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Search for "chiroptical properties" in Full Text gives 12 result(s) in Beilstein Journal of Organic Chemistry.
Switchable molecular tweezers: design and applications
Beilstein J. Org. Chem. 2024, 20, 504–539, doi:10.3762/bjoc.20.45
- chiroptical properties with a large change in the absorption spectra and a bathochromic shift in the emission maximum. This system represents a rare example of a multi-output readout system, showing responses in ECD, fluorescence, and CPL activity. The authors later reported a similar system with a bipyridine
Perspectives on push–pull chromophores derived from click-type [2 + 2] cycloaddition–retroelectrocyclization reactions of electron-rich alkynes and electron-deficient alkenes
Beilstein J. Org. Chem. 2024, 20, 125–154, doi:10.3762/bjoc.20.13
- with TCNQ in dichloromethane at room temperature afforded 50 with an impressive yield of 84%. Chiroptical properties Push–pull chromophores synthesized through the [2 + 2] CA–RE reaction can, in certain cases, exhibit distinct chiroptical properties, attributable to their nonplanar geometry and steric
Construction of hexabenzocoronene-based chiral nanographenes
Beilstein J. Org. Chem. 2023, 19, 736–751, doi:10.3762/bjoc.19.54
- to the molecules which cannot be superimposed on their own mirror image. Nanomaterials with chiroptical properties have shown potential applications in different fields such as optical devices, polarization-based information encryption, circularly polarized luminescence (CPL) lasers, or biosensing
- [20][21][22][23][24]. Currently, there is a great interest in the introduction of chirality into large conjugated polyaromatics to obtain chiral NGs with chiroptical properties. Among these chiral NGs, helicenes represent the dominant chiral compounds by virtue of their inherent helical chirality [25
- final Scholl cyclodehydrogenation of 85 afforded the HBC-trimer 86. The non-linear optics of NG 86 and the chiroptical properties of enantiomers were well studied. The CPL spectra centered at 610 nm were observed for both enantiomeric forms and the glum was determined as 2 × 10−3. Due to large
Synthesis and circularly polarized luminescence properties of BINOL-derived bisbenzofuro[2,3-b:3’,2’-e]pyridines (BBZFPys)
Beilstein J. Org. Chem. 2020, 16, 325–336, doi:10.3762/bjoc.16.32
- -shifted than 4a despite such a sterically demanding group usually disturbs intermolecular stacking interactions. Subsequently, the chiroptical properties of the synthesized compounds were evaluated (Figure 2 and Figure 3, Table 2). The circular dichroism (CD) spectra in CHCl3 solutions showed apparent
Polarization spectroscopy methods in the determination of interactions of small molecules with nucleic acids – tutorial
Beilstein J. Org. Chem. 2018, 14, 84–105, doi:10.3762/bjoc.14.5
- mechanism between the various π→π* transitions of regularly arranged chromophores [14] (Figure 3, top). Chiroptical properties and ECD spectra of particular DNA or RNA sequences are therefore strongly dependent on the polynucleotide secondary structure [15], at variance to the common UV–vis spectra of the
- chiroptical properties and will not be discussed here, but if a similar signal is obtained, it is advisable to refer to a set of methods dealing with DNA condensation (AFM, DLS). 4. Linear dichroism, LD Circular and linear dichroism spectroscopy (ECD and LD) are often used as complementary tools for the
Determination of the absolute stereostructure of a cyclic azobenzene from the crystal structure of the precursor containing a heavy element
Beilstein J. Org. Chem. 2016, 12, 2211–2215, doi:10.3762/bjoc.12.212
- enantiomers, respectively with the retention time of 11.9 and 13.5 min (Figure 2d). Comparing the chromatograms of the reduced product and the racemic mixture, it is clear that the reduced product is the first eluted enantiomer of (E)-2. To further confirm the formation of (E)-2A we studied the chiroptical
- properties of the product obtained by reductive debromination. Figure 3 shows the circular dichroism spectra of the reduced product along with that of S-(−)-(E)-1. From the spectral features and band intensity ratios, it is clear that the reduced product shows completely different cotton bands with that of S
[2.2]Paracyclophane derivatives containing tetrathiafulvalene moieties
Beilstein J. Org. Chem. 2015, 11, 1917–1921, doi:10.3762/bjoc.11.207
- recent report has appeared concerning the synthesis of a [2.2]paracyclophane doubly substituted by a dimeric tetrathiafulvalene in a pseudo-ortho substitution pattern [10]. This compound exhibited novel chiroptical properties. Prompted by these observations, we decided to investigate the synthesis of a
- isolation in order to investigate their structural and chiroptical properties. Conclusion The synthesis of as yet inseparable isomeric tetrathiafulvalenes has been performed by desulfurative dimerization of a [2.2]paracyclophane-substituted trithione. The latter compound was obtained from the corresponding
Selected synthetic strategies to cyclophanes
Beilstein J. Org. Chem. 2015, 11, 1274–1331, doi:10.3762/bjoc.11.142
- macrocycles. These molecules show excellent chiroptical properties such as high fluorescence quantum efficiency and a large circularly polarized luminescence dissymmetry factor. Cyclophanes are carbon-rich materials containing extensive alkyne moieties with a persistent molecular architecture. Orita and co
Regioselective synthesis of chiral dimethyl-bis(ethylenedithio)tetrathiafulvalene sulfones
Beilstein J. Org. Chem. 2015, 11, 1105–1111, doi:10.3762/bjoc.11.124
- previously observed only in bismuth wires and carbon nanotubes [13]. Another interesting research area is the redox modulation of the chiroptical properties described in derivatives such as TTF-allenes [14], TTF-helicenes [15], or TTF-paracyclophanes [16]. Thus, to address the different opportunities offered
Chiroptical properties of 1,3-diphenylallene-anchored tetrathiafulvalene and its polymer synthesis
Beilstein J. Org. Chem. 2015, 11, 972–979, doi:10.3762/bjoc.11.109
- , Chiba 275-0016, Japan 10.3762/bjoc.11.109 Abstract A novel tetrathiafulvalene dimer, bridged by a chiral 1,3-diphenylallene framework, has been prepared as an optically active compound having strong chiroptical properties. Although a chiral allene bearing strong electron-donating group(s) often
- undergoes slow photoracemization even in daylight, the present allene is totally configurationally stable under ordinary conditions. Each isomer possesses pronounced chiroptical properties in its ECD spectra reflecting the chiral allene framework. Moreover, the elongation of the chiral main chain was also
- carried out by direct C–H activation of the TTF unit, and the chiroptical properties of the resulting polymer were also investigated. Keywords: allene; axial chirality; chiroptical properties; redox; tetrathiafulvalene; Introduction Recently, there has been a growing interest in chiral π-conjugated
Synthesis and stereochemical assignments of diastereomeric Ni(II) complexes of glycine Schiff base with (R)-2-(N-{2-[N-alkyl-N-(1-phenylethyl)amino]acetyl}amino)benzophenone; a case of configurationally stable stereogenic nitrogen
Beilstein J. Org. Chem. 2014, 10, 442–448, doi:10.3762/bjoc.10.41
- and the Ar–H. As we have mentioned above, there is a great degree of similarity in the chiroptical properties of complexes 5b–e and 6b–e, sufficient to make the corresponding stereochemical assignments. Moreover, there is also another general trend observed in the 1H NMR spectra of compounds 5 and 6
Continuous flow photocyclization of stilbenes – scalable synthesis of functionalized phenanthrenes and helicenes
Beilstein J. Org. Chem. 2013, 9, 1883–1890, doi:10.3762/bjoc.9.221
- which are relevant for materials sciences, as well as toward helicenes, an intriguing class of molecules which show remarkable chiroptical properties due to their helical pitch. The rapidly expanding field of application of helicene-like molecules in materials sciences and optics demands the development
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