Tunability by alkali metal cations of photoinduced charge separation in azacrown functionalized graphene

Ballesteros‐Garrido, Rafael; Miguel, Maykel de; Doménech‐Carbó, Antonio; Álvaro, Mercedes; Garcı́a, Hermenegildo

doi:10.1039/c3cc39145k

Cited by 27 publications

(25 citation statements)

References 12 publications

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“…The implications for a new 'host-guest' chemistry stirred the imagination of chemists with exciting possibilities of tailoring molecules with cavities whose size, shape and donor properties would allow for the capture of any desired guest species for seemingly boundless applications [2][3][4][5][6][7][8][9][10][11] .…”

mentioning

confidence: 99%

Crown ethers in graphene

et al. 2014

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Crown ethers are at their most basic level rings constructed of oxygen atoms linked by twoor three-carbon chains. They have attracted attention for their ability to selectively incorporate various atoms or molecules within the cavity formed by the ring. However, crown ethers are typically highly flexible, frustrating efforts to rigidify them for many uses that demand higher binding affinity and selectivity. Here we present atomic-resolution images of the same basic structures of the original crown ethers embedded in graphene. This arrangement constrains the crown ethers to be rigid and planar. First-principles calculations show that the close similarity of the structures should also extend to their selectivity towards specific metal cations. Crown ethers in graphene offer a simple environment that can be systematically tested and modelled. Thus, we expect that our finding will introduce a new wave of investigations and applications of chemically functionalized graphene.

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confidence: 99%

Crown ethers in graphene

et al. 2014

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“…17 No coverage was reported by Banerjee and co-workers. 18 A high surface coverage of approximately 34% is achieved in the present work.…”

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confidence: 81%

Crown-Ether Derived Graphene Hybrid Composite for Membrane-Free Potentiometric Sensing of Alkali Metal Ions

Olsen

Ulstrup

Chi

2015

ACS Appl. Mater. Interfaces

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We report the design and synthesis of newly functionalized graphene hybrid material that can be used for selective membrane-free potentiometric detection of alkali metal ions, represented by potassium ions. Reduced graphene oxide (RGO) functionalized covalently by 18-crown[6] ether with a dense surface coverage is achieved by the introduction of a flexible linking molecule. The resulting hybrid composite is highly stable and is capable of detecting potassium ions down to micromolar ranges with a selectivity over other cations (including Ca(2+), Li(+), Na(+), NH4(+)) at concentrations up to 25 mM. This material can be combined further with disposable chips, demonstrating its promise as an effective ion-selective sensing component for practical applications.

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“…Since the seminal work of the Nobel Prize winner Petersen showing that crown ethers form strong supramolecular complexes with alkali metal ions and that the high stability of these supramolecular ions can be used to modify the properties of alkali metal salts, including their solubility in organic solvents, this type of supramolecular entities have been widely used in different fields, including the development of responsive molecules, sensors and electroresponsive materials . Not surprisingly, Gs have also been modified by azacrown ethers to allow their binding with alkali metal ions . Specifically, 1‐aza‐18‐crown‐6 was attached through the N atom to GO by reaction of GO and the parent azacrown in water at 100 °C under basic conditions (Scheme ) .…”

Section: Photoinduced Electron/energy Transfer Processes Using Organimentioning

confidence: 99%

Covalently Modified Graphenes in Catalysis, Electrocatalysis and Photoresponsive Materials

Navalón

Herance

Álvaro

et al. 2017

Chemistry A European J

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The ideal graphene is a one-atom thick single layer of carbon atoms having sp hybridation in hexagonal arrangement. Due to their large surface area and good dispersability in common solvents, graphenes are suitable platforms to anchor covalently units. The appended unit can introduce additional functionality to graphene. Although the field of covalently modified graphene is still starting compared to the development of other carbon nanoforms, there is already many examples describing the use of modified graphenes as recoverable photo-, electrocatalysts as well as in non-linear optics and to improve mechanical resistance and solubility of graphenes. In this Review, the state of the art of covalently modified graphenes for these applications is reviewed. After some general sections describing properties and characterization techniques of graphenes relevant to their use as supports and those general reactions and starting substrates to obtain the modified graphene conjugates, the main body of the review describes the preparation and properties of covalently modified graphene depending on their use as catalyst, photocatalyst, photoresponsive material, non-linear optics, electrocatalyst and other uses. The last section of the review summarizes the main achievements of the field and what should be according to our view the future developments.

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Tunability by alkali metal cations of photoinduced charge separation in azacrown functionalized graphene

Cited by 27 publications

References 12 publications

Crown ethers in graphene

Crown ethers in graphene

Crown-Ether Derived Graphene Hybrid Composite for Membrane-Free Potentiometric Sensing of Alkali Metal Ions

Covalently Modified Graphenes in Catalysis, Electrocatalysis and Photoresponsive Materials

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