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Simons J, Hazra N, Petrunin AV, Crassous JJ, Richtering W, Hohenschutz M. Nonionic Microgels Adapt to Ionic Guest Molecules: Superchaotropic Nanoions. ACS NANO 2024; 18:7546-7557. [PMID: 38417118 DOI: 10.1021/acsnano.3c12357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
Microgels are commonly applied as solute carriers, where the size, density, and functionality of the microgels depend on solute binding. As representatives for ionic solutes with high affinity for the microgel, we study here the effect of superchaotropic Keggin polyoxometalates (POMs) PW12O403- (PW) and SiW12O404- (SiW) on the aqueous swelling and internal structure of nonionic poly(N-isopropylacrylamide) (pNiPAM) microgels by light scattering techniques and small-angle X-ray scattering. Due to their weak hydration, these POMs bind spontaneously to the microgels at millimolar concentrations. The microgels thus become charged and swell at low POM concentration, surprisingly without strongly increasing the volume phase transition temperature, and deswell at higher POM concentration. The swelling arises because of the osmotic pressure of dissociated counterions of the POMs, while the deswelling is due to POMs acting as physical cross-links in the microgels under screened electrostatics in NaCl or excess POM solution. This swelling/deswelling transition is sharper for PW than for SiW related to the lower charge density, weaker hydration, and stronger binding of PW. The POMs elicit qualitatively and quantitatively different swelling effects from ionic surfactants and classical salts. Moreover, the network softness and topology govern the swelling response upon POM binding. The softer the microgel, the stronger is the swelling response, while, inside the microgel, regions of high polymer density swell/contract more upon electric charging/cross-linking than regions with low polymer density. POM binding thus enables fine-tuning of microgel properties and highlights the role of network topology in microgel swelling. Because POMs decompose at an alkaline pH, these POM/microgel systems also exhibit pH-responsive swelling in addition to the typical temperature responsiveness of pNiPAM microgels.
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Affiliation(s)
- Jasmin Simons
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Nabanita Hazra
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Alexander V Petrunin
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Jérôme J Crassous
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
| | - Max Hohenschutz
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, DE-52074 Aachen, Germany
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Zeng M, Chen X, Zhang J. Manipulation of Hierarchical Chiral Self-assembly and Anion Recognition by Supramolecular Systems of β-Glucopyranoside, Pillar[5]arenes, and Polyoxometalates. Chemistry 2023; 29:e202301827. [PMID: 37522265 DOI: 10.1002/chem.202301827] [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: 06/07/2023] [Revised: 07/20/2023] [Accepted: 07/26/2023] [Indexed: 08/01/2023]
Abstract
Hierarchical chiral structures have broad applications in optical devices, asymmetric catalysis, and biological systems. The delicate balance of various interactions are key to the self-assembly of chiral structures. Herein, a ternary co-assembly consisting of cationic pillar[5]arenes (P5As), anionic β-glucopyranoside (βGlcD/βGlcL), and Anderson-type polyoxometalates (POMs) were constructed. Through adjusting the stoichiometry of βGlcD, the assemblies were effectively controlled to form hierarchical nano-leaf assemblies with twisted nanoribbons in a homochiral direction. The co-assemblies exhibit strong Cotton effects, and successfully induced the chirality of Anderson-type POMs. More interestingly, by changing the central metal in Anderson-type POMs (XMo6 O24 3- (X=Cr, Al, and Ga)), even though the three clusters have the same numbers of charge and size, the hierarchical chirality of the related assemblies varied in the morphology of the assemblies and the Cotton effect in the CD spectra. Results in theoretical calculations and ITC titration indicates that the tiny difference in long-range electrostatic interaction would result in the anion recognition of POMs, modulated by βGlcD through host-guest inclusion and hydrogen bonding in the assembly process.
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Affiliation(s)
- Mengyan Zeng
- Beijing National Laboratory for Molecular Science, Key Laboratory of Polymer, Chemistry and Physics of Minister of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
| | - Xin Chen
- Department of Chemistry, Department of Physics, Rutgers University, Newark, New Jersey, 07102, USA
| | - Jie Zhang
- Beijing National Laboratory for Molecular Science, Key Laboratory of Polymer, Chemistry and Physics of Minister of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
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Detecting the Subtle Photo-Responsive Conformational Bistability of Monomeric Azobenzene Functionalized Keggin Polyoxometalates by Using Ion-Mobility Mass Spectrometry. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27123927. [PMID: 35745050 PMCID: PMC9228792 DOI: 10.3390/molecules27123927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/15/2022] [Accepted: 06/16/2022] [Indexed: 12/04/2022]
Abstract
Accurately characterizing the conformational variation of novel molecular assemblies is important but often ignored due to limited characterization methods. Herein, we reported the use of ion-mobility mass spectrometry (IMS/MS) to investigate the conformational changes of four azobenzene covalently functionalized Keggin hybrids (azo-Keggins, compounds 1–4). The as-prepared azo-Keggins showed the general molecular formula of [C16H36N]4[SiW11O40(Si(CH2)3NH–CO(CH2)nO–C6H4N=NC6H4–R)2] (R = H, n = 0 (1); R = NO2, n = 0 (2); R = H, n = 5 (3); R = H, n = 10 (4)). The resultant azo-Keggins maintained stable monomeric states in the gas phase with intact molecular structures. Furthermore, the subtle photo-responsive trans-cis conformational variations of azo-Keggins were clearly revealed by the molecular shape-related collision cross-section value difference ranging from 2.44 Å2 to 6.91 Å2. The longer the alkyl chains linkers were, the larger the conformational variation was. Moreover, for compounds 1 and 2, higher stability in trans-conformation can be observed, while for compounds 3 and 4, bistability can be achieved for both of them.
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Polymeric Surfactant P84/Polyoxometalate α-PW12O403−—A Model System to Investigate the Interplay between Chaotropic and Hydrophobic Effects. COLLOIDS AND INTERFACES 2022. [DOI: 10.3390/colloids6010016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Low charge density nanometric ions were recently shown to bind strongly to neutral hydrated matter in aqueous solution. This phenomenon, called the (super-)chaotropic effect, arises from the partial dehydration of both the nano-ion and the solute, leading to a significant gain in enthalpy. Here, we investigate the chaotropic effect of the polyoxometalate α-PW12O403− on the triblock copolymer P84: (EO)19(PO)43(EO)19 with (EO)19 the polyethoxylated and (PO)43 the polypropoxylated chains. The combination of phase diagrams, spectroscopic (nuclear magnetic resonance) and scattering (small angle neutron/X-ray scattering) techniques revealed that: (i) below the micellization temperature of P84, PW12O403− exclusively binds to the propylene oxide moiety of P84 unimers; and (ii) above the micellization temperature, PW12O403− mostly adsorbs on the ethylene oxide micellar corona. The preferential binding of the PW12O403− to the PPO chain over the PEO chains suggests that the binding is driven by the chaotropic effect and is reinforced by the hydrophobic effect. At higher temperatures, copolymer micellization leads to the displacement of PW12O403− from the PPO chain to the PEO chains. This study deepens our understanding of the subtle interplay between the chaotropic and hydrophobic effects in complex salt-organic matter solutions.
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Santos JL, de Souza GL. Water hydrogen-bonding effects on the ground and low-lying excited states of dipyridyl isomers. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Falaise C, Khlifi S, Bauduin P, Schmid P, Shepard W, Ivanov AA, Sokolov MN, Shestopalov MA, Abramov PA, Cordier S, Marrot J, Haouas M, Cadot E. “Host in Host” Supramolecular Core–Shell Type Systems Based on Giant Ring‐Shaped Polyoxometalates. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202102507] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Clément Falaise
- Institut Lavoisier de Versailles CNRS, UVSQ, Université Paris-Saclay Versailles France
| | - Soumaya Khlifi
- Institut Lavoisier de Versailles CNRS, UVSQ, Université Paris-Saclay Versailles France
| | - Pierre Bauduin
- ICSM, CEA CNRS ENSCM Université Montpellier 34199 Marcoule France
| | - Philipp Schmid
- ICSM, CEA CNRS ENSCM Université Montpellier 34199 Marcoule France
| | - William Shepard
- Synchrotron SOLEIL L'Orme des Merisiers Saint-Aubain BP 48 91192 Gif-sur-Yvette, CEDEX France
| | - Anton A. Ivanov
- Nikolaev Institute of Inorganic Chemistry SB RAS 630090 Novosibirsk Russia
| | - Maxim N. Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS 630090 Novosibirsk Russia
| | | | - Pavel A. Abramov
- Nikolaev Institute of Inorganic Chemistry SB RAS 630090 Novosibirsk Russia
- South Ural State University, Prospekt Lenina, 76 454080 Chelyabinsk Russia
| | - Stéphane Cordier
- CNRS Institut des Sciences Chimiques de Rennes ISCR—UMR 6226 Univ Rennes 35000 Rennes France
| | - Jérôme Marrot
- Institut Lavoisier de Versailles CNRS, UVSQ, Université Paris-Saclay Versailles France
| | - Mohamed Haouas
- Institut Lavoisier de Versailles CNRS, UVSQ, Université Paris-Saclay Versailles France
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles CNRS, UVSQ, Université Paris-Saclay Versailles France
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Xu W, Cao JF, Lin YN, Shu Y, Wang JH. Functionalized polyoxometalate microspheres ensure selective adsorption of phosphoproteins and glycoproteins. Chem Commun (Camb) 2021; 57:3367-3370. [PMID: 33683273 DOI: 10.1039/d1cc00325a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Lacunary polyoxometalate (POM), [PW9O34]9-, grafts with a boronic acid group attached via an organosilane bridge assemble into microspheres, PW9-Si-APBA. The oxygen-rich and hydrophilic surface of POM facilitates the binding of phosphate groups in phosphoproteins and glycans in glycoproteins. While the metal-oxo in POM provides π-π interactions with the phosphate groups of phosphoproteins, the boronic acid group specifically binds to glycoproteins via the cis-diols of glycans. Therefore, these multi-driving forces ensure the selective adsorption of phosphoproteins and glycoproteins by PW9-Si-APBA microspheres in biological sample matrixes, even in the presence of very high protein abundance, i.e., BSA, at mass ratio of β-ca/IgG/OVA/BSA = 1 : 1 : 1 : 200.
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Affiliation(s)
- Wang Xu
- Department of Chemistry, Northeastern University, Box 332, Shenyang 110819, China.
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Falaise C, Khlifi S, Bauduin P, Schmid P, Shepard W, Ivanov AA, Sokolov MN, Shestopalov MA, Abramov PA, Cordier S, Marrot J, Haouas M, Cadot E. "Host in Host" Supramolecular Core-Shell Type Systems Based on Giant Ring-Shaped Polyoxometalates. Angew Chem Int Ed Engl 2021; 60:14146-14153. [PMID: 33724635 DOI: 10.1002/anie.202102507] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Indexed: 11/08/2022]
Abstract
Herein, we show how the chaotropic effect arising from reduced molybdate ions in acidified aqueous solution is able to amplify drastically weak supramolecular interactions. Time-resolved Small Angle X-ray Scattering (SAXS) analysis suggests that molybdenum-blue oligomeric species form huge aggregates in the presence of γ-cyclodextrin (γ-CD) which results in the fast formation of nanoscopic {Mo154 }-based host-guest species, while X-ray diffraction analysis reveals that the ending-point of the scenario results in an unprecedented three-component well-ordered core-shell-like motif. A similar arrangement was found by using preformed hexarhenium chalcogenide-type cluster [Re6 Te8 (CN)6 ]4- as exogenous guest. This seminal work brings better understanding of the self-assembly processes in general and gives new opportunities for practical applications in the design of complex multicomponent materials via the simplicity of the non-covalent chemistry.
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Affiliation(s)
- Clément Falaise
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles, France
| | - Soumaya Khlifi
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles, France
| | - Pierre Bauduin
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, 34199, Marcoule, France
| | - Philipp Schmid
- ICSM, CEA, CNRS, ENSCM, Université Montpellier, 34199, Marcoule, France
| | - William Shepard
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubain BP 48, 91192, Gif-sur-Yvette, CEDEX, France
| | - Anton A Ivanov
- Nikolaev Institute of Inorganic Chemistry SB RAS, 630090, Novosibirsk, Russia
| | - Maxim N Sokolov
- Nikolaev Institute of Inorganic Chemistry SB RAS, 630090, Novosibirsk, Russia
| | | | - Pavel A Abramov
- Nikolaev Institute of Inorganic Chemistry SB RAS, 630090, Novosibirsk, Russia.,South Ural State University, Prospekt Lenina, 76, 454080, Chelyabinsk, Russia
| | - Stéphane Cordier
- CNRS, Institut des Sciences Chimiques de Rennes, ISCR-UMR 6226, Univ Rennes, 35000, Rennes, France
| | - Jérôme Marrot
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles, France
| | - Mohamed Haouas
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles, France
| | - Emmanuel Cadot
- Institut Lavoisier de Versailles, CNRS, UVSQ, Université Paris-Saclay, Versailles, France
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