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DatensammlungAccess status: Open Access ,
Raw data for "When less is more: harnessing optimal quencher concentrations to maximize quantum yields in TADF photoredox reactions"
(2026)
Fina, Federica
;
Schmitz, Matthias
;
Bertrams, Maria-Sophie
;
Bellatreccia, Caterina
;
Burdenski, Chris
Here, we report a counterintuitive “less is more” effect, in which lower quencher concentrations improve overall quantum yields in photoinduced electron transfer - key reaction steps in organic photoredox catalysis. This behavior arises because lower quencher concentrations favor quenching of the triplet rather than the singlet excited state. In the latter undesired case, lower efficiencies for free radical or radical ion formation following electron transfer are generally expected, due to reduced cage escape (i.e., separation of geminate radical pairs before recombination). This less productive pathway kinetically competes with the more productive triplet channel. Using nanosecond transient absorption spectroscopy, we directly quantified state-specific cage escape efficiencies and incorporated them into a model to predict radical production quantum yields across different quencher concentration regimes. Additionally, we assessed how the TADF-specific photophysical properties contribute to the observed behavior and examined how these processes translate into catalytic efficiency under continuous irradiation. In contrast to expectations derived from conventional emission quenching experiments, our results clearly demonstrate - across four photocatalyst-quencher systems and three solvents spanning a wide polarity range - that dilution of a reaction system or avoiding a quencher excess can greatly improve the achievable reaction quantum yields in photoredox catalysis. This behavior is not only demonstrated by quantitative transient absorption spectroscopy but also by an initial lab-scale photocatalysis experiment. These findings have important implications in the context of maximizing quantum yields of photoreactions, which is essential for enabling competitive applications on a larger scale.
ZeitschriftenaufsatzAccess status: Open Access ,
Mental load in women and mothers : causes of distress, personality traits, and psychopathology
(2026)
Jungmann, Stefanie M.
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Garbe Huedo, Stella F.
;
Jacobs, Karlotta A. S.
;
Pothorn, Nina K.
Mental load has received increasing public attention, particularly following societal changes such as the COVID-19 pandemic and shifts toward greater gender equality. However, despite its societal relevance, it remains comparatively under-researched. Following a literature review on mental load, two cross-sectional online survey studies systematically examined the burden of invisible (mental load) versus visible household and caregiving work, the causes of this burden, and associations with personality traits and psychological symptoms (affect, anxiety, depressiveness). Participants were recruited online via university mailing lists, social media, and parent forums. In Study 1 (N = 368 women; M = 35.98 years, SD = 8.87), it was found that mothers (vs. women without children) perceived invisible tasks such as planning or organizing significantly more stressful and unequally distributed compared to visible tasks. Mental load was significantly negatively related to positive affect and significantly positively related to negative affect, anxiety, and depressive symptoms. In both studies, constantly thinking about tasks and the perception that tasks never appear to be completed were cited as the most common causes of mental load. The results of Study 2 (N = 1891 mothers; M = 38.18 years, SD = 5.18) showed that mental load is positively related to neuroticism and conscientiousness, with the association of mental load and neuroticism moderated by being a single mother. Practical implications at the individual, couple, and societal levels are derived from these findings.
ZeitschriftenaufsatzAccess status: Open Access ,
Drive or Trauma – Drive and Trauma (Ilse Grubrich-Simitis) revisited : even more relevant than four decades ago
(2026)
Leuzinger-Bohleber, Marianne
;
Krakau, Lina
After the sad death of our colleague Ilse Grubrich-Simitis, one aim of this paper is to revisit one of her groundbreaking works, “Drive or Trauma – Drive and Trauma” (1987) after almost 40 years. Grubrich-Simitis integrated drive and object relational aspects on the one hand and trauma-specific perspectives on the other in a creative way, as we discuss regarding some conceptual developments in contemporary psychoanalysis. A short case example illustrates the conceptual richness for treating chronically depressed patients with early trauma available to clinicians today. Considering both drive and trauma belongs to the strengths of modern psychoanalytic treatment techniques, which we would like to discuss alongside recent findings of the LACFootnote1 depression study [Comparative outcome study of psychoanalytic and cognitive behavioral long-term psychotherapy with chronically depressed patients], indicating that these difficult-to-treat patients profit especially well from psychoanalysis.