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  1. Article ; Online: Self-assembly of chiral diketopyrrolopyrrole chromophores giving supramolecular chains in monolayers and twisted microtapes.

    Humphreys, Joshua / Killalea, C Elizabeth / Pop, Flavia / Davies, E Stephen / Siligardi, Giuliano / Amabilino, David B

    Chirality

    2023  Volume 35, Issue 5, Page(s) 281–297

    Abstract: Chiral diketopyrrolopyrroles appended with enantiomeric ethyl lactate functions through an ether linkage to the aryl backbone of the chromophore were synthesized via the Mitsunobu reaction. The molecules have good solubility and excellent optical ... ...

    Abstract Chiral diketopyrrolopyrroles appended with enantiomeric ethyl lactate functions through an ether linkage to the aryl backbone of the chromophore were synthesized via the Mitsunobu reaction. The molecules have good solubility and excellent optical properties, high molar absorption coefficients, and fluorescence quantum yields. Helical aggregates with circular dichroism arising from the supramolecular arrangement are seen in both solution and thin films, and the aggregates also display circularly polarized luminescence (g
    Language English
    Publishing date 2023-02-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1011639-4
    ISSN 1520-636X ; 0899-0042
    ISSN (online) 1520-636X
    ISSN 0899-0042
    DOI 10.1002/chir.23539
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2594: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (2.OG)
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  2. Article ; Online: per

    Pearce, Nicholas / Davies, E Stephen / Champness, Neil R

    Molecules (Basel, Switzerland)

    2020  Volume 25, Issue 7

    Abstract: 1,4-dimethoxypillar[5]arene undergoes reversible multielectron oxidations forming stable radical cations, a property retained when incorporated in [2]rotaxanes, suggesting that pillar[5]arenes can be employed as viable, yet unreported, electron donors. ...

    Abstract 1,4-dimethoxypillar[5]arene undergoes reversible multielectron oxidations forming stable radical cations, a property retained when incorporated in [2]rotaxanes, suggesting that pillar[5]arenes can be employed as viable, yet unreported, electron donors.
    MeSH term(s) Calixarenes/chemistry ; Electrochemical Techniques ; Molecular Structure ; Rotaxanes/chemistry
    Chemical Substances Rotaxanes ; pillar(5)arene ; Calixarenes (130036-26-9)
    Language English
    Publishing date 2020-04-02
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules25071627
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  3. Article ; Online: Highly electron deficient diketopyrrolopyrroles.

    Humphreys, Joshua / Malagreca, Ferdinando / Hume, Paul A / Davies, E Stephen / Argent, Stephen P / Bradshaw, Tracey D / Amabilino, David B

    Chemical communications (Cambridge, England)

    2023  Volume 59, Issue 12, Page(s) 1613–1616

    Abstract: The synthesis, spectroelectrochemical and structural characteristics of highly electron-accepting diketopyrrrolopyrrole (DPP) molecules with adjoining pyridinium rings is reported, along with an assessment of their toxicity, which is apparently low. The ... ...

    Abstract The synthesis, spectroelectrochemical and structural characteristics of highly electron-accepting diketopyrrrolopyrrole (DPP) molecules with adjoining pyridinium rings is reported, along with an assessment of their toxicity, which is apparently low. The compounds show reversible electrochemistry and in one subfamily a massive increase in molar extinction coefficient upon electrochemical reduction.
    Language English
    Publishing date 2023-02-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/d2cc06770f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Donor-Acceptor Dyads and Triads Employing Core-Substituted Naphthalene Diimides: A Synthetic and Spectro (Electrochemical) Study.

    Quinn, Samuel / Davies, E Stephen / Pearce, Nicholas / Rosenberg, Callum / Pfeiffer, Constance R / Orton, Georgia R F / Champness, Neil R

    Molecules (Basel, Switzerland)

    2022  Volume 27, Issue 24

    Abstract: Donor-acceptor dyads and triads comprising core-substituted naphthalene diimide (NDI) chromophores and either phenothiazine or phenoxazine donors are described. Synthesis combined with electrochemical and spectroelectrochemical investigations facilitates ...

    Abstract Donor-acceptor dyads and triads comprising core-substituted naphthalene diimide (NDI) chromophores and either phenothiazine or phenoxazine donors are described. Synthesis combined with electrochemical and spectroelectrochemical investigations facilitates characterisation of the various redox states of these molecules, confirming the ability to combine arrays of electron donating and accepting moieties into single species that retain the redox properties of these individual moieties.
    Language English
    Publishing date 2022-12-08
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1413402-0
    ISSN 1420-3049 ; 1431-5165 ; 1420-3049
    ISSN (online) 1420-3049
    ISSN 1431-5165 ; 1420-3049
    DOI 10.3390/molecules27248671
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.MO 81: Show issues

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  5. Article ; Online: Sensing the Spin State of Room-Temperature Switchable Cyanometallate Frameworks with Nitrogen-Vacancy Centers in Nanodiamonds.

    Flinn, Bradley T / Rance, Graham A / Cull, William J / Cardillo-Zallo, Ian / Pitcairn, Jem / Cliffe, Matthew J / Fay, Michael W / Tyler, Ashley J / Weare, Benjamin L / Stoppiello, Craig T / Davies, E Stephen / Mather, Melissa L / Khlobystov, Andrei N

    ACS nano

    2024  Volume 18, Issue 9, Page(s) 7148–7160

    Abstract: Room-temperature magnetically switchable materials play a vital role in current and upcoming quantum technologies, such as spintronics, molecular switches, and data storage devices. The increasing miniaturization of device architectures produces a need ... ...

    Abstract Room-temperature magnetically switchable materials play a vital role in current and upcoming quantum technologies, such as spintronics, molecular switches, and data storage devices. The increasing miniaturization of device architectures produces a need to develop analytical tools capable of precisely probing spin information at the single-particle level. In this work, we demonstrate a methodology using negatively charged nitrogen vacancies (NV
    Language English
    Publishing date 2024-02-21
    Publishing country United States
    Document type Journal Article
    ISSN 1936-086X
    ISSN (online) 1936-086X
    DOI 10.1021/acsnano.3c11820
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Thionated Perylene Diimide-Phenothiazine Dyad: Synthesis, Structure, and Electrochemical Studies.

    Pearce, Nicholas / Davies, E Stephen / Lewis, William / Champness, Neil R

    ACS omega

    2018  Volume 3, Issue 10, Page(s) 14236–14244

    Abstract: Perylene diimides (PDIs) are promising candidates for n-type semiconductor materials and, thus, for use in organic electronics. Thionation of the imide moiety provides an efficient strategy to control the donor-acceptor gap of these types of compounds, ... ...

    Abstract Perylene diimides (PDIs) are promising candidates for n-type semiconductor materials and, thus, for use in organic electronics. Thionation of the imide moiety provides an efficient strategy to control the donor-acceptor gap of these types of compounds, although the degree and selectivity of thionation can be hard to achieve. Through the design of a sterically encumbered PDI-phenothiazine dyad, a previously unattained geminal thionation pattern has been realized, providing the first example of a perylene-monoimide-monothioimide. The electrochemical and solid-state structural properties of this uniquely thionated dyad are reported and compared to those of the nonthionated parent molecule. It is found that thionation enhances the electron affinity of the PDI core, affecting electrochemical and spectroelectochemcial behavior of the dyad without significantly affecting the solid-state packing of the molecules.
    Language English
    Publishing date 2018-10-26
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.8b02457
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: Slow magnetic relaxation in Fe(II)

    Valentine, Andrew J / Geer, Ana M / Blundell, Toby J / Tovey, Will / Cliffe, Matthew J / Davies, E Stephen / Argent, Stephen P / Lewis, William / McMaster, Jonathan / Taylor, Laurence J / Reta, Daniel / Kays, Deborah L

    Dalton transactions (Cambridge, England : 2003)

    2022  Volume 51, Issue 47, Page(s) 18118–18126

    Abstract: Two-coordinate transition metal complexes are exciting candidates for single-molecule magnets (SMMs) because their highly axial coordination environments lead to sizeable magnetic anisotropy. We report a series of five structurally related two-coordinate ...

    Abstract Two-coordinate transition metal complexes are exciting candidates for single-molecule magnets (SMMs) because their highly axial coordination environments lead to sizeable magnetic anisotropy. We report a series of five structurally related two-coordinate Fe(II)
    Language English
    Publishing date 2022-12-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/d2dt03531f
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Selective photoinduced charge separation in perylenediimide-pillar[5]arene rotaxanes.

    Pearce, Nicholas / Reynolds, Katherine E A / Kayal, Surajit / Sun, Xue Z / Davies, E Stephen / Malagreca, Ferdinando / Schürmann, Christian J / Ito, Sho / Yamano, Akihito / Argent, Stephen P / George, Michael W / Champness, Neil R

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 415

    Abstract: The ability to control photoinduced charge transfer within molecules represents a major challenge requiring precise control of the relative positioning and orientation of donor and acceptor groups. Here we show that such photoinduced charge transfer ... ...

    Abstract The ability to control photoinduced charge transfer within molecules represents a major challenge requiring precise control of the relative positioning and orientation of donor and acceptor groups. Here we show that such photoinduced charge transfer processes within homo- and hetero-rotaxanes can be controlled through organisation of the components of the mechanically interlocked molecules, introducing alternative pathways for electron donation. Specifically, studies of two rotaxanes are described: a homo[3]rotaxane, built from a perylenediimide diimidazolium rod that threads two pillar[5]arene macrocycles, and a hetero[4]rotaxane in which an additional bis(1,5-naphtho)-38-crown-10 (BN38C10) macrocycle encircles the central perylenediimide. The two rotaxanes are characterised by a combination of techniques including electron diffraction crystallography in the case of the hetero[4]rotaxane. Cyclic voltammetry, spectroelectrochemistry, and EPR spectroscopy are employed to establish the behaviour of the redox states of both rotaxanes and these data are used to inform photophysical studies using time-resolved infra-red (TRIR) and transient absorption (TA) spectroscopies. The latter studies illustrate the formation of a symmetry-breaking charge-separated state in the case of the homo[3]rotaxane in which charge transfer between the pillar[5]arene and perylenediimide is observed involving only one of the two macrocyclic components. In the case of the hetero[4]rotaxane charge separation is observed involving only the BN38C10 macrocycle and the perylenediimide leaving the pillar[5]arene components unperturbed.
    Language English
    Publishing date 2022-01-20
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-28022-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article: Synthesis and characterisation of rylene diimide dimers using molecular handcuffs.

    Yang, Lixu / Langer, Philipp / Davies, E Stephen / Baldoni, Matteo / Wickham, Katherine / Besley, Nicholas A / Besley, Elena / Champness, Neil R

    Chemical science

    2019  Volume 10, Issue 13, Page(s) 3723–3732

    Abstract: A strategy for positioning, and loosely connecting, molecules in close proximity using mechanically interlocked handcuffs is described. The strategy is demonstrated using rylene diimides, creating dimeric structures in which two components are linked ... ...

    Abstract A strategy for positioning, and loosely connecting, molecules in close proximity using mechanically interlocked handcuffs is described. The strategy is demonstrated using rylene diimides, creating dimeric structures in which two components are linked through pillar[5]arene/imidazolium rotaxanes. Investigation of the resulting molecules demonstrates intriguing and new properties that arise from placing these redox active dye molecules together, allowing interactions, whilst allowing the molecules to separate as required. In particular we observe excimer emission from a perylene diimide dimer handcuff and the formation of an unusual radical anion π-dimer upon double reduction of the same molecule. The latter exhibits a unique visible absorption profile for a PDI-based molecule. We demonstrate the flexibility of our approach by making an unprecedented mixed perylene diimide/naphthalene diimide dimer which also reveals interactions between the two components. Our synthetic strategy facilitates the creation of unusual dimeric structures and allows the investigation of intermolecular interactions and the effects they have on electronic and magnetic properties.
    Language English
    Publishing date 2019-02-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 2559110-1
    ISSN 2041-6539 ; 2041-6520
    ISSN (online) 2041-6539
    ISSN 2041-6520
    DOI 10.1039/c9sc00167k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Thionated perylene diimides with intense absorbance in the near-IR.

    Llewellyn, Ben A / Davies, E Stephen / Pfeiffer, Constance R / Cooper, Mick / Lewis, William / Champness, Neil R

    Chemical communications (Cambridge, England)

    2016  Volume 52, Issue 10, Page(s) 2099–2102

    Abstract: A synthetic strategy involving a combination of tetra-thionation and amine substitution in the bay region of a perylene diimide (PDI) leads to remarkable examples of neutral PDIs with intense absorption maxima in the near infrared. Generation of the ... ...

    Abstract A synthetic strategy involving a combination of tetra-thionation and amine substitution in the bay region of a perylene diimide (PDI) leads to remarkable examples of neutral PDIs with intense absorption maxima in the near infrared. Generation of the corresponding monoanions red shifts the absorption profile to give short-wavelength infrared bands.
    Language English
    Publishing date 2016-02-04
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1472881-3
    ISSN 1364-548X ; 1359-7345 ; 0009-241X
    ISSN (online) 1364-548X
    ISSN 1359-7345 ; 0009-241X
    DOI 10.1039/c5cc09962e
    Database MEDical Literature Analysis and Retrieval System OnLINE

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