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  1. Article: Cyanido-bridged diplatinum(ii) complexes: ligand and solvent effect on aggregation and luminescence.

    Khistiaeva, Viktoria V / Buss, Stefan / Eskelinen, Toni / Hirva, Pipsa / Kinnunen, Niko / Friedel, Joshua / Kletsch, Lukas / Klein, Axel / Strassert, Cristian A / Koshevoy, Igor O

    Chemical science

    2024  Volume 15, Issue 11, Page(s) 4005–4018

    Abstract: The association of platinum(ii)-based luminophores, which is caused by metal⋯metal and π-π stacking interactions, has been actively exploited in supramolecular construction of photofunctional molecular materials. Herein, we describe a series of ... ...

    Abstract The association of platinum(ii)-based luminophores, which is caused by metal⋯metal and π-π stacking interactions, has been actively exploited in supramolecular construction of photofunctional molecular materials. Herein, we describe a series of bimetallic complexes [{Pt(C^N^
    Language English
    Publishing date 2024-02-12
    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/d3sc06941a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Isoelectronic Pt(II) complexes of cyclometalating C^N^N ligands with phenyl/(benzo)thiophenyl and pyridyl/(benzo)thiazolyl moieties.

    Krause, Maren / Friedel, Joshua / Buss, Stefan / Brünink, Dana / Berger, Annemarie / Strassert, Cristian A / Doltsinis, Nikos L / Klein, Axel

    Dalton transactions (Cambridge, England : 2003)

    2022  Volume 51, Issue 42, Page(s) 16181–16194

    Abstract: A series of cyclometalated Pt(II) complexes [Pt(C^N^N)X] (X = Cl, CCPh, C ... ...

    Abstract A series of cyclometalated Pt(II) complexes [Pt(C^N^N)X] (X = Cl, CCPh, CCC
    Language English
    Publishing date 2022-11-01
    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/d2dt02688k
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Triplet Emitting C^N^C Cyclometalated Dibenzo[c,h]Acridine Pt(II) Complexes.

    Friedel, Joshua / Krause, Maren / Jordan, Rose / Maisuls, Iván / Brünink, Dana / Schwab, Dominik / Doltsinis, Nikos L / Strassert, Cristian A / Klein, Axel

    Molecules (Basel, Switzerland)

    2022  Volume 27, Issue 22

    Abstract: In a series of Pt(II) complexes [Pt(dba)(L)] containing the very rigid, dianionic, bis-cyclometalating, tridentate C^N^C2− heterocyclic ligand dba2− (H2dba = dibenzo[c,h]acridine), the coligand (ancillary ligand) L = dmso, PPh3, CNtBu and Me2Imd (N,N’- ... ...

    Abstract In a series of Pt(II) complexes [Pt(dba)(L)] containing the very rigid, dianionic, bis-cyclometalating, tridentate C^N^C2− heterocyclic ligand dba2− (H2dba = dibenzo[c,h]acridine), the coligand (ancillary ligand) L = dmso, PPh3, CNtBu and Me2Imd (N,N’-dimethylimidazolydene) was varied in order to improve its luminescence properties. Beginning with the previously reported dmso complex, we synthesized the PPh3, CNtBu and Me2Imd derivatives and characterized them by elemental analysis, 1H (and 31P) NMR spectroscopy and MS. Cyclic voltammetry showed partially reversible reduction waves ranging between −1.89 and −2.10 V and increasing along the series Me2Imd < dmso ≈ PPh3 < CNtBu. With irreversible oxidation waves ranging between 0.55 (L = Me2Imd) and 1.00 V (dmso), the electrochemical gaps range between 2.65 and 2.91 eV while increasing along the series Me2Imd < CNtBu < PPh3 < dmso. All four complexes show in part vibrationally structured long-wavelength absorption bands peaking at around 530 nm. TD-DFT calculated spectra agree quite well with the experimental spectra, with only a slight redshift. The photoluminescence spectra of all four compounds are very similar. In fluid solution at 298 K, they show broad, only partially structured bands, with maxima at around 590 nm, while in frozen glassy matrices at 77 K, slightly blue-shifted (~580 nm) bands with clear vibronic progressions were found. The photoluminescence quantum yields ΦL ranged between 0.04 and 0.24, at 298 K, and between 0.80 and 0.90 at 77 K. The lifetimes τ at 298 K ranged between 60 and 14040 ns in Ar-purged solutions and increased from 17 to 43 µs at 77 K. The TD-DFT calculated emission spectra are in excellent agreement with the experimental findings. In terms of high ΦL and long τ, the dmso and PPh3 complexes outperform the CNtBu and Me2Imd derivatives. This is remarkable in view of the higher ligand strength of Me2Imd, compared with all other coligands, as concluded from the electrochemical data.
    Language English
    Publishing date 2022-11-19
    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/molecules27228054
    Database MEDical Literature Analysis and Retrieval System OnLINE

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