Generation of twisted nanowires with achiral organic amphiphilic copper complexes

Isenberg, Carolin; Käkel, Eireen; Saragi, Tobat P. I.; Thoma, Peter; Weber, Birgit; Lorenz, Alexander

doi:10.1039/c8ra09027k

Cited by 4 publications

(9 citation statements)

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“…9 Nanowires (NWs) as active layers of UV-OLEDs have attracted considerable attention due to their unique merits as compared to the thin lm based devices. [10][11][12][13] While thin lms may exhibit an abundance of grain boundaries and joint defects, [14][15][16][17][18] where non-radiative recombinations can occur, NWs effectively circumvent this issue and exhibit enhanced emission efficiency. 19 Besides, because of the less contact areas between the n-type and p-type semiconductor materials, epitaxial heterojunctions exhibit fewer defect densities and interfacial strains.…”

Section: Introductionmentioning

confidence: 99%

Retracted Article: Wavelength modulation of ZnO nanowire based organic light-emitting diodes with ultraviolet electroluminescence

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Retracted Article: Wavelength modulation of ZnO nanowire based organic light-emitting diodes with ultraviolet electroluminescence

et al. 2020

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“…Aggregation phenomena must be expected to be even more prevalent in [CuL] , due to the presence of long alkoxy tails that support lipid‐like interactions. Indeed, previous investigations of amphiphilic copper(II) complexes showed a very low solubility in most common solvents [9] . The introduction of the phenyl substituent in close proximity of the copper(II) center leads to a significantly increased solubility of the complex in toluene (up to 2.3 wt%), but also in n ‐ and iso ‐octane, while the solubility in polar solvents remained very low.…”

Section: Resultsmentioning

confidence: 97%

“…The synthesis of the new ligand H 2 L and its copper(II) complex [CuL] was performed analogously to procedures described previously (Scheme 1). [9,10] As a structural and spectroscopic reference, the analogous nickel(II) complex [NiL] was prepared. Elemental analysis of the ligand and the derived nickel and copper complexes match with solvent-free formulations.…”

Section: Synthesis and Characterizationmentioning

confidence: 99%

“…Indeed, previous investigations of amphiphilic copper(II) complexes showed a very low solubility in most common solvents. [9] The introduction of the phenyl substituent in close proximity of the copper(II) center leads to a significantly increased solubility of the complex in toluene (up to 2.3 wt%), but also in n-and iso-octane, while the solubility in polar solvents remained very low. Interestingly, gel formation was observed for the iso-octane solutions within two days (Photograph in Scheme 1; less pronounced in n-octane and n-heptane).…”

Section: Concentrated Solutions Of [Cul]mentioning

confidence: 99%

“…Charge transport along the wires has been investigated, but the magnetic behavior was not studied. [9] Here we report on the synthesis and characterization of an amphiphilic copper(II) complex. The presence of bulky phenyl substituents on the head groups was found to reflect in the spectroscopic properties as well as the aggregation behavior, which turns out to be strongly dependent on the solvent.…”

Section: Introductionmentioning

confidence: 99%

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Solvent‐Dependent Self‐Assembly of an Amphiphilic Copper(II) Complex with Bulky Head Groups

et al. 2022

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Dedicated to Prof. Wolfgang Beck on the occasion of his 90th birthday.The aggregation behavior of an amphiphilic copper(II) complex was studied in solution by means of UV-Vis and EPR spectroscopy. While dilute solutions in polar media do not give indication of relevant intermolecular interactions, concentrated solutions in nonpolar media clearly do not reflect the molecular properties of [CuL] (H 2 L: N 2 O 2 ligand of the Jäger-type with bulky head-group and long alkoxy tailing). Massive broadening of EPR-lines is prevalent in non-polar media, such as n-heptane and iso-octane. In combination with DFT-modelling, the solvent-dependence of the EPR response (line widths and Cuhyperfine coupling) could be associated with the formation of oligomers with weak anti-ferromagnetically coupled copper centers. Weak anti-ferromagnetic coupling becomes evident also by SQUID magnetometry at T < 10 K of solid samples of [CuL]. The tendency towards supramolecular aggregation is unequivocally shown by electron microscopy of dried (TEM) and frozen samples (cryo-TEM). While the former approach gives evidence of the formation of extended 2D sheet-like structures with extensions on the micrometer scale, the latter technique identifies the formation of 1D thread-like structures with lengths of several hundred nanometers.

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Chirality Determination of Nanocrystals by Electron Crystallography

Wang,

Chu

et al. 2024

J. Phys. Chem. Lett.

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Chirality is a common phenomenon in nature and plays an important role in the properties of matter. The rational synthesis of chiral compounds and exploration of their applications in various fields require an unambiguous determination of their handedness. However, in many cases, determinations of the chiral crystal structure and chiral morphology have been a challenging task due to the lack of proper characterization methods, especially for nanosized crystals. Therefore, it is crucial to develop novel and efficient characterization methods. Owing to the strong interactions between matter and electrons, electron crystallography has become a powerful tool for structural analysis of nanomaterials. In recent years, methods based on electron crystallography, such as high-resolution electron microscopy imaging and electron diffraction, have been developed to unravel the chirality of nanomaterials. This brings new opportunities to the design, synthesis, and applications of versatile chiral nanomaterials. In this perspective, we summarize the recent methodology developments and ongoing research of electron crystallography for chiral structure and morphology determination of nanocrystals, including inorganic and organic materials, as well as highlight the potential and further improvement of these methods in the future.C hirality is a geometric property of a rigid object being nonsuperposable on its mirror image. 1 In nature, chirality is ubiquitous at multiple levels, from subatomic particles, organic molecules such as amino acids, macromolecules including proteins and DNA, macroscopic entities like sea shells, to even spiral galaxies. 2 Chirality has attracted great interest from multidisciplinary fields, including chemistry, biology, pharmacy, and materials science. 3 The Nobel Prize in Chemistry has recognized outstanding research in chiral synthesis and asymmetric catalysis twice in the past two decades. 4,5 In the pharmaceutical industry, more than half of clinical drugs belong to chiral molecules. 6 Moreover, chiral materials exhibit a wide range of exploitable properties, including optical behavior, enantioselectivity, ferroelectricity, electrochemical properties, and biological activity. 7−10 These cumulative factors highlight the significance of studying chirality in various scientific fields.With the rapid development of synthesis and applications of chiral compounds, one important and challenging task becomes prominent: how to effectively characterize the handedness of chiral materials. One of the difficulties is that two enantiomers usually exhibit similar physical and chemical properties, which makes it not easy to distinguish them using common characterization methods. Chirality of nanocrystals can be divided into two categories: chiral morphology and chiral crystal structure (Figure 1). Chiral morphology is a macroscopic property of a material. For example, some chiral materials show a special morphology (such as a helical shape). However, when we talk about chiral crystal structure, it means that the spa...

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Generation of twisted nanowires with achiral organic amphiphilic copper complexes

Abstract: Drying under solvent atmosphere (DUSA) was investigated as an experimental technique to generate self-assembled nanowires and needles from solutions of organic molecules under controlled conditions.

Cited by 4 publications

References 31 publications

Retracted Article: Wavelength modulation of ZnO nanowire based organic light-emitting diodes with ultraviolet electroluminescence

Retracted Article: Wavelength modulation of ZnO nanowire based organic light-emitting diodes with ultraviolet electroluminescence

Solvent‐Dependent Self‐Assembly of an Amphiphilic Copper(II) Complex with Bulky Head Groups

Chirality Determination of Nanocrystals by Electron Crystallography

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