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Search for "spectroelectrochemistry" in Full Text gives 14 result(s) in Beilstein Journal of Organic Chemistry.
Naphthalimide-phenothiazine dyads: effect of conformational flexibility and matching of the energy of the charge-transfer state and the localized triplet excited state on the thermally activated delayed fluorescence
Beilstein J. Org. Chem. 2022, 18, 1435–1453, doi:10.3762/bjoc.18.149
- spectroelectrochemistry of the compounds was studied (Figure 7). For NI-PTZ, when a positive potential of +0.53 V (vs Ag/AgNO3) was applied, the hallmark absorption bands of the PTZ•+ radical cation centered at 516, 794, and 891 nm are observed [20]. These bands are similar to the ones observed for the previously
- , the PTZ•+ absorption bands of NI-PTZ-O are less resolved as compared to those of NI-PTZ (Figure 7a). These results indicate the effect of oxidation of the PTZ moiety. The spectroelectrochemistry traces of NI-Ph-PTZ, NI-PTZ2, and NI-PhMe2-PTZ were also studied (Supporting Information File 1, Figure S31
- that the spin density of PTZ•+ in NI-Ph-PTZ is confined on the PTZ moiety, and does not significantly spread on the phenyl linker. The spectroelectrochemistry of NI-PhMe2-PTZ shows that the NI•− absorption band in this dyad is similar to that of NI-PTZ, but not to the one of NI-Ph-PTZ. This illustrates
Introducing a new 7-ring fused diindenone-dithieno[3,2-b:2',3'-d]thiophene unit as a promising component for organic semiconductor materials
Beilstein J. Org. Chem. 2022, 18, 944–955, doi:10.3762/bjoc.18.94
- V (ΔEp = 0.06 V), respectively. UV–vis absorption spectroelectrochemistry (see Figures S20 and S21 in Supporting Information File 1) shows the evolution of the dication and dianion states with the longest wavelength absorption band extending into the near-IR with broad features, characteristic of
- two sequential reversible oxidations and two sequential reversible reduction waves. UV–vis spectroelectrochemistry reveals the absorption profiles of the dications and dianions as highly delocalised intermediate charged states. EtH-T-DI-DTT is readily soluble in organic solvents due to the ethylhexyl
Thermodynamic and electrochemical study of tailor-made crown ethers for redox-switchable (pseudo)rotaxanes
Beilstein J. Org. Chem. 2020, 16, 2576–2588, doi:10.3762/bjoc.16.209
- properties of the rotaxane NDIRot were investigated by UV–vis–NIR spectroelectrochemistry in a CH2Cl2/CH3CN 1:1 mixture and compared to NDIC8 and NDIC7 (Figure 4 and Table S3 in Supporting Information File 1). In the neutral state, the rotaxane displays the typical absorption pattern of an N,N’-disubstituted
Selenophene-containing heterotriacenes by a C–Se coupling/cyclization reaction
Beilstein J. Org. Chem. 2019, 15, 1379–1393, doi:10.3762/bjoc.15.138
- via spectroelectrochemistry using a previously described setup with a platinum working electrode and UV–vis–NIR spectra were recorded in reflectance mode [53]. At the beginning of the measurements a potential of −500 mV (vs Ag/AgCl) was applied in order to obtain the neutral polymer films without any
Oxidative and reductive cyclization in stiff dithienylethenes
Beilstein J. Org. Chem. 2018, 14, 2812–2821, doi:10.3762/bjoc.14.259
- distinct oxidation waves. The first one is reversible whereas the second is quasi-reversible. Experiments were carried out in MeCN with 0.1 M Bu4NPF6, c = 1∙10−3 M, dE/dt = 1 V s−1. Spectroelectrochemistry of sDTE66-Me. Absorption changes during CV, insets showing the corresponding cyclovoltammograms with
Tetrathiafulvalene – a redox-switchable building block to control motion in mechanically interlocked molecules
Beilstein J. Org. Chem. 2018, 14, 2163–2185, doi:10.3762/bjoc.14.190
- and the rotaxane was isolated in 34% yield. NMR spectroscopy, cyclic voltammetry, and spectroelectrochemistry showed that the wheel translates to the dihydroxynaphthalene station upon TTF oxidation. The use of TTF in redox-switchable rotaxanes is not limited to the implementation into axle components
Spectroelectrochemical studies on the effect of cations in the alkaline glycerol oxidation reaction over carbon nanotube-supported Pd nanoparticles
Beilstein J. Org. Chem. 2018, 14, 1428–1435, doi:10.3762/bjoc.14.120
- Autolab potentiostat and is reported versus the reversible hydrogen electrode scale. Spectroelectrochemistry FTIR experiments were performed in a spectroelectrochemical cell described in detail in ref. [36]. In brief, it combines ATR–IR spectroscopy with electrochemical techniques in a thin electrolyte
Polysubstituted ferrocenes as tunable redox mediators
Beilstein J. Org. Chem. 2018, 14, 1004–1015, doi:10.3762/bjoc.14.86
- electrosynthesis. Keywords: cyclic voltammetry; ferrocene; paramagnetic NMR spectroscopy; redox mediator; spectroelectrochemistry; Introduction Since its discovery, ferrocene (FcH) has been established as versatile redox-active building block [1][2][3]. Ferrocene can be reversibly oxidized to the 17 valence
- and especially σm to include the effect on the relative positions of substituents for E1/2 of polysubstituted ferrocenes has to be further validated with other series of polysubstituted ferrocenes. IR spectroelectrochemistry of esters 1–4 In the attenuated total reflection (ATR) IR spectra of solid
- stretching vibration delivers a useful in operando probe substantiating the stability of the redox mediator and enabling quantification of both redox partners and hence estimation of the actual concentration-dependent redox potential in solution. UV–vis spectroelectrochemistry of esters 1–4 Analogous to the
Polythiophene and oligothiophene systems modified by TTF electroactive units for organic electronics
Beilstein J. Org. Chem. 2015, 11, 1749–1766, doi:10.3762/bjoc.11.191
- (TTF and PT) inhibits any electrochemical activity from the polymer backbone and the electrochemistry of the material is dominated by the TTF unit. The inhibition of the polymer backbone’s electrochemical activity was confirmed by spectroelectrochemistry of 39, which indicated no change of the π–π
- spectroelectrochemistry unequivocally confirms the electrochemical activity of the polymer backbone, which is involved in the formation of polarons at potentials close to the second oxidation potential of the TTF unit. The polymer 39, which has the lowest band gap, was tested as a donor material for BHJSCs with PC61BM as
- voltammograms of a thin film of 34 at various scan rates (25 mV, 50 × n mV/s, n = 1–10). Adapted with permission from [73].Copyright 2000 The Royal Society of Chemistry. Spectroelectrochemistry of polymers 37 (a) and 34 (b) as thin films deposited on the working electrode. Adapted with permission from [76
Glycoluril–tetrathiafulvalene molecular clips: on the influence of electronic and spatial properties for binding neutral accepting guests
Beilstein J. Org. Chem. 2015, 11, 1023–1036, doi:10.3762/bjoc.11.115
- Synthesis Molecular clips 1–3 [18] and 4 [19] were synthesized according to our previous reports. Electrochemical and spectroelectrochemical experiments Electrochemistry and time-resolved spectroelectrochemistry in solution were performed using the already described home self-made cell [44][45
- sensitivity of the spectroscopic measurement (<3 electrons at 100 kHz and <13 electrons at 2 MHz between 320 and 1080 nm; 400 electrons (high gain) and 5000 electrons (low gain) between 900 nm and 1700 nm) allows performing a spectroelectrochemistry experiment under the usual conditions of electrochemistry
Interactions between tetrathiafulvalene units in dimeric structures – the influence of cyclic cores
Beilstein J. Org. Chem. 2015, 11, 930–948, doi:10.3762/bjoc.11.104
- low energy (2257 nm). We became interested in elucidating the dependence on acyclic versus cyclic bridging units in more detail by cyclic voltammetry and EPR/UV–vis–NIR spectroelectrochemistry. With regard to conformational flexibility and the lack of it, it deserves mentioning that Low and co-workers
- acyclic components, 1a and 5 (−1.65 V and −2.35 V vs Fc/Fc+). UV–vis–NIR and EPR spectra of oxidized species The EPR and optical (UV–vis–NIR) properties of the oxidized species were studied by in situ spectroelectrochemistry in CH2Cl2 (Bu4NPF6) at a platinum mesh electrode. Even at low scan rate of 2 mV s
- further oxidation to the dications, corroborating the CT character. The position of the more well-defined NIR absorption band of 8•+ is close to that of 2a•+ at 2257 nm [10]; 2b•+ also experiences this absorption according to the EPR-spectroelectrochemistry described above (see Figure 8), but in that
Photocatalytic nucleophilic addition of alcohols to styrenes in Markovnikov and anti-Markovnikov orientation
Beilstein J. Org. Chem. 2015, 11, 568–575, doi:10.3762/bjoc.11.62
- . Spectroelectrochemistry measurements (see Supporting Information File 1) revealed that the blue colored intermediate could be assigned to the radical anion of PDI as photocatalyst whose half-lifetime was determined to be approximately 4 min (Figure 3). The appearance of this intermediate strongly supported the proposed
- –Volmer plots of PDI in the presence of substrate 1, spectroelectrochemistry of PDI, pictures of the mesoflow setups. Acknowledgements Financial support by the DFG (grant Wa 1386/17-1 and GRK 1626) and KIT is gratefully acknowledged.
Functionalized branched EDOT-terthiophene copolymer films by electropolymerization and post-polymerization “click”-reactions
Beilstein J. Org. Chem. 2015, 11, 335–347, doi:10.3762/bjoc.11.39
- ″-terthiophene (3T) is presented as a versatile route to functional polymer films. Comparisons to blend systems of the respective homopolymers PEDOT and P3T by in situ spectroelectrochemistry and Raman spectroscopy prove the successful copolymer formation and the access to tailored redox properties and energy
- broad spectral shapes with maxima around 530 nm. From the spectra of the neutral compounds a clear distinction between the copolymer and the blend is not possible. Monitoring the optical properties during the electrochemical oxidation process by in situ spectroelectrochemistry, however, gives further
- modification over the whole film. The integrity of the redox and optical behavior upon modification of the P(EDOT-N3-co-3T)-1:1 with sulfonic acid with regard to the parent copolymer was further proven by cyclic voltammetry and in situ spectroelectrochemistry. It was recently demonstrated that the azide group
Sexithiophenes as efficient luminescence quenchers of quantum dots
Beilstein J. Org. Chem. 2011, 7, 1722–1731, doi:10.3762/bjoc.7.202
- Sexithiophenes 1a and 1b, in which a 4-(dimethylamino)phenyl unit is incorporated as an end-capping group, were synthesised and characterised by cyclic voltammetry, absorption spectroscopy and UV–vis spectroelectrochemistry. Additionally, their ability to function as effective luminescence quenchers for quantum
- trap states for nonradiative emission. Conclusion Two novel sexithiophene families, 1a,b and 2a,b, were synthesised and investigated as luminescence quenchers of quantum dots. Their properties were investigated by cyclic voltammetry, UV–vis absorption and spectroelectrochemistry. The addition of the
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