Gutenberg Open Science

The Open Science Repository of Johannes Gutenberg University Mainz.

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Recent Submissions

  • Item type:Item, ZeitschriftenaufsatzAccess status: Open Access ,
    Stability vs. activity in electrocatalytic hydrogen production and magnetic studies of mononuclear labile Cu(ii) and Ni(ii) complexes
    (2026)
    Bhatti, Maria A.
    ;
    Carrella, Luca M.
    ;
    Streb, Carsten
    ;
    Rentschler, Eva
    ;
    Sundaresan, Sriram
    In this study, two new mononuclear Schiff base salen-derived complexes, [CuII(H2LMe)]·1.5H2O (C1) and [NiII(H2LMe)]·3H2O (C2), were prepared from 2,6-bis(hydroxymethyl)-4-methylphenol H4L and characterised by single crystal X-ray diffractometry, infrared spectroscopy and elemental analysis. Electrochemical studies in DMF with acetic acid as a proton source revealed catalytic hydrogen evolution activity for both complexes, with C1 displaying higher activity, lower overpotential (η = 0.71 V), and a higher TOFmax of 452 029 s−1 compared to C2 (η = 0.89 V, TOFmax = 986 s−1). The stability of the compounds was tested via controlled potential electrolysis (CPE) and rinse tests, indicating partial heterogeneous contributions to catalysis from electrode-deposited species. These deposits were further analysed by SEM and EDX. To rule out the possibility of nanoparticle formation, dynamic light scattering DLS analysis was performed.
  • Item type:Item, ZeitschriftenaufsatzAccess status: Open Access ,
    Coacervate microenvironments modulate fluorescent dye behaviour and Förster energy transfer dynamics
    (2026)
    Kumar, Mohit
    ;
    Kapidžić, Minea
    ;
    Dhiman, Shikha
    Coacervates offer dynamic environments for molecular organization. Using complex coacervates of poly-l-lysine and anionic fluorophores, we show that the coacervate microenvironment modulates dye photophysical properties through competing effects: fluorescence enhancement via local enrichment and aggregation-induced quenching at higher loading, while enabling energy transfer. These insights establish coacervates as versatile templates for designing adaptive nanoscale photonic and energy-transfer materials.
  • Item type:Item, DissertationAccess status: Open Access ,