- Chemistry Department, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, UK
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9
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Peel AJ, Waters JE, Plajer AJ, García-Rodríguez R, Wright DS. Recent advances in the synthesis and application of tris(pyridyl) ligands containing metallic and semimetallic p-block bridgeheads. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2021. [DOI: 10.1016/bs.adomc.2021.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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10
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García-Romero Á, Plajer AJ, Miguel D, Wright DS, Bond AD, Álvarez CM, García-Rodríguez R. Tris(2-pyridyl) Bismuthines: Coordination Chemistry, Reactivity, and Anion-Triggered Pyridyl Coupling. Inorg Chem 2020; 59:7103-7116. [DOI: 10.1021/acs.inorgchem.0c00579] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Álvaro García-Romero
- GIR MIOMeT-IU, Cinquima, Quı́mica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Alex J. Plajer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Daniel Miguel
- GIR MIOMeT-IU, Cinquima, Quı́mica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Dominic S. Wright
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Andrew D. Bond
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Celedonio M. Álvarez
- GIR MIOMeT-IU, Cinquima, Quı́mica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU, Cinquima, Quı́mica Inorgánica, Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011 Valladolid, Spain
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11
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Zeckert K, Fuhrmann D. Bis(2-pyridyl) and Tris(2-pyridyl) Compounds of Gallium and Indium via a Redox-Transmetalation Route. Inorg Chem 2019; 58:16736-16742. [DOI: 10.1021/acs.inorgchem.9b02872] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kornelia Zeckert
- Institut für Anorganische Chemie, Fakultät für Chemie und Mineralogie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
| | - Daniel Fuhrmann
- Institut für Anorganische Chemie, Fakultät für Chemie und Mineralogie, Universität Leipzig, Johannisallee 29, 04103 Leipzig, Germany
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12
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Yang ES, Plajer AJ, García-Romero Á, Bond AD, Ronson TK, Álvarez CM, García-Rodríguez R, Colebatch AL, Wright DS. A Tris(3-pyridyl)stannane as a Building Block for Heterobimetallic Coordination Polymers and Supramolecular Cages. Chemistry 2019; 25:14003-14009. [PMID: 31469199 DOI: 10.1002/chem.201903498] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Indexed: 11/07/2022]
Abstract
The systematic assembly of supramolecular arrangements is a persistent challenge in modern coordination chemistry, especially where further aspects of complexity are concerned, as in the case of large molecular mixed-metal arrangements. One targeted approach to such heterometallic complexes is to engineer metal-based donor ligands of the correct geometry to build 3D arrangements upon coordination to other metals. This simple idea has, however, only rarely been applied to main group metal-based ligand systems. Here, we show that the new, bench-stable tris(3-pyridyl)stannane ligand PhSn(3-Py)3 (3-Py=3-pyridyl) provides simple access to a range of heterometallic SnIV /transition metal complexes, and that the presence of weakly coordinating counter anions can be used to build discrete molecular arrangements involving anion encapsulation. This work therefore provides a building strategy in this area, which parallels that of supramolecular transition metal chemistry.
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Affiliation(s)
- Eric S Yang
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Alex J Plajer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Álvaro García-Romero
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel, Delibes, 47011, Valladolid, Spain
| | - Andrew D Bond
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Tanya K Ronson
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Celedonio M Álvarez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel, Delibes, 47011, Valladolid, Spain
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel, Delibes, 47011, Valladolid, Spain
| | - Annie L Colebatch
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.,Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Dominic S Wright
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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13
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Robertson SD, Uzelac M, Mulvey RE. Alkali-Metal-Mediated Synergistic Effects in Polar Main Group Organometallic Chemistry. Chem Rev 2019; 119:8332-8405. [DOI: 10.1021/acs.chemrev.9b00047] [Citation(s) in RCA: 122] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Stuart D. Robertson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, U.K
| | - Marina Uzelac
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, U.K
| | - Robert E. Mulvey
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, U.K
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14
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Plajer AJ, Kopf S, Colebatch AL, Bond AD, Wright DS, García-Rodríguez R. Deprotonation, insertion and isomerisation in the post-functionalisation of tris-pyridyl aluminates. Dalton Trans 2019; 48:5692-5697. [DOI: 10.1039/c9dt00869a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of aluminate anions [EtAl(6-R-2-py)3]−(6-R-2-py = 6-R-2-pyridyl, R = Me or Br) with aldehydes (RCHO) or carboxylic acids (RCO2H) reveal how these species can be used to sense chirality and show a new aspect of isomerism in this area.
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Affiliation(s)
- Alex J. Plajer
- Chemistry Department. Cambridge University
- Cambridge CB2 1EW
- UK
| | - Sara Kopf
- Chemistry Department. Cambridge University
- Cambridge CB2 1EW
- UK
| | | | - Andrew D. Bond
- Chemistry Department. Cambridge University
- Cambridge CB2 1EW
- UK
| | | | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias
- Universidad de Valladolid
- Campus Miguel
- Delibes
- 47011 Valladolid
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15
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García‐Romero Á, Plajer AJ, Álvarez‐Miguel L, Bond AD, Wright DS, García‐Rodríguez R. Postfunctionalization of Tris(pyridyl) Aluminate Ligands: Chirality, Coordination, and Supramolecular Chemistry. Chemistry 2018; 24:17019-17026. [DOI: 10.1002/chem.201803342] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 08/08/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Álvaro García‐Romero
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de CienciasUniversidad de Valladolid, Campus Miguel Delibes 47011 Valladolid Spain
| | - Alex J. Plajer
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Lucía Álvarez‐Miguel
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de CienciasUniversidad de Valladolid, Campus Miguel Delibes 47011 Valladolid Spain
| | - Andrew D. Bond
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Dominic S. Wright
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Raúl García‐Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de CienciasUniversidad de Valladolid, Campus Miguel Delibes 47011 Valladolid Spain
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16
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Plajer AJ, Colebatch AL, Rizzuto FJ, Pröhm P, Bond AD, García‐Rodríguez R, Wright DS. How Changing the Bridgehead Can Affect the Properties of Tripodal Ligands. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201802350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alex J. Plajer
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Annie L. Colebatch
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Felix J. Rizzuto
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Patrick Pröhm
- Institut fuer Chemie und BiochemieFreie Universitaet Berlin Fabeckstr. 34–36 14159 Berlin Germany
| | - Andrew D. Bond
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
| | - Raúl García‐Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de CienciasUniversidad de Valladolid Campus Miguel Delibes 47011 Valladolid Spain
| | - Dominic S. Wright
- Department of ChemistryUniversity of Cambridge Lensfield Road Cambridge CB2 1EW UK
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17
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Plajer AJ, Colebatch AL, Rizzuto FJ, Pröhm P, Bond AD, García-Rodríguez R, Wright DS. How Changing the Bridgehead Can Affect the Properties of Tripodal Ligands. Angew Chem Int Ed Engl 2018; 57:6648-6652. [PMID: 29603844 DOI: 10.1002/anie.201802350] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Indexed: 11/08/2022]
Abstract
Although a multitude of studies have explored the coordination chemistry of classical tripodal ligands containing a range of main-group bridgehead atoms or groups, it is not clear how periodic trends affect ligand character and reactivity within a single ligand family. A case in point is the extensive family of neutral tris-2-pyridyl ligands E(2-py)3 (E=C-R, N, P), which are closely related to archetypal tris-pyrazolyl borates. With the 6-methyl substituted ligands E(6-Me-2-py)3 (E=As, Sb, Bi) in hand, the effects of bridgehead modification alone on descending a single group in the periodic table were assessed. The primary influence on coordination behaviour is the increasing Lewis acidity (electropositivity) of the bridgehead atom as Group 15 is descended, which not only modulates the electron density on the pyridyl donor groups but also introduces the potential for anion selective coordination behaviour.
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Affiliation(s)
- Alex J Plajer
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Annie L Colebatch
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Felix J Rizzuto
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Patrick Pröhm
- Institut fuer Chemie und Biochemie, Freie Universitaet Berlin, Fabeckstr. 34-36, 14159, Berlin, Germany
| | - Andrew D Bond
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica Facultad de Ciencias, Universidad de Valladolid, Campus Miguel Delibes, 47011, Valladolid, Spain
| | - Dominic S Wright
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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18
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Seo MS, Jang S, Kim H. A chiral aluminum solvating agent (CASA) for 1H NMR chiral analysis of alcohols at low temperature. Chem Commun (Camb) 2018; 54:6804-6807. [DOI: 10.1039/c8cc00574e] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A chiral aluminum solvating agent (CASA) was demonstrated to be a general and efficient reagent for 1H NMR chiral analysis of alcohols.
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Affiliation(s)
- Min-Seob Seo
- Department of Chemistry
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Korea
| | - Sumin Jang
- Department of Chemistry
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Korea
| | - Hyunwoo Kim
- Department of Chemistry
- Korea Advanced Institute of Science and Technology (KAIST)
- Daejeon 34141
- Korea
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19
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García-Rodríguez R, Kopf S, Wright DS. Modifying the donor properties of tris(pyridyl)aluminates in lanthanide(ii) sandwich compounds. Dalton Trans 2018; 47:2232-2239. [DOI: 10.1039/c7dt04657j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Changing the substituents at the 6-position of the 2-pyridyl groups in the aluminate ligands [EtAl(2-py)3]− has a large electronic and steric effect on their coordination to lanthanide(ii) ions.
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Affiliation(s)
- Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel
- Delibes
- Universidad de Valladolid
| | - Sara Kopf
- Chemistry Department. Cambridge University
- Cambridge CB2 1EW
- U.K
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20
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Plajer AJ, Colebatch AL, Enders M, García-Romero Á, Bond AD, García-Rodríguez R, Wright DS. The coordination chemistry of the neutral tris-2-pyridyl silicon ligand [PhSi(6-Me-2-py)3]. Dalton Trans 2018; 47:7036-7043. [DOI: 10.1039/c8dt01332b] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The first transition metal complexes of Si(iv) tris(2-pyridyl) ligands are reported.
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Affiliation(s)
- Alex J. Plajer
- Chemistry Department. Cambridge University
- Cambridge CB2 1EW
- UK
| | | | - Markus Enders
- Anorganisch-Chemisches Institut
- Heidelberg University
- 69120 Heidelberg
- Germany
| | - Álvaro García-Romero
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel
- Delibes
- Universidad de Valladolid
| | - Andrew D. Bond
- Chemistry Department. Cambridge University
- Cambridge CB2 1EW
- UK
| | - Raúl García-Rodríguez
- GIR MIOMeT-IU Cinquima-Química Inorgánica
- Facultad de Ciencias
- Campus Miguel
- Delibes
- Universidad de Valladolid
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