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Weare BL, Hoggett S, Cull WJ, Argent SP, Khlobystov AN, Brown PD. Benzene-1,2,4,5-tetrol. IUCRDATA 2024; 9:x240612. [PMID: 38974847 PMCID: PMC11223686 DOI: 10.1107/s2414314624006126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2024] [Accepted: 06/24/2024] [Indexed: 07/09/2024] Open
Abstract
The crystal structure of the title compound was determined at 120 K. It crystallizes in the triclinic space group P with four independent mol-ecules in the asymmetric unit. In the crystal, each symmetry-unique mol-ecule forms π-π stacks on itself, giving four unique π-π stacking inter-actions. Inter-molecular hydrogen bonding is observed between each pair of independent mol-ecules, where each hy-droxy group can act as a hydrogen-bond donor and acceptor.
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Affiliation(s)
- Benjamin L. Weare
- Nanoscale and Microscale Research Centre, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Sean Hoggett
- School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - William J. Cull
- School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Stephen P. Argent
- School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Andrei N. Khlobystov
- School of Chemistry, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
| | - Paul D. Brown
- Department of Mechanical, Materials, & Manufacturing Engineering, Faculty of Engineering, University of Nottingham, Nottingham, NG7 2RD, United Kingdom
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2
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Radhakrishna L, Sheokand S, Mondal D, Balakrishna MS. Structural Diversity and Rare η 1 Cu-C Interactions in Cu I Complexes of 1,2,3-Triazole-Functionalized Bisphosphines. Inorg Chem 2024; 63:9919-9930. [PMID: 38755737 DOI: 10.1021/acs.inorgchem.4c00951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
This manuscript describes the synthesis of copper complexes of 1,2,3-triazolyl-phosphines: o-Ph2P(C6H4){1,2,3-N3CC6H5)C(PPh2)} (L1), (C6H5){1,2,3-N3C(C6H4(o-PPh2))-C(PPh2)} (L2), 3-Ph2P(C5H3N){1,2,3-N3C(C6H5)C(PPh2)} (L3), o-Ph2P(C6H4){1,2,3-N3C(C5H5N)C(PPh2)} (L4), and {(3,5-Ph2PC6H4-o)21,2,3-N3CCH} (L5). The reactions of L1-L3 with CuI salts afforded dimeric complexes having the general formula [Cu2(μ -X)2L2] (L = L1, X = Cl, Br and I: 1 - 3; L= L2, X = Cl, Br and I: 4- 6; L = L3; X = Cl, Br, and I: 7-9). The reaction of L4 with CuI in a 1:2 molar ratio afforded 1D-coordination polymer [{(CuI)2{o-Ph2P(C6H4){1,2,3-N3C(C5H5N)C(PPh2)}-μ-((k1-N)(k2-P,P))}}]n (10). The reaction of L5 with cuprous halides (CuX) (X = Br, I) yielded mononuclear complexes [CuX{(3,5-Ph2PC6H4-o)21,2,3-N3CCH}-κ2P,P] (X = Br, 12; I, 13). Crystal structures of complexes 12 and 13 showed close interactions between CuI and the triazole C7 carbon. These relatively short Cu···C7 separations may be due to the η1-C interaction (dπ-pπ bond) between the triazolic carbon atom (via pz orbital) and CuI or three-centered two-electron interaction between CuI and the triazolic C-H bond. The existence of the Cu···C interaction was further evinced by the QTAIM analysis in compounds 12 and 13.
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Affiliation(s)
- Latchupatula Radhakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai 400076, India
| | - Sonu Sheokand
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai 400076, India
| | - Dipanjan Mondal
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai 400076, India
| | - Maravanji S Balakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai 400076, India
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3
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Kunchur HS, Sonawane SC, Saini P, Ramakrishnan S, Balakrishna MS. Copper(I) Complexes of Amide Functionalized Bisphosphine: Proximity Enhanced Metal-Ligand Cooperativity and Its Catalytic Advantage in C( sp3)-H Bond Activation of Unactivated Cycloalkanes in Dehydrogenative Carboxylation Reactions. Inorg Chem 2023. [PMID: 38031668 DOI: 10.1021/acs.inorgchem.3c01022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
The reactions of amide functionalized bisphosphine, o-Ph2PC6H4C-(O)N(H)C6H4PPh2-o (1) (BalaHariPhos), with copper salts is described. Treatment of 1 with CuX in a 1:1 molar ratio yielded chelate complexes of the type [CuX{(o-Ph2PC6H4C(O)N(H)C6H4PPh2-o)}-κ2-P,P] (X = Cl, 2; Br, 3; and I, 4), which on subsequent treatment with KOtBu resulted in a dimeric complex [Cu(o-Ph2PC6H4C(O)(N)C6H4PPh2-o)]2 (5). Interestingly, complexes 2-4 showed weak N-H···Cu interactions. These weak H-bonding interactions are studied in detail both experimentally and computationally. Also, CuI complexes 2-5 were employed in the oxidative dehydrogenative carboxylation (ODC) of unactivated cycloalkanes in the presence of carboxylic acids to form the corresponding allylic esters. Among complexes 2-5, halide-free dimeric CuI complex 5 showed excellent metal-ligand cooperativity in the oxidative dehydrogenative carboxylation (ODC) in the presence of carboxylic acids to form the corresponding allylic esters through C(sp3)-H bond activation of unactivated cycloalkanes. Mechanistic details of the catalytic process were established by isolating the precatalyst [Cu{(o-Ph2PC6H4C(O)(NH)C6H4PPh2-o)-κ2-P,P}(OOCPh)] (6) and fully characterized by mass spectrometry, NMR data, and single-crystal X-ray analysis. Density functional theory-based calculations further provided a quantitative understanding of the energetics of a series of H atom transfer steps occurring in the catalytic cycle.
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Affiliation(s)
- Harish S Kunchur
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sachin C Sonawane
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Prateek Saini
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | | | - Maravanji S Balakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Pandey MK, Sonawane SC, Mondal D, Kote BS, Balakrishna MS. Palladium(II) Complexes of (2,6‐Dibenzhydryl‐4‐methylphenyl)diphenyl‐phosphane: Synthesis, Structural Studies, and Catalytic Arylation of Imidazoles Under Aerobic Conditions. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Madhusudan K. Pandey
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Sachin C. Sonawane
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Dipanjan Mondal
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Basvaraj S. Kote
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Maravanji S. Balakrishna
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400076 India
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5
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Mondal D, Balakrishna MS. Recent advances in organophosphorus-chalcogen and organophosphorus-pincer based macrocyclic compounds and their metal complexes. Dalton Trans 2021; 50:6382-6409. [PMID: 34002740 DOI: 10.1039/d1dt00593f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The design and development of phosphorus based macrocycles containing one or more other heteroatoms is of crucial importance for the enhancement of modern synthetic chemistry. In recent years focus on phosphorus based macromolecules has led to intriguing and innovative structures with a variety of applications, including photophysical and host-guest properties, and in organic synthesis. This article summarizes the recent advancements in the synthesis of macrocycles that consist of organophosphorus-chalcogen (P-E, P[double bond, length as m-dash]E; E = O, S, Se) and organophosphorus-pincer based macrocyclic ligands and their transition metal complexes with emphasis given to synthetic methodologies. The reactions involve the modification of simple macrocycles with phosphorus sources or phosphorus-based chalcogenating reagents. Transition metal complexes of phosphine-based macrocyclic pincer ligands and their reactivity are also included.
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Affiliation(s)
- Dipanjan Mondal
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
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Plajer AJ, Bond AD, Wright DS. The Coordination Chemistry of the N-Donor-Substituted Phosphazanes. Chemistry 2021; 27:289-297. [PMID: 32602605 DOI: 10.1002/chem.202002693] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Indexed: 11/12/2022]
Abstract
Phosph(III)azanes, featuring the heterocyclobutane P2 N2 ring, have now been established as building blocks in main-group coordination and supramolecular compounds. Previous studies have largely involved their use as neutral P-donor ligands or as anionic N-donor ligands, derived from deprotonation of amido-phosphazanes [RNHP(μ-NR)]2 . The use of neutral amido-phosphazanes themselves as chelating, H-bond donors in anion receptors has also been an area of recent interest because of the ease by which the proton acidity and anion binding constants can be modulated, by the incorporation of electron-withdrawing exo- and endo-cyclic groups (R) and by the coordination of transition metals to the ring P atoms. We observed recently that the effect of P,N-chelation of metal atoms to the P atoms of cis-[(2-py)NHP(μ-Nt Bu)]2 (2-py=2-pyridyl) not only pre-organises the N-H functionality for optimum H-bonding to anions but also results in a large increase in anion binding constants, well above those for traditional organic receptors like squaramides and ureas. Here, we report a broader investigation of ligand chemistry of [(2-py)NHP(μ-t NBu)]2 (and of the new quinolyl derivative [(8-Qu)NHP(μ-Nt Bu)]2 (8-Qu=8-quinolyl). The additional N-donor functionality of the heterocyclic substituents and its position has a marked effect on the anion and metal coordination chemistry of both species, leading to novel structural behaviour and reactivity compared to unfunctionalized counterparts.
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Affiliation(s)
- Alex J Plajer
- Chemistry Department, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
| | - Andrew D Bond
- Chemistry Department, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
| | - Dominic S Wright
- Chemistry Department, Cambridge University, Lensfield Road, Cambridge, CB2 1EW, United Kingdom
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7
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Kumar S, Balakrishna MS. Synthesis and metal complexes of a tertiary phosphine, 2-(2-(diphenylphosphaneyl)-1H-imidazol-1-yl)pyridine containing pyridyl and imidazole moieties. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114779] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Choe E. Roles and action mechanisms of herbs added to the emulsion on its lipid oxidation. Food Sci Biotechnol 2020; 29:1165-1179. [PMID: 32802555 PMCID: PMC7406613 DOI: 10.1007/s10068-020-00800-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 06/01/2020] [Accepted: 07/13/2020] [Indexed: 12/12/2022] Open
Abstract
Quality of food emulsions is mainly determined by their physicochemical stability such as lipid oxidation, and herbs as antioxidative food materials are added to improve their quality and shelf-life. Despite the extensive researches, the chemistry and implications of herb addition in the lipid oxidation of emulsions are still confusing. This review intended to provide the information on the roles and action mechanisms of herbs in the lipid oxidation of food emulsions, with focuses on polyphenols. Polyphenols act as antioxidants mainly via reactive oxygen species scavenging and metal chelating; however, their oxidation products and reducing capacity to more reactive metal ions increase the lipid oxidation. Factors such as structure, concentration, and distribution determine their anti- or prooxidant role. Interactions, synergism and antagonism, among polyphenol compounds and the effects of tocopherols derived from oil on the antioxidant activity of herbs were also described with the involving action mechanisms.
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Affiliation(s)
- Eunok Choe
- Department of Food and Nutrition, Inha University, 100 Inha-ro, Michuhol-gu, Incheon, 22212 Republic of Korea
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Kumar S, Mague JT, Balakrishna MS. Versatile Coordination Modes of 2,6‐Bis(2‐(diphenylphosphanyl)‐1
H
‐imidazol‐1‐yl)pyridine in Cu(I) and Au(I) Complexes. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000520] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Saurabh Kumar
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay 400076 Mumbai Powai India
| | - Joel T. Mague
- Department of Chemistry Tulane University 70118 New Orleans Louisiana United States
| | - Maravanji S. Balakrishna
- Phosphorus Laboratory Department of Chemistry Indian Institute of Technology Bombay 400076 Mumbai Powai India
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Plajer AJ, Zhu J, Pröhm P, Rizzuto FJ, Keyser UF, Wright DS. Conformational Control in Main Group Phosphazane Anion Receptors and Transporters. J Am Chem Soc 2020; 142:1029-1037. [PMID: 31877039 DOI: 10.1021/jacs.9b11347] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Anion binding by receptor molecules is a central field of modern chemistry which impacts areas of catalysis as well as biological and materials chemistry. As binding often requires high chemical stability under aerobic and aqueous conditions for practical applications, carbon-based anion receptors have dominated this field, with main group element analogues receiving far less attention. The recent observation that the air- and moisture-stable amino-cyclophosph(V)azanes of the type [RN(E)P(μ-NR)]2 (E = O, S, Se) can exhibit halide binding that is competitive with topologically related organic receptors (such as squaramides and thioureas) has motivated us here to explore how the binding properties of phosphazane receptors can be enhanced further. Coordination of transition metals by the two P,N metal coordination sites of the phosph(III)azane dimer [(2-py)NHP(μ-NtBu)]2 not only activates the receptor for anion binding (by fixing the optimum exo-exo conformation and polarizing the endocyclic N-H substituents) but also stabilizes the P2N2 ring to hydrolysis and oxidation. We show how the binding properties of these receptors can be modulated by the coordinated metal fragments and that they can bind chloride 1 to 2 orders of magnitude stronger than the related squaramides and thioureas. These features can be utilized in anion transport through phospholipid bilayers under aqueous conditions for which transport can be improved by 1 order of magnitude compared to the previous best phosphazane and thiourea transporters. This study demonstrates how careful design of inorganic systems can result in potent supramolecular functionality, beyond that observed for organic counterparts.
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Affiliation(s)
- Alex J Plajer
- Chemistry Department , Cambridge University , Lensfield Road , Cambridge CB2 1EW , U.K
| | - Jinbo Zhu
- Cavendish Laboratory, Department of Physics , Cambridge University , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
| | - Patrick Pröhm
- Institut für Chemie und Biochemie , Freie Universitaet Berlin Fabeckstr , 34-36 14159 Berlin , Germany
| | - Felix J Rizzuto
- Department of Chemistry , McGill University , 801 Sherbrooke Street W , Montreal , Quebec H3A 0B8 , Canada
| | - Ulrich F Keyser
- Cavendish Laboratory, Department of Physics , Cambridge University , J. J. Thomson Avenue , Cambridge CB3 0HE , U.K
| | - Dominic S Wright
- Chemistry Department , Cambridge University , Lensfield Road , Cambridge CB2 1EW , U.K
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