2,2,6,6-Tetramethylpiperidine-1-yloxyl bound to the imidazolium ion by an acetamido group for investigation of ionic liquids

Strehmel, Veronika; Rexhausen, Hans; Strauch, Peter

doi:10.1016/j.tetlet.2009.11.124

Cited by 6 publications

(2 citation statements)

References 25 publications

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“…In fact, although this is another type of soft materials, the studies using the ionic liquid imidazolium nitroxide radical ( ±)-6 as an EPR spin probe revealed that the R value of (±)-6 in the host ionic liquid 10 became much smaller than that simply estimated from the viscosity  of 10, implying the existence of local structures in the host ionic liquid [13] (Figure 4). This behavior was not observed when typical neutral nitroxide spin probes such as TEMPO were employed with the same host 10 [13,14]. Accordingly, it is desirable to use an LC spin probe in a diamagnetic host LC material.…”

Section: X2 Non-lc Nitroxide Spin Probes In Diamagnetic Lc Hostsmentioning

confidence: 97%

EPR characterization of diamagnetic and magnetic organic soft materials using nitroxide spin probe techniques

Tamura

Suzuki

Uchida

et al. 2012

Electron Paramagnetic Resonance

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This review article summarizes the recent advance in the EPR studies on the molecular orientation and magnetic properties in the various rod-like liquid crystalline (LC) phases of the second-generation of organic nitroxide radical materials in the bulk state or in a surface-stabilized LC cell, compared with the conventional EPR studies using classical organic nitroxide spin probes. Noteworthy is the first observation and characterization of a sort of spin glass-like ferromagnetic interactions (J > 0) induced by weak magnetic fields in the various LC phases of the secondgeneration of organic nitroxide radical materials. This unique magnetic property has been referred to as positive "magneto-LC effects". The utility of such novel LC nitroxide radical materials as the EPR spin probes is also presented.

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Section: X2 Non-lc Nitroxide Spin Probes In Diamagnetic Lc Hostsmentioning

confidence: 97%

EPR characterization of diamagnetic and magnetic organic soft materials using nitroxide spin probe techniques

Tamura

Suzuki

Uchida

et al. 2012

Electron Paramagnetic Resonance

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“…Recently, the stable organic radical, 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO), was demonstrated to be a promising redox system for DSSCs [80,81], offering an alternative to the widely used iodide/triiodide couple. In the future, we can synthesize a novel IL with TEMPO-imidazole complex [82][83][84] for an iodine (I 2 )-free mediator system, and make application on solid-state DSSCs. This kind of TEMPO-imidazole complex containing TEMPO-redox radical and iodide-redox anion could potentially provide dual channels for charge transportation within the DSSCs.…”

Section: Summary and Future Prospectsmentioning

confidence: 99%

Solid-State Ionic Liquid Based Electrolytes for Dye-Sensitized Solar Cells

Lee¹,

Chu²,

Chang³

et al. 2013

Ionic Liquids - New Aspects for the Future

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Radicals in Ionic Liquids

Strehmel¹

2012

ChemPhysChem

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Open or closed: N‐Glycosyl oxyamine versus open‐chain glycosyl oxime is the key to protein recognition on glyconanoparticles. Unprotected glycans are captured by oxime formation with a novel bifunctional reagent and the resulting glycan‐linker conjugates are anchored to gold nanoparticles (AuNPs). These glyconanoparticles maintain the structural integrity of glycans in the study of protein–carbohydrate interactions (see figure). Nanoparticles functionalized with glycans are emerging as powerful solid‐phase chemical tools for the study of protein–carbohydrate interactions using nanoscale properties for detection of binding events. Methods or reagents that enable the assembly of glyconanoparticles from unprotected glycans in two consecutive chemoselective steps with meaningful display of the glycan are highly desirable. Here, we describe a novel bifunctional reagent that 1) couples to glycans by oxime formation in solution, 2) aids in purification through a lipophilic trityl tag, and 3) after deprotection then couples to gold nanoparticles through a thiol. NMR studies revealed that these oximes exist as both the open‐chain and N‐glycosyl oxy‐amine tautomers. Glycan‐linker conjugates were coupled through displacement of ligands from preformed, citrate‐stabilized gold nanoparticles. Recognition of these glycans by proteins was studied with a lectin, concanavalin A (ConA), in an aggregation assay and with a processing enzyme and glucoamylase (GA). We demonstrate that the presence of the N‐glycosyl oxy‐amines clearly enables functional recognition in sharp contrast to the corresponding reduced oxy‐amines. This concept is then realized in a novel reagent, which should facilitate nanoglycobiology by enabling the operationally simple capture of glycans and their biologically meaningful display.

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2,2,6,6-Tetramethylpiperidine-1-yloxyl bound to the imidazolium ion by an acetamido group for investigation of ionic liquids

Cited by 6 publications

References 25 publications

EPR characterization of diamagnetic and magnetic organic soft materials using nitroxide spin probe techniques

EPR characterization of diamagnetic and magnetic organic soft materials using nitroxide spin probe techniques

Solid-State Ionic Liquid Based Electrolytes for Dye-Sensitized Solar Cells

Radicals in Ionic Liquids

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