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Mobian P, Pham DJ, Chaumont A, Barloy L, Khalil G, Kyritsakas N. Circular Heterochiral Titanium-Based Self-Assembled Architectures. J Am Chem Soc 2024; 146:14067-14078. [PMID: 38728688 DOI: 10.1021/jacs.4c02352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
Circular trinuclear helicates have been synthesized from a bis-biphenol strand (LH4), titanium isopropoxide, and various diimine ligands. These self-assembled architectures constructed around three TiO4N2 nodes have a heterochiral structure (C1 symmetry) when 2,2'-bipyridine (A), 4,4'-dimethyl-2,2'-bipyridine (B), 4,4'-bromo-2,2'-bipyridine (C), or 4,4'-dimethyl-2,2'-bipyrimidine (D) is employed. Within these complexes, one nitrogen ligand is endo-positioned inside the metallo-macrocycle, whereas the other two diimine ligands point outside the helicate framework. This investigation highlights that the nitrogen ligand which does not participate in the helicate framework of the complex controls the overall symmetry of the helicate since the 2,2'-bipyrimidine chelate (F) ends in the formation of a homochiral aggregate (C3 symmetry). The lack of symmetry found in the solid state for the trinuclear species ([Ti3L3(B)3], [Ti3L3(C)3], and [Ti3L3(D)3]) is observed for these complexes in solution (dichloromethane or chloroform). Remarkably, the 2,2'-bipyrazine ligand (ligand E) ends in the formation of a hexameric aggregate formulated as [Ti6L6(E)6], whereas the use of 4,4'-dimethyl-2,2'-bipyrimidine (ligand D) permits to generate the dinuclear complexes ([Ti2L(D)2(OiPr)4] and [Ti2L2(D)2]) in addition to the trimeric structure [Ti3L3(D)3]. The behavior of [Ti3L3(A)3] in solution, on the other hand, is unique since an equilibrium between the homochiral and the heterochiral form is reached within 17 days after the complex has been dissolved in dichloromethane (C3-[Ti3L3(A)3]/C1-[Ti3L3(A)3] ratio = 0.3). In chloroform, the heterochiral form of [Ti3L3(A)3] is stable for the same period of time, evidencing the dependence of this stereochemical transformation toward the solvent medium. The thermodynamic and kinetic parameters linked to this stereochemical equilibrium have been obtained and point to the fact that the transformation is intramolecular and not induced by the presence of external ligands. The thermodynamic constant of the C1-[Ti3L3(A)3]/C3-[Ti3L3(A)3] equilibrium is found to be K = 0.34 ± 10%. Further evidence to rationalize this solvent-induced symmetry switch is obtained via a DFT calculation and classical molecular dynamics. In particular, this computational investigation elucidates the reason why the stereochemical transformation of a heterochiral architecture into a homochiral structure is possible only for a trinuclear assembly containing ligand A.
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Affiliation(s)
- Pierre Mobian
- Université de Strasbourg, CNRS, CMC UMR 7140 (team SFAM), F-67000 Strasbourg, France
| | - David-Jérôme Pham
- Université de Strasbourg, CNRS, CMC UMR 7140 (team SFAM), F-67000 Strasbourg, France
| | - Alain Chaumont
- Université de Strasbourg, CNRS, CMC UMR 7140 (team MSM), F-67000 Strasbourg, France
| | - Laurent Barloy
- Université de Strasbourg, CNRS, CMC UMR 7140 (team SFAM), F-67000 Strasbourg, France
| | - Georges Khalil
- Université de Strasbourg, CNRS, CMC UMR 7140 (team SFAM), F-67000 Strasbourg, France
| | - Nathalie Kyritsakas
- Université de Strasbourg, CNRS, CMC UMR 7140 (team LTM), F-67000 Strasbourg, France
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2
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Krückel T, Schauerte S, Ke J, Schlottmann M, Bausch S, Chen X, Räuber C, Almeida Silva ID, Wiegand T, Albrecht M. 7Li NMR Spectroscopy: A Tool for Determining Dimerization Constants and Averaged Dimerization Constants of the Monomer/Dimer Equilibrium of Hierarchical Helicates. Chemistry 2024; 30:e202400387. [PMID: 38451207 DOI: 10.1002/chem.202400387] [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: 01/29/2024] [Revised: 03/07/2024] [Accepted: 03/25/2024] [Indexed: 03/08/2024]
Abstract
7Li nuclear magnetic resonance (NMR) spectroscopy is an ideal tool to study hierarchically assembled helicates of the form Li[Li3L6Ti2]. Internally bound and external lithium ions can be well distinguished by solution- or solid-state NMR spectroscopy and dimerization constants of the monomer/dimer equilibrium can be easily determined in solution. Averaged dimerization constants can be estimated in case of statistical mixtures of helicates formed from mixtures of ligands.
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Affiliation(s)
- Tobias Krückel
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Steffen Schauerte
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Jinbo Ke
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Marcel Schlottmann
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Sandra Bausch
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Xiaofei Chen
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | - Christoph Räuber
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
| | | | - Thomas Wiegand
- Max-Planck Institut für chemische Energiekonversion, Stiftstr. 34-36, D-45470, Mülheim/Ruhr, Germany
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 2, D-52074, Aachen, Germany
| | - Markus Albrecht
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074, Aachen, Germany
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3
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Fernández-Fariña S, Maneiro M, Zaragoza G, Seco JM, Pedrido R, González-Noya AM. Nickel, copper, and zinc dinuclear helicates: how do bulky groups influence their architecture? Dalton Trans 2024; 53:5676-5685. [PMID: 38445308 DOI: 10.1039/d4dt00279b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
The ligand design factors that may influence the isolation of metallosupramolecular helicates or mesocates still deserve to be investigated. In this sense, dinuclear nickel(II), copper(II) and zinc(II) compounds were obtained by electrochemical synthesis using a family of five Schiff base ligands, H2Ln (n = 1-5), derived from bisphenylmethane and functionalized with bulky tert-butyl groups in the periphery and ethyl groups in the spacer. Six of the new complexes were characterized by X-ray crystallography, thus demonstrating that the helicate structure is predominant in the solid state. 1H NMR studies were performed for the zinc complexes to analyze if the helical architecture of the metal complexes is retained in solution. These studies reveal that the presence of a tert-butyl group in the ortho position with respect to the OH group is an essential factor identified for the existence of a helicate conformation in solution.
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Affiliation(s)
- Sandra Fernández-Fariña
- Departamento de Química Inorgánica, Facultade de Ciencias, Campus Terra, Universidade de Santiago de Compostela, E-27002, Lugo, Spain
| | - Marcelino Maneiro
- Departamento de Química Inorgánica, Facultade de Ciencias, Campus Terra, Universidade de Santiago de Compostela, E-27002, Lugo, Spain
| | - Guillermo Zaragoza
- Unidade de Difracción de Raios X, Edificio CACTUS, Universidade de Santiago de Compostela, Campus Sur, Santiago de Compostela, Galicia, E-15782, Spain
| | - José M Seco
- Departamento de Química Orgánica Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, Santiago de Compostela, Galicia, E-15782, Spain
| | - Rosa Pedrido
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, Santiago de Compostela, Galicia, E-15782, Spain.
| | - Ana M González-Noya
- Departamento de Química Inorgánica, Facultade de Química, Campus Vida, Universidade de Santiago de Compostela, Santiago de Compostela, Galicia, E-15782, Spain.
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4
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Albrecht M. The Monomer-Dimer Equilibrium of Triscatechol Titanium(IV)-Based Hierarchical Helicates as a Tool for the Development of Molecular Balances and Molecular Switches. Acc Chem Res 2023; 56:3271-3281. [PMID: 37955356 DOI: 10.1021/acs.accounts.3c00525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2023]
Abstract
ConspectusHierarchical helicates are formed by noncovalent connection of two or more monomeric metal complex units, e.g., by bridging metal cations. A unique kind of hierarchical helicate is obtained from 3-carbonyl substituted catechol ligands with titanium(IV) ions in the presence of lithium cations. This kind of supramolecular complex shows in solution a "monomer-dimer" equilibrium. There are different possibilities (solvent, countercation, substituents at carbonyl unit, etc.) to shift this equilibrium to either the monomer or the dimer side. Thus, the lithium-bridged catecholate-based hierarchical helicates resemble a molecular switch. In this Account, different aspects are discussed of how this unique behavior of the dimeric titanium catecholates can be used for application.Thorough investigation of the energetics of the monomer-dimer equilibrium leads to a deeper understanding of the thermodynamic and kinetic effects of the dimerization (or dissociation) process. In this context, even weak interaction of substituents in the periphery of the complexes can be observed. Hereby on the one hand, solvent effects have an important influence and can be easily evaluated. The thorough understanding of the behavior of the monomer-dimer equilibrium allows one to develop some novel applications. In this respect, the use of the hierarchical helicate-based switch as a platform for reaction control and catalysis is described. Decent enantioselectivities up to ee = 58% can be found in Diels-Alder reactions in the periphery of the dimers, while switching to the monomer as a reaction platform still allows the cycloaddition reaction but turns the selectivity off. Additionally, it is described that catalytically important units can be introduced and hydrogenation reactions as well as Michael-type reactions are catalyzed at the helicates.Covalent connection of two catechol ester units leads to classical helicates. Depending on the alkaline metal cation, those can be switched from a compressed to an expanded form or vice versa. Hereby the monomer-dimer equilibrium is transformed into a structural switch. The switching process can be initiated by removal or addition of lithium cations (e.g., by addition of [2.1.1]cryptand). Alternative switching possibilities are based in the case of glycol bridged helicates on cation translocation isomerism and with thioester derivatives it occurs spontaneously in DMSO. Introduction of chiral tethers results in a three state switch allowing expansion/compression as well as switching of the helicity.
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Affiliation(s)
- Markus Albrecht
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
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5
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Stimuli-responsive chirality inversion of metallohelices and related dynamic metal complexes. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Helicate versus Mesocate in Quadruple-Stranded Lanthanide Cages: A Computational Insight. Int J Mol Sci 2022; 23:ijms231810619. [PMID: 36142519 PMCID: PMC9504305 DOI: 10.3390/ijms231810619] [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: 08/29/2022] [Revised: 09/09/2022] [Accepted: 09/09/2022] [Indexed: 11/16/2022] Open
Abstract
To drive the synthesis of metallo-supramolecular assemblies (MSAs) and to fully exploit their functional properties, robust computational tools are crucial. The capability to model and to rationalize different parameters that can influence the outcome is mandatory. Here, we report a computational insight on the factors that can determine the relative stability of the supramolecular isomers helicate and mesocate in lanthanide-based quadruple-stranded assemblies. The considered MSAs have the general formula [Ln2L4]2− and possess a cavity suitable to allocate guests. The analysis was focused on three different factors: the ligand rigidity and the steric hindrance, the presence of a guest inside the cavity, and the guest dimension. Three different quantum mechanical calculation set-ups (in vacuum, with the solvent, and with the solvent and the dispersion correction) were considered. Comparison between theoretical and experimental outcomes suggests that all calculations correctly estimated the most stable isomer, while the inclusion of the dispersion correction is mandatory to reproduce the geometrical parameters. General guidelines can be drawn: less rigid and less bulky is the ligand and less stable is the helicate, and the presence of a guest can strongly affect the isomerism leading to an inversion of the stability by increasing the guest size when the ligand is flexible.
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Scarpi-Luttenauer M, Mobian P, Barloy L. Synthesis, structure and functions of discrete titanium-based multinuclear architectures. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214439] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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8
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Kalinke LHG, Rabelo R, Valdo AK, Martins FT, Moliner N, Ferrando-Soria J, Julve M, Lloret F, Cano J, Cangussu D. Trinuclear Cobalt(II) Triple Helicate with a Multidentate Bithiazolebis(oxamate) Ligand as a Supramolecular Nanomagnet. Inorg Chem 2022; 61:5696-5700. [PMID: 35385259 DOI: 10.1021/acs.inorgchem.2c00291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The cobalt(II)-mediated self-assembly of the potentially tris(chelating) N,N'-2,2'-(4,4'-bithiazole)bis(oxamate) (dabtzox) ligand gives a new metal-organic supramolecular nanomagnet of formula K6Co3(dabtzox)3·8H2O·MeOH (1) featuring a unique linear triple-stranded trinuclear structure of the helicate type.
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Affiliation(s)
- Lucas H G Kalinke
- Instituto Federal de Goiás, IFG-Câmpus Anápolis, Anápolis, Goiás 75131-457, Brazil
| | - Renato Rabelo
- Departament de Química Inorgànica, Instituto de Ciencia Molecular, 46980 C/Catedrático José Beltrán 2, Paterna, Valencia 46980, Spain
| | - Ana K Valdo
- Instituto Federal de Educação, Ciência e Tecnologia Goiano, Iporá, Goiás 76200-000, Brazil
| | - Felipe T Martins
- Instituto de Química, Universidade Federal de Goiás, Goiânia, Goiás 74001-970, Brazil
| | - Nicolás Moliner
- Departament de Química Inorgànica, Instituto de Ciencia Molecular, 46980 C/Catedrático José Beltrán 2, Paterna, Valencia 46980, Spain
| | - Jesus Ferrando-Soria
- Departament de Química Inorgànica, Instituto de Ciencia Molecular, 46980 C/Catedrático José Beltrán 2, Paterna, Valencia 46980, Spain
| | - Miguel Julve
- Departament de Química Inorgànica, Instituto de Ciencia Molecular, 46980 C/Catedrático José Beltrán 2, Paterna, Valencia 46980, Spain
| | - Francesc Lloret
- Departament de Química Inorgànica, Instituto de Ciencia Molecular, 46980 C/Catedrático José Beltrán 2, Paterna, Valencia 46980, Spain
| | - Joan Cano
- Departament de Química Inorgànica, Instituto de Ciencia Molecular, 46980 C/Catedrático José Beltrán 2, Paterna, Valencia 46980, Spain
| | - Danielle Cangussu
- Instituto de Química, Universidade Federal de Goiás, Goiânia, Goiás 74001-970, Brazil
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9
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Hewage N, Mastriano C, Brückner C, Zeller M. Bis(catecholato-κ 2 O, O')bis-(dimethyl sulfoxide-κ O)titanium(IV). Acta Crystallogr E Crystallogr Commun 2022; 78:385-391. [PMID: 35492266 PMCID: PMC8983984 DOI: 10.1107/s2056989022002638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 03/08/2022] [Indexed: 11/22/2022]
Abstract
Bis(benzene-1,2-diolato-κ2 O,O')bis-(dimethyl sulfoxide-κO)titanium(IV), [Ti(C6H4O2)2(C2H6OS)2], crystallizes with two crystallographically independent mol-ecules in the space group P21/c emulating ortho-rhom-bic Pbca symmetry (β = 90.0445 (9)°]. The two mol-ecules are related by pseudo-glide symmetry, broken by modulation of each one catecholate and dimethyl sulfoxide (DMSO) ligand. Twinning by pseudomerohedry was observed [twin ratio 0.5499 (7):0.4401 (7)]. Complex 3 was obtained by heating of diprotonated titanium tris-catecholate precursor 2H in DMSO, by formal displacement of a catechol mol-ecule by two DMSO mol-ecules. Complex 3 is just the second heteroleptic, mono-nuclear, neutral bis-catecholate complex with TiO6 metal coordination, the only other one being its bis-DMF analogue 6. The two mol-ecules of 3 exhibit a distorted octa-hedral geometry. The geometry and distortions from ideal symmetry of 3 are discussed and compared to 6 and to cationic tris-catecholate titanium complexes.
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Affiliation(s)
- Nisansala Hewage
- Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060, USA
| | - Carolyn Mastriano
- Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060, USA
| | - Christian Brückner
- Department of Chemistry, University of Connecticut, Storrs, CT 06269-3060, USA
| | - Matthias Zeller
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907-2084, USA
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10
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Okuda S, Ousaka N, Iwata T, Ishida R, Urushima A, Suzuki N, Nagano S, Ikai T, Yashima E. Supramolecular Helical Assemblies of Dirhodium(II) Paddlewheels with 1,4-Diazabicyclo[2.2.2]octane: A Remarkable Substituent Effect on the Helical Sense Preference and Amplification of the Helical Handedness Excess of Metallo-Supramolecular Helical Polymers. J Am Chem Soc 2022; 144:2775-2792. [PMID: 35119857 DOI: 10.1021/jacs.1c12652] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We report unique coordination-driven supramolecular helical assemblies of a series of dirhodium(II) tetracarboxylate paddlewheels bearing chiral phenyl- or methyl-substituted amide-bound m-terphenyl residues with triethylene glycol monomethyl ether (TEG) or n-dodecyl tails through a 1:1 complexation with 1,4-diazabicyclo[2.2.2]octane (DABCO). The chiral dirhodium complexes with DABCO in CHCl3/n-hexane (1:1) form one-handed helical coordination polymers with a controlled propeller chirality at the m-terphenyl groups, which are stabilized by intermolecular hydrogen-bonding networks between the adjacent amide groups at the periphery mainly via a cooperative nucleation-elongation mechanism as supported by circular dichroism (CD), vibrational CD, and variable-temperature (VT) absorption and CD analyses. The VT visible-absorption titrations revealed the temperature-dependent changes in the degree of polymerization. The columnar supramolecular helical structures were elucidated by X-ray diffraction and atomic force microscopy. The helix sense of the homopolymer carrying the bulky phenyl and n-dodecyl substituents is opposite those of other chiral homopolymers despite having the same absolute configuration at the pendants. A remarkably strong "sergeants and soldiers" (S&S) effect was observed in most of the chiral/achiral copolymers, while the copolymers of the bulky chiral phenyl-substituted dirhodium complexes with n-dodecyl chains displayed an "abnormal" S&S effect accompanied by an inversion of the helix sense, which could be switched to a "normal" S&S effect by changing the solvent composition. A nonracemic dirhodium complex of 20% enantiomeric excess bearing the less bulky chiral methyl substituents with n-dodecyl chains assembled with DABCO to form an almost one-handed helix (the "majority rule" (MR) effect), whereas the three other nonracemic copolymers showed a weak MR effect.
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Affiliation(s)
- Shogo Okuda
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Naoki Ousaka
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.,Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Takuya Iwata
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Riku Ishida
- Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Akio Urushima
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Nozomu Suzuki
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Shusaku Nagano
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Tomoyuki Ikai
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan.,Department of Molecular Design and Engineering, Graduate School of Engineering, Nagoya University, Chikusa-ku, Nagoya 464-8603, Japan
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11
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Mevissen C, Sommer D, Vasanthakumar S, Truong KN, Rissanen K, Albrecht M. Cation-translocation based isomerism offers a tool for the expansion of compressed helicates. Dalton Trans 2021; 50:9372-9375. [PMID: 34124723 DOI: 10.1039/d1dt01707a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of compressed M[Li313Ti2] (M = Li, Na, K, Rb, Cs) and expanded helicates M4[13Ti2] has been obtained. The helicates Li3[M13Ti2] or M4[13Ti2] with M = Na+, K+, Rb+, or Cs+ adopt the expanded structure in solution. By crystallization the compressed structures M[Li313Ti2] (M = Na, Rb) are obtained. This represents an example of cation-translocation based isomerism.
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Affiliation(s)
- Christian Mevissen
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - David Sommer
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Sabarina Vasanthakumar
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Khai-Nghi Truong
- University of Jyvaskyla, Department of Chemistry, P.O. Box 35, Survontie 9 B, 40014 Jyväskylä, Finland
| | - Kari Rissanen
- University of Jyvaskyla, Department of Chemistry, P.O. Box 35, Survontie 9 B, 40014 Jyväskylä, Finland
| | - Markus Albrecht
- Institut für Organische Chemie, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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12
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Lisboa LS, Riisom M, Vasdev RAS, Jamieson SMF, Wright LJ, Hartinger CG, Crowley JD. Cavity-Containing [Fe 2L 3] 4+ Helicates: An Examination of Host-Guest Chemistry and Cytotoxicity. Front Chem 2021; 9:697684. [PMID: 34307299 PMCID: PMC8292671 DOI: 10.3389/fchem.2021.697684] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 06/16/2021] [Indexed: 02/04/2023] Open
Abstract
Two new di(2,2′-bipyridine) ligands, 2,6-bis([2,2′-bipyridin]-5-ylethynyl)pyridine (L1) and bis(4-([2,2′-bipyridin]-5-ylethynyl)phenyl)methane (L2) were synthesized and used to generate two metallosupramolecular [Fe2(L)3](BF4)4 cylinders. The ligands and cylinders were characterized using elemental analysis, electrospray ionization mass spectrometry, UV-vis, 1H-, 13C and DOSY nuclear magnetic resonance (NMR) spectroscopies. The molecular structures of the [Fe2(L)3](BF4)4 cylinders were confirmed using X-ray crystallography. Both the [Fe2(L1)3](BF4)4 and [Fe2(L2)3](BF4)4 complexes crystallized as racemic (rac) mixtures of the ΔΔ (P) and ΛΛ (M) helicates. However, 1H NMR spectra showed that in solution the larger [Fe2(L2)3](BF4)4 was a mixture of the rac-ΔΔ/ΛΛ and meso-ΔΛ isomers. The host-guest chemistry of the helicates, which both feature a central cavity, was examined with several small drug molecules. However, none of the potential guests were found to bind within the helicates. In vitro cytotoxicity assays demonstrated that both helicates were active against four cancer cell lines. The smaller [Fe2(L1)3](BF4)4 system displayed low μM activity against the HCT116 (IC50 = 7.1 ± 0.5 μM) and NCI-H460 (IC50 = 4.9 ± 0.4 μM) cancer cells. While the antiproliferative effects against all the cell lines examined were less than the well-known anticancer drug cisplatin, their modes of action would be expected to be very different.
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Affiliation(s)
- Lynn S Lisboa
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Mie Riisom
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand.,Auckland Cancer Society Research Centre, University of Auckland, Auckland, New Zealand
| | - Roan A S Vasdev
- Department of Chemistry, University of Otago, Dunedin, New Zealand
| | - Stephen M F Jamieson
- Auckland Cancer Society Research Centre, University of Auckland, Auckland, New Zealand
| | - L James Wright
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | | | - James D Crowley
- Department of Chemistry, University of Otago, Dunedin, New Zealand
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13
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Do JL, Titi HM, Cuccia LA, Friščić T. A new class of anionic metallohelicates based on salicylic and terephthalic acid units, accessible in solution and by mechanochemistry. Chem Commun (Camb) 2021; 57:5143-5146. [PMID: 33899844 DOI: 10.1039/d0cc08180a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a new class of anionic metallohelicates based on an abundant, industrially relevant salicylic acid derivative, leading to discrete double and triple-stranded architectures based on divalent and trivalent metals (Cu2+, Fe3+, respectively). The ability to assemble the metallohelicates in a solvent-free environment presents the opportunity to develop an inexpensive and environmentally-friendly design of helicate materials.
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Affiliation(s)
- Jean-Louis Do
- Department of Chemistry and Biochemistry, FRQNT Quebec Centre for Advanced Materials (QCAM/CQMF), Concordia University, 7141 Sherbrooke St. West, Montreal, Quebec H4B 1R6, Canada. and Department of Chemistry and FRQNT Quebec Centre for Advanced Materials (QCAM/CQMF), McGill University, 801 Sherbrooke St. West, Montreal H3A 0B8, Quebec, Canada.
| | - Hatem M Titi
- Department of Chemistry and FRQNT Quebec Centre for Advanced Materials (QCAM/CQMF), McGill University, 801 Sherbrooke St. West, Montreal H3A 0B8, Quebec, Canada.
| | - Louis A Cuccia
- Department of Chemistry and Biochemistry, FRQNT Quebec Centre for Advanced Materials (QCAM/CQMF), Concordia University, 7141 Sherbrooke St. West, Montreal, Quebec H4B 1R6, Canada.
| | - Tomislav Friščić
- Department of Chemistry and FRQNT Quebec Centre for Advanced Materials (QCAM/CQMF), McGill University, 801 Sherbrooke St. West, Montreal H3A 0B8, Quebec, Canada.
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14
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Hamada Y, Tokoro Y, Oyama T. Chiral Self‐Sorting of Diformylated
N
‐Hetero‐
ortho
‐phenylene Hexamers by Macrocyclization with Aromatic Diamines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yoshihiro Hamada
- Department of Advanced Chemistry Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan
| | - Yuichiro Tokoro
- Department of Applied Chemistry School of Applied Science National Defense Academy of Japan 1-10-20 Hashirimizu Yokosuka Kanagawa 239-8686 Japan
| | - Toshiyuki Oyama
- Department of Advanced Chemistry Faculty of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan
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15
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Morozumi T, Matsuoka R, Nakamura T, Nabeshima T. Solvent-dependent fac/ mer-isomerization and self-assembly of triply helical complexes bearing a pivot part. Chem Sci 2021; 12:7720-7726. [PMID: 34168824 PMCID: PMC8188510 DOI: 10.1039/d1sc01529j] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Tris-chelate metal complexes of unsymmetrical bidentate ligands can form two geometric stereoisomers, facial (fac) and meridional (mer) isomers. Due to the small difference in their properties, the highly-selective synthesis of one of the isomers is challenging. We now designed a series of tripodal ligands with a tris(3-(2-(methyleneoxy)ethoxy)phenyl)methane pivot. Surprisingly, the ratio of the fac/mer isomers of the triply helical FeII complexes significantly changed depending on the solvents. To the best of our knowledge, this is the first example of fac/mer isomerism of a labile tris(2,2'-bipyridine) FeII complex governed by the solvent. Furthermore, well-defined self-assemblies were quantitatively produced by imine bond formation with a suitable diamine. The supramolecular assemblies contained only the fac isomer even though a mixture of the two isomers existed in solution before the condensation reaction. Namely, the self-assembly formation effectively adjusted the geometries of the building unit that results in the suitable supramolecular structure.
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Affiliation(s)
- Takuma Morozumi
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba 1-1-1 Tennodai, Tsukuba Ibaraki 305-8571 Japan
| | - Ryota Matsuoka
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba 1-1-1 Tennodai, Tsukuba Ibaraki 305-8571 Japan
| | - Takashi Nakamura
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba 1-1-1 Tennodai, Tsukuba Ibaraki 305-8571 Japan
| | - Tatsuya Nabeshima
- Faculty of Pure and Applied Sciences and Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba 1-1-1 Tennodai, Tsukuba Ibaraki 305-8571 Japan
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16
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Hooper CAJ, Cardo L, Craig JS, Melidis L, Garai A, Egan RT, Sadovnikova V, Burkert F, Male L, Hodges NJ, Browning DF, Rosas R, Liu F, Rocha FV, Lima MA, Liu S, Bardelang D, Hannon MJ. Rotaxanating Metallo-supramolecular Nano-cylinder Helicates to Switch DNA Junction Binding. J Am Chem Soc 2020; 142:20651-20660. [DOI: 10.1021/jacs.0c07750] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Catherine A. J. Hooper
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Lucia Cardo
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - James S. Craig
- Physical Sciences for Health Centre, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Lazaros Melidis
- Physical Sciences for Health Centre, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Aditya Garai
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Ross T. Egan
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Viktoriia Sadovnikova
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Florian Burkert
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Louise Male
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Nikolas J. Hodges
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Douglas F. Browning
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Roselyne Rosas
- Aix Marseille Univ, CNRS, Centrale Marseille, FSCM, Spectropole, Marseille 13007, France
| | - Fengbo Liu
- The State Key Laboratory of Refractories and Metallurgy, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
| | - Fillipe V. Rocha
- Department of Chemistry, Federal University of São Carlos, São Carlos 13565-905, Brazil
| | - Mauro A. Lima
- Department of Chemistry, Federal University of São Carlos, São Carlos 13565-905, Brazil
| | - Simin Liu
- The State Key Laboratory of Refractories and Metallurgy, School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, P. R. China
| | | | - Michael J. Hannon
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
- Physical Sciences for Health Centre, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
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17
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Giraldi E, Depallens AB, Ortiz D, Fadaei‐Tirani F, Scopelliti R, Severin K. Boronate Ester‐Capped Helicates. Chemistry 2020; 26:7578-7582. [DOI: 10.1002/chem.202001392] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Indexed: 12/30/2022]
Affiliation(s)
- Erica Giraldi
- Institut des Sciences et Ingénierie ChimiquesÉcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Adrien B. Depallens
- Institut des Sciences et Ingénierie ChimiquesÉcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Daniel Ortiz
- Institut des Sciences et Ingénierie ChimiquesÉcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Farzaneh Fadaei‐Tirani
- Institut des Sciences et Ingénierie ChimiquesÉcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Rosario Scopelliti
- Institut des Sciences et Ingénierie ChimiquesÉcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Kay Severin
- Institut des Sciences et Ingénierie ChimiquesÉcole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
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18
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Huang C, Ciesielski A, Samorì P. Molecular Springs: Integration of Complex Dynamic Architectures into Functional Devices. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914931] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Chang‐Bo Huang
- University of StrasbourgCNRSISIS UMR 7006 8 Alleé Gaspard Monge F-67000 Strasbourg France
| | - Artur Ciesielski
- University of StrasbourgCNRSISIS UMR 7006 8 Alleé Gaspard Monge F-67000 Strasbourg France
| | - Paolo Samorì
- University of StrasbourgCNRSISIS UMR 7006 8 Alleé Gaspard Monge F-67000 Strasbourg France
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19
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Huang CB, Ciesielski A, Samorì P. Molecular Springs: Integration of Complex Dynamic Architectures into Functional Devices. Angew Chem Int Ed Engl 2020; 59:7319-7330. [PMID: 31898855 DOI: 10.1002/anie.201914931] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2019] [Indexed: 11/06/2022]
Abstract
Molecular/supramolecular springs are artificial nanoscale objects possessing well-defined structures and tunable physicochemical properties. Like a macroscopic spring, supramolecular springs are capable of switching their nanoscale conformation as a response to external stimuli by undergoing mechanical spring-like motions. This dynamic action offers intriguing opportunities for engineering molecular nanomachines by translating the stimuli-responsive nanoscopic motions into macroscopic work. These nanoscopic objects are reversible dynamic multifunctional architectures which can express a variety of novel properties and behave as adaptive nanoscopic systems. In this Minireview, we focus on the design and structure-property relationships of supramolecular springs and their (self-)assembly as a prerequisite towards the generation of novel dynamic materials featuring controlled movements to be readily integrated into macroscopic devices for applications in sensing, robotics, and the internet of things.
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Affiliation(s)
- Chang-Bo Huang
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 Alleé Gaspard Monge, F-67000, Strasbourg, France
| | - Artur Ciesielski
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 Alleé Gaspard Monge, F-67000, Strasbourg, France
| | - Paolo Samorì
- University of Strasbourg, CNRS, ISIS UMR 7006, 8 Alleé Gaspard Monge, F-67000, Strasbourg, France
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20
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Schlottmann M, Van Craen D, Baums J, Funes-Ardoiz I, Wiederhold C, Oppel IM, Albrecht M. Stability of Hierarchically Formed Titanium(IV) Tris(catecholate ester) Helicates with Cyclohexyl Substituents in DMSO. Inorg Chem 2020; 59:1758-1762. [PMID: 31967799 DOI: 10.1021/acs.inorgchem.9b02988] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A cyclohexyl substituent strongly prefers the chair conformation with large substituents in equatorial positions, while other cycloalkyls are structurally more flexible. In hierarchically formed dimeric titanium(IV) tris(catecholates) equatorial versus axial connection of the cyclohexane to the ester results in either a more compact (axial) or more expanded (equatorial) structure. In DMSO solution the axial position results in a compact structure which minimizes solvophobic effects, leading to higher stability. However, computational investigations indicate that additionally intramolecular London dispersion interactions significantly contribute to the stability of the dimer. Thus, weak side-chain-side-chain interactions are responsible for the high stability of cyclohexyl ester derivatives with axial compared to equatorial ester connection.
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Affiliation(s)
- Marcel Schlottmann
- Institut für Organische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
| | - David Van Craen
- Institut für Organische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
| | - Julia Baums
- Institut für Organische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
| | - Ignacio Funes-Ardoiz
- Institut für Organische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
| | - Constanze Wiederhold
- Institut für Anorganische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
| | - Iris M Oppel
- Institut für Anorganische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
| | - Markus Albrecht
- Institut für Organische Chemie , RWTH Aachen University , Landoltweg 1 , 52074 Aachen , Germany
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21
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Kwamen ACN, Schlottmann M, Van Craen D, Isaak E, Baums J, Shen L, Massomi A, Räuber C, Joseph BP, Raabe G, Göb C, Oppel IM, Puttreddy R, Ward JS, Rissanen K, Fröhlich R, Albrecht M. Shedding Light on the Interactions of Hydrocarbon Ester Substituents upon Formation of Dimeric Titanium(IV) Triscatecholates in DMSO Solution. Chemistry 2020; 26:1396-1405. [PMID: 31737953 PMCID: PMC7027801 DOI: 10.1002/chem.201904639] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Indexed: 01/27/2023]
Abstract
The dissociation of hierarchically formed dimeric triple lithium bridged triscatecholate titanium(IV) helicates with hydrocarbyl esters as side groups is systematically investigated in DMSO. Primary alkyl, alkenyl, alkynyl as well as benzyl esters are studied in order to minimize steric effects close to the helicate core. The 1 H NMR dimerization constants for the monomer-dimer equilibrium show some solvent dependent influence of the side chains on the dimer stability. In the dimer, the ability of the hydrocarbyl ester groups to aggregate minimizes their contacts with the solvent molecules. Due to this, most solvophobic alkyl groups show the highest dimerization tendency followed by alkenyls, alkynyls and finally benzyls. Furthermore, trends within the different groups of compounds can be observed. For example, the dimer is destabilized by internal double or triple bonds due to π-π repulsion. A strong indication for solvent supported London dispersion interaction between the ester side groups is found by observation of an even/odd alternation of dimerization constants within the series of n-alkyls, n-Ω-alkenyls or n-Ω-alkynyls. This corresponds to the interaction of the parent hydrocarbons, as documented by an even/odd melting point alternation.
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Affiliation(s)
- A. Carel N. Kwamen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Marcel Schlottmann
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - David Van Craen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Elisabeth Isaak
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Julia Baums
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Li Shen
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Ali Massomi
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Christoph Räuber
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Benjamin P. Joseph
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Gerhard Raabe
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Christian Göb
- Institut für Anorganische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Iris M. Oppel
- Institut für Anorganische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Rakesh Puttreddy
- University of JyväskyläDepartment of ChemistryP.O. Box 35Jyväskylä40014Finland
| | - Jas S. Ward
- University of JyväskyläDepartment of ChemistryP.O. Box 35Jyväskylä40014Finland
| | - Kari Rissanen
- University of JyväskyläDepartment of ChemistryP.O. Box 35Jyväskylä40014Finland
| | - Roland Fröhlich
- Organisch-Chemisches InstitutUniversität MünsterCorrensstrasse 4048149MünsterGermany
| | - Markus Albrecht
- Institut für Organische ChemieRWTH Aachen UniversityLandoltweg 152074AachenGermany
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22
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Levín P, Escudero D, Díaz N, Oliver A, Lappin AG, Ferraudi G, Lemus L. Structural and Photochemical Properties of Zn(II) Phenanthroline-Derived Complexes: From Mononuclear to Bimetallic and Circular-Trimetallic Helicates. Inorg Chem 2020; 59:1660-1674. [DOI: 10.1021/acs.inorgchem.9b02773] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Pedro Levín
- Facultad de Química y Biología, Departamento de Química de los Materiales, Universidad de Santiago de Chile, Av. Libertador Bernardo O’Higgins, 3363 Estación Central, Santiago, Chile
| | - Dayra Escudero
- Facultad de Química y Biología, Departamento de Química de los Materiales, Universidad de Santiago de Chile, Av. Libertador Bernardo O’Higgins, 3363 Estación Central, Santiago, Chile
| | - Nicolás Díaz
- Facultad de Química y Biología, Departamento de Química de los Materiales, Universidad de Santiago de Chile, Av. Libertador Bernardo O’Higgins, 3363 Estación Central, Santiago, Chile
| | | | | | | | - Luis Lemus
- Facultad de Química y Biología, Departamento de Química de los Materiales, Universidad de Santiago de Chile, Av. Libertador Bernardo O’Higgins, 3363 Estación Central, Santiago, Chile
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23
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Gao SC, Wan K, Fang X, Li YX, Xue M, Yang Y. Determination of association constants and FRET in hydrazide-based molecular duplex strands. Org Chem Front 2020. [DOI: 10.1039/d0qo00746c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The association constants for the hydrazide-based molecular duplex strands can be determined via monitoring the pyrene excimer emission. By mixing pyrene and perylene labelled oligomers, supramolecular substitution reactions induced efficient FRET.
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Affiliation(s)
- Shi-Chang Gao
- School of Science
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Kang Wan
- School of Science
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Xu Fang
- School of Science
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Yong-Xue Li
- School of Science
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Min Xue
- School of Science
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
| | - Yong Yang
- School of Science
- Zhejiang Sci-Tech University
- Hangzhou 310018
- China
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24
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Chen X, Mevissen C, Huda S, Göb C, Oppel IM, Albrecht M. Cation‐Controlled Formation and Interconversion of the
fac
/
fac
and
mer
/
mer
Stereoisomers of a Triple‐Stranded Helicate. Angew Chem Int Ed Engl 2019; 58:12879-12882. [DOI: 10.1002/anie.201904181] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 05/07/2019] [Indexed: 11/07/2022]
Affiliation(s)
- Xiaofei Chen
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Christian Mevissen
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Saskia Huda
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Christian Göb
- Institut für Anorganische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Iris M. Oppel
- Institut für Anorganische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Markus Albrecht
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Germany
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25
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Chen X, Mevissen C, Huda S, Göb C, Oppel IM, Albrecht M. Kationen‐gesteuerte Bildung und Umwandlung der
fac
/
fac
‐ und
mer
/
mer
‐Stereoisomere eines dreisträngigen Helicats. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904181] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Xiaofei Chen
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
| | - Christian Mevissen
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
| | - Saskia Huda
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
| | - Christian Göb
- Institut für Anorganische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
| | - Iris M. Oppel
- Institut für Anorganische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
| | - Markus Albrecht
- Institut für Organische Chemie RWTH Aachen University Landoltweg 1 52074 Aachen Deutschland
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26
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Chen X, Baumert M, Fröhlich R, Albrecht M. Cation triggered spring-like helicates based on ketone-substituted bis-catechol ligands. J INCL PHENOM MACRO 2019. [DOI: 10.1007/s10847-019-00888-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Singh S, Hogue RW, Feltham HLC, Brooker S. Dinuclear helicate and tetranuclear cage assembly using appropriately designed ditopic triazole-azine ligands. Dalton Trans 2019; 48:15435-15444. [DOI: 10.1039/c9dt01890e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Architecture, helicate or cage, is controlled by choice of meta vs. para phenylene linker in new, robust, ditopic triazole-pyrimidine ligands.
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Affiliation(s)
- Sandhya Singh
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| | - Ross W. Hogue
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| | - Humphrey L. C. Feltham
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| | - Sally Brooker
- Department of Chemistry and the MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
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28
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Van Craen D, Schlottmann M, Stahl W, Räuber C, Albrecht M. Kinetic investigation of the dissociation of dinuclear hierarchically assembled titanium( iv) helicates. Dalton Trans 2019; 48:10574-10580. [DOI: 10.1039/c9dt01065c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hierarchically assembled helicates consisting of lithium-bridged triscatecholate titanium(iv) complexes represent a powerful self-assembled supramolecular system with applications as e.g. molecular balances for the evaluation of weak interactions, stereoselectivity switches in asymmetric synthesis or molecular switches.
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Affiliation(s)
- David Van Craen
- Institut für Organische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | | | - Wolfgang Stahl
- Institut für Physikalische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Christoph Räuber
- Institut für Organische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
| | - Markus Albrecht
- Institut für Organische Chemie
- RWTH Aachen University
- 52074 Aachen
- Germany
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