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Title: Recognition competes with hydration in anion-triggered monolayer formation of cyanostar supra-amphiphiles at aqueous interfaces

Journal Article · · Chemical Science
DOI:https://doi.org/10.1039/D2SC00986B· OSTI ID:1860264

The triggered self-assembly of surfactants into organized layers at aqueous interfaces is important for creating adaptive nanosystems and understanding selective ion extraction. While these transformations require molecular recognition, the underlying driving forces are modified by the local environment in ways that are not well understood. Herein, we investigate the role of ion binding and ion hydration using cyanosurf, which is composed of the cyanostar macrocycle, and its binding to anions that are either size-matched or mis-matched and either weakly or highly hydrated. We utilize the supra-amphiphile concept where anion binding converts cyanosurf into a charged and amphiphilic complex triggering its self-organization into monolayers at the air–water interface. Initially, cyanosurf forms aggregates at the surface of a pure water solution. When the weakly hydrated and size-matched hexafluorophosphate (PF6-) and perchlorate (ClO4-) anions are added, the macrocycles form distinct monolayer architectures. Surface-pressure isotherms reveal significant reorganization of the surface-active molecules upon anion binding while infrared reflection absorption spectroscopy show the ion-bound complexes are well ordered at the interface. Vibrational sum frequency generation spectroscopy shows the water molecules in the interfacial region are highly ordered in response to the charged monolayer of cyanosurf complexes. Consistent with the importance of recognition, we find the smaller mis-matched chloride does not trigger the transformation. However, the size-matched phosphate (H2PO4-) also does not trigger monolayer formation indicating hydration inhibits its interfacial binding. These studies reveal how anion-selective recognition and hydration both control the binding and thus the switching of a responsive molecular interface.

Research Organization:
Indiana Univ., Bloomington, IN (United States); The Ohio State University, Columbus, OH (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
SC0002728; SC0022099; FG02-09ER16068
OSTI ID:
1860264
Alternate ID(s):
OSTI ID: 1904538
Journal Information:
Chemical Science, Journal Name: Chemical Science Vol. 13 Journal Issue: 15; ISSN 2041-6520
Publisher:
Royal Society of Chemistry (RSC)Copyright Statement
Country of Publication:
United Kingdom
Language:
English

References (61)

Arginine–Phosphate Recognition Enhanced in Phospholipid Monolayers at Aqueous Interfaces journal July 2018
Thermodynamic Signatures of the Origin of Anti -Hofmeister Selectivity for Phosphate at Aqueous Interfaces journal May 2020
A Novel Microemulsion Phase Transition: Toward the Elucidation of Third-Phase Formation in Spent Nuclear Fuel Reprocessing journal January 2018
Inchworm movement of two rings switching onto a thread by biased Brownian diffusion represent a three-body problem journal May 2018
Controlling Structure Beyond the Initial Coordination Sphere: Complexation-Induced Reversed Micelle Formation in Calix[4]pyrrole-Containing Diblock Copolymers journal September 2018
Introduction to supra-amphiphiles journal January 2020
The Role of Specific Ion Effects in Ion Transport: The Case of Nitrate and Thiocyanate journal December 2019
The Pivotal Role of Phosphorus in a Resilient Water-Energy-Food Security Nexus journal July 2015
Amphiphilic Building Blocks for Self-Assembly: From Amphiphiles to Supra-amphiphiles journal December 2011
Second-Order Vibrational Lineshapes from the Air/Water Interface journal April 2018
Cu(II) Ion-Responsive Self-Assembly Based on a Water-Soluble Pillar[5]arene and a Rhodamine B-Containing Amphiphile in Aqueous Media journal December 2016
ATR-FTIR spectroscopic studies on aqueous LiClO4, NaClO4, and Mg(ClO4)2 solutions journal January 2004
Molecular dynamics study of structure and vibrational spectra at zwitterionoic lipid/aqueous KCl, NaCl, and CaCl2 solution interfaces journal February 2018
Pillar[6]arene/Paraquat Molecular Recognition in Water: High Binding Strength, pH-Responsiveness, and Application in Controllable Self-Assembly, Controlled Release, and Treatment of Paraquat Poisoning journal November 2012
Comparisons of Indefinite Self-Association Models journal January 1996
25th Anniversary Article: Reversible and Adaptive Functional Supramolecular Materials: “Noncovalent Interaction” Matters journal September 2013
Extraction behavior and third phase formation of neodymium(III) from nitric acid medium in N,N′-dimethyl-N,N′-dioctyl-3-oxadiglcolamide journal October 2018
Structural definition of the BIL and DL: a new universal methodology to rationalize non-linear χ (2) ( ω ) SFG signals at charged interfaces, including χ (3) ( ω ) contributions journal January 2018
Ordering of Interfacial Water Molecules at the Charged Air/Water Interface Observed by Vibrational Sum Frequency Generation journal July 1997
Macrocyclic amphiphiles journal January 2015
Material Evolution with Nanotechnology, Nanoarchitectonics, and Materials Informatics: What will be the Next Paradigm Shift in Nanoporous Materials? journal January 2022
Calix[4]pyrrole:  A New Ion-Pair Receptor As Demonstrated by Liquid−Liquid Extraction journal March 2008
Theoretical Study of Intermolecular Interaction at the Lipid−Water Interface. 1. Quantum Chemical Analysis Using a Reaction Field Theory journal June 1997
Flexibility Coexists with Shape-Persistence in Cyanostar Macrocycles journal March 2016
Specific, multiple-point binding of ATP and AMP to a guanidinium-functionalized monolayer journal December 1991
Aggregation-induced emission journal January 2011
Collaborative routes to clarifying the murky waters of aqueous supramolecular chemistry journal December 2017
Supramolecular amphiphiles journal January 2011
Self-assembly in mesoscopic dimension and artificial supramolecular membranes journal December 2003
Extraction of Zirconium Nitrate by TBP in n -Octane:  Influence of Cation Type on Third Phase Formation According to the “Sticky Spheres” Model journal December 2004
Probing the intermolecular hydrogen bonding of water molecules at the CCl4/water interface in the presence of charged soluble surfactant journal December 1997
Syntheses and evaluation of new hydrophilic azacryptands used as masking agents of technetium in solvent extraction processes journal January 2021
Contact Ion Pair Formation Is Not Necessarily Stronger than Solvent Shared Ion Pairing journal January 2022
Bulk Contributions Modulate the Sum-Frequency Generation Spectra of Water on Model Sea-Spray Aerosols journal July 2018
Ion hydration: Implications for cellular function, polyelectrolytes, and protein crystallization journal February 2006
Global food demand and the sustainable intensification of agriculture journal November 2011
Molecular Recognition and Hydration Energy Mismatch Combine To Inform Ion Binding Selectivity at Aqueous Interfaces journal November 2020
Self-Assembly and Molecular Recognition in Water: Tubular Stacking and Guest-Templated Discrete Assembly of Water-Soluble, Shape-Persistent Macrocycles journal January 2020
Don’t Forget Langmuir–Blodgett Films 2020: Interfacial Nanoarchitectonics with Molecules, Materials, and Living Objects journal June 2020
Smart Nanovehicles Based on pH-Triggered Disassembly of Supramolecular Peptide-Amphiphiles for Efficient Intracellular Drug Delivery journal October 2013
Ion-specific clustering of metal–amphiphile complexes in rare earth separations journal January 2020
Molecular Recognition of Nucleotides by the Guanidinium Unit at the Surface of Aqueous Micelles and Bilayers. A Comparison of Microscopic and Macroscopic Interfaces journal January 1996
The i.r. and Raman spectra of sodium hexafluorophosphate monohydrate, NaPF6·H2O journal January 1977
Controllable Construction of Biocompatible Supramolecular Micelles and Vesicles by Water-Soluble Phosphate Pillar[5,6]arenes for Selective Anti-Cancer Drug Delivery journal June 2016
Construction of self-assembled vesicle nanoenzyme using cucurbit[8]uril-based supra-amphiphiles journal December 2018
Interfacial Supramolecular Structures of Amphiphilic Receptors Drive Aqueous Phosphate Recognition journal April 2019
Shape-Persistent Macrocycles: Structures and Synthetic Approaches from Arylene and Ethynylene Building Blocks journal July 2006
The technological and economic prospects for CO2 utilization and removal journal November 2019
Ionic hydration enthalpies journal September 1977
Phosphate–phosphate oligomerization drives higher order co-assemblies with stacks of cyanostar macrocycles journal January 2018
Molecular Recognition Under Interfacial Conditions: Calix[4]pyrrole-Based Cross-linkable Micelles for Ion Pair Extraction journal June 2017
External Infrared Reflection Absorption Spectrometry of Monolayer Films at the Air-Water Interface journal October 1995
3D and 2D supramolecular assemblies and thermotropic behaviour of a carbo-benzenic mesogen journal January 2017
Surface organization of a DPPC monolayer on concentrated SrCl 2 and ZnCl 2 solutions journal January 2016
Interaction of water with a fatty acid Langmuir film journal April 1998
Supra-Amphiphiles for Functional Assemblies journal September 2016
Supramolecular Amphiphiles: Spontaneous Formation of Vesicles Triggered by Formation of a Charge-Transfer Complex in a Host journal December 2002
Rare earth elements: Mendeleev’s bane, modern marvels journal January 2019
Multifunctional Tricarbazolo Triazolophane Macrocycles: One-Pot Preparation, Anion Binding, and Hierarchical Self-Organization of Multilayers journal November 2015
Self-Assembly and Disassembly of Vesicles as Controlled by Anion-π Interactions journal August 2015
A pentagonal cyanostar macrocycle with cyanostilbene CH donors binds anions and forms dialkylphosphate [3]rotaxanes journal June 2013

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