9 article(s) from Schalley, Christoph A
- Full Research Paper
- Published 20 Oct 2020
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Figure 1: Structures of the compounds used in this study: a) crown-8 analogs; b) crown-7 analogs; c) secondar...
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Scheme 1: Schematic representation of synthetic routes towards TTFC7, exTTFC7, NDIC7, and NDIC8.
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Figure 2: Solid-state structures of a) exTTFC7 (CH3CN molecule omitted for clarity), b) NDIC7 (CH3CN molecule...
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Figure 3: a) Synthesis of the [2]rotaxane NDIRot. b) Stacked 1H NMR spectra (700 MHz, CDCl3, 298 K) of NDIC8 ...
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Figure 4: UV–vis–NIR spectra obtained by spectroelectrochemical measurements (0.1 M n-Bu4PF6, CH2Cl2/CH3CN 1:...
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- Full Research Paper
- Published 21 Oct 2019
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Scheme 1: Structures of tetraisobutylpyridine[4]arene 1 and tetraisobutylresorcin[4]arene 2.
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Figure 1: Spectra of 1 + Me4NPF6 1:3 in acetone in a) (+)ESI-MS and b) (−)ESI-MS. Insets showing arrival time...
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Figure 2: (+)ESI-MS profile spectrum of the mixture of 1, 2 and TMAPF6 in acetonitrile (20 µM, 1:1:1). Inset ...
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Figure 3: Calculated ESP surfaces (in au) superimposed on the total electron density (0.004 au) for 1 and 2: ...
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- Review
- Published 20 Aug 2018
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Figure 1: The two one-electron oxidation reactions of tetrathiafulvalene (TTF, 1) and the corresponding prope...
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Figure 2: UV–vis spectra and photographs of TTF 2 in its three stable oxidation states (black line = 2, orang...
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Figure 3: Structure and conformations of two TTF dimers in solution, the mixed-valence and the radical-cation...
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Figure 4: (a) The isomerism problem of TTF. (b)–(d) Major synthetic breakthroughs for the construction of TTF...
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Figure 5: (a) Host–guest equilibrium between π-electron-poor cyclophane 3 and different TTFs with their corre...
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Figure 6: TTF complexes with different host molecules.
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Figure 7: Stable TTF (a) radical-cation and (b) mixed-valence dimers in confined molecular spaces.
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Figure 8: A “three-pole supramolecular switch”: Controlled by its oxidation state, TTF (1) jumps back and for...
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Figure 9: Redox-controlled closing and opening motion of the artificial molecular lasso 12.
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Figure 10: Graphical illustration how a non-degenerate TTF-based shuttle works under electrochemical operation....
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Figure 11: The first TTF-based rotaxane 13.
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Figure 12: A redox-switchable bistable molecular shuttle 14.
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Figure 13: The redox-switchable cyclodextrin-based rotaxane 15.
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Figure 14: The redox-switchable non-ionic rotaxane 16 with a pyromellitic diimide macrocycle.
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Figure 15: The redox-switchable TTF rotaxane 17 based on a crown/ammonium binding motif.
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Figure 16: Structure and operation of the electro- and photochemically switchable rotaxane 18 which acts as po...
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Figure 17: (a) The redox-switchable rotaxane 19 with a donor–acceptor pair which is stable in five different s...
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Figure 18: Schematic representation of a molecular electronic memory based on a bistable TTF-based rotaxane. (...
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Figure 19: Schematic representation of bending motion of a microcantilever beam with gold surface induced by o...
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Figure 20: TTF-dimer interactions in a redox-switchable tripodal [4]rotaxane 22.
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Figure 21: (a) A molecular friction clutch 23 which can be operated by electrochemical stimuli. (b) Schematic ...
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Figure 22: Fusion between rotaxane and catenane: a [3]rotacatenane 24 which can stabilize TTF dimers.
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Figure 23: The first TTF-based catenane 25.
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Figure 24: Electrochemically controlled circumrotation of the bistable catenane 26.
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Figure 25: A tristable switch based on the redox-active [2]catenane 27 with three different stations.
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Figure 26: Structure of catenane-functionalized MOF NU-1000 [108] with structural representation of subcomponents. ...
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Figure 27: (a) [3]Catenanes 29 and 30 which can stabilize mixed-valence or radical-cation dimers of TTF. (b) S...
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Discrete multiporphyrin pseudorotaxane assemblies from di- and tetravalent porphyrin building blocks
- Full Research Paper
- Published 12 May 2015
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Figure 1: Mono-, di-, and tetravalent axles A1, A2 and A4 and mono-, di-, and tetravalent hosts C1, C2 and C4...
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Scheme 1: Overview of the synthesis of the guests A2 and A4. a) Pyrrole (4), BF3·Et2O, DDQ, CHCl3, rt; b) Zn(...
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Scheme 2: Synthesis of crown ether hosts C4 and C2: a) K2CO3, LiBr, 17, 2-[2-(2-chloroethoxy)ethoxy]ethanol, ...
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Figure 2: Schematic representation of the host–guests complexes. Top: complexes A2@C12, A4@C14, A12@C2 and A14...
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Figure 3: 1H NMR (500 MHz, 298 K, CD2Cl2, 3 mM) of a) C1 (top), A2@C12 (middle) and A2 (bottom); b) C1 (top), ...
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Figure 4: 1H NMR (500 MHz, 298 K, CD2Cl2, 3 mM) of a) C2 (top), A12@C2 (middle) and A1 (bottom) and b) C4 (to...
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Figure 5: Normalized UV–vis absorption spectra (CH2Cl2, 3 μM) of A2, A4, C2 and C4 and their complexes formed...
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Figure 6: ESI-Q-TOF-MS spectra (CH2Cl2, 0.2 µM; left hand side) and respective experimental and calculated is...
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Figure 7: 1H NMR (500 MHz, 298 K, CD2Cl2, 1 mM) of a) C4 (top), A22@C4 (middle) and A2 (bottom); b) C2 (top), ...
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Figure 8: 1H NMR (500 MHz, 298 K, CD2Cl2, 1 mM) of a) C4 (top), A4@C4 (middle) and A4 (bottom) and b) C2 (top...
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Figure 9: Normalized UV–vis absorption spectra (CH2Cl2, 2 μM) of the guests A2 and A4 (black), the hosts C2 a...
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Figure 10: ESI-Q-TOF-MS spectra (CH2Cl2, 0.2 µM; left hand side) and respective experimental and calculated is...
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- Full Research Paper
- Published 09 Feb 2012
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Figure 1: Hunter/Vögtle-type tetralactam macrocycle 1 bearing an iodo substituent at one of the isophthaloyl ...
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Scheme 1: Synthesis of the monovalent diamide axle 2, which was used for Sonogashira coupling to the appropri...
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Scheme 2: Synthesis of divalent wheels from TLM 1: (a), (b) (Ph3P)2PdCl2, CuI, PPh3, NEt3, DMF, 25 °C, 24 h, ...
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Scheme 3: Synthesis of trivalent wheel 14 from TLM 1: (a) (Ph3P)2PdCl2, CuI, PPh3, NEt3, DMF, 25 °C, 24 h, 40...
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Scheme 4: (a) Pd2(dba)3, AsPh3, NEt3, DMF, 120 °C, 12 h, 7% (16).
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Scheme 5: Synthesis of a series of multivalent guests starting from the axle 2. (a), (b), (c), (d): Pd2(dba)3...
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Scheme 6: Synthesis of the tetravalent axle 23 and its divalent side product: (a) Pd2(dba)3, AsPh3, NEt3, DMF...
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Figure 2: Aliphatic regions of the 1H NMR spectra (CD2Cl2, 500 MHz, 298 K, 2.3 mM) of (a) 10 (top), 17@10 (ce...
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- Full Research Paper
- Published 11 Feb 2010
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Scheme 1: Two synthetic procedures for the preparation of benzo-21-crown-7 (C7) and its formyl analogue 4: To...
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Scheme 2: Molecular structures of guests 5-H•PF6, 6-H•PF6, and 7-H•PF6, and their complexes with 2-(n), C7 an...
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Figure 1: 1H NMR spectra (500 MHz, 298 K, CDCl3:CD3CN = 2:1, 10.0 mM) of 5-H•PF6 (a), mixture of 5-H•PF6 and ...
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Figure 2: ESI-FTICR mass spectrum of a mixture of 5-H•PF6 and 2-(n) in dichloromethane.
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Figure 3: 1H NMR spectra (500 MHz, 298 K, CDCl3, 10.0 mM) of (a) C7, (b) C7 in the presence of 1 eq. KPF6, (c...
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Figure 4: 1H NMR spectra (500 MHz, 298 K, CDCl3:CD3CN = 2:1, 10.0 mM) of (a) 6-HoPF6, (b) mixture of 6-HoPF6 ...
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Figure 5: 1H NMR spectra (500 MHz, 298 K, CDCl3:CD3CN = 2:1, 10.0 mM) of (a) 6-H•PF6, equimolar mixtures of (b...
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