Kara Bren

@karabren.bsky.social

Chemistry Professor, University of Rochester, USA. Proud PI of @BrenLab.bsky.social

4th PhD defense in the Bren Lab this year!! 🎓 Congratulations to Dr. Kaye Kuphal on her successful defense today! We wish her all the very best in her future endeavors and everything that lies ahead. 🤠🍾🎉

Bild

Cheers to Ryan on an incredible defense! One of our amazing mentors and an OG photochemist of the lab! Wishing you all the best for everything that comes next!🥳🥂✨

BildBild

Now official: we’re looking for postdocs for 2026 and beyond. If you want to use your synbio skills and the growing Microbe-Mineral Atlas to build cutting-edge biomining technologies read more below: docs.google.com/document/d/1... And apply here: academicjobsonline.org/ajo/jobs/30906

Cornell University, BEE/CALS

Job #AJO30906, WDR-00055535 Postdoctoral Associate Sustainable Energy and Synthetic Biology, BEE/CALS, Cornell University, Ithaca, New York, US

academicjobsonline.org

Cheering on Hafsa Irfan for her summer internship at Biogen, North Carolina, where she contributed to drug development and analysis. Way to go Hafsa!! 👏👩‍🔬

Bild

My quote of the day Throughout history, it has been the inaction of those who could have acted; the indifference of those who should have known better; the silence of the voice of justice when it mattered most; that has made it possible for evil to triumph. Haile Selassie

I am thrilled to share this paper from my group that is just out in ACS Electrochemistry. We study factors that impact the temperature sensitivity of redox potentials in iron complexes. You can read about it here (it is open access): pubs.acs.org/doi/10.1021/...

Effect of Coordination Environment and Electronic Coupling on Redox Entropy in a Family of Dinuclear Complexes

The elucidation of factors that govern the temperature sensitivity of the electrochemical potential is essential to the development of electrochemical systems with target properties. Toward this end, we report a series of isostructural homo- and heterometallic M2 (M = FeII, FeIII, ZnII) complexes supported by a phenoxo-centered tetrapyridyl ligand and ancillary carboxylate ligands that enables independent change in (i) charge, (ii) coordination environment of the redox-active center(s), and (iii) electronic coupling strength between redox centers. Variable-temperature electrochemical analysis of the series reveals the temperature coefficient for Fe-based redox couples to be highly dependent on the coordination environment of the redox-active center(s), with Fe centers in a pseudo-octahedral [FeN3O3] coordination environment affording a 2-fold greater temperature coefficient for the FeIII/FeII redox couple than those in ancillary ferrocenyl groups. In contrast, identical temperature coefficients for the FeIII/FeII redox event in Fe2 and FeZn complexes establish electronic coupling strength to have a minimal impact on the temperature dependence of the Fe-based redox couple. Taken together, these results provide important insights for the design of molecular compounds with target redox properties, and they provide the first examination of how electronic coupling influences the temperature dependence of the redox potential and the associated redox entropy in molecular compounds.

pubs.acs.org

Write to your Congress-critters and Senators today (especially in red states) and urge them to contact the White House and let them know your thoughts. Mine are that the purge yesterday likely did considerable damage to the US biomedical research and public health capacity. con'ted 3/n