• Home
  • Ulm University
  • Institute of Inorganic Chemistry I (Materials and Catalysis)
  • Andrea Pannwitz
Andrea Pannwitz

Andrea Pannwitz
Ulm University | UULM · Institute of Inorganic Chemistry I (Materials and Catalysis)

PhD

About

36
Publications
2,593
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
242
Citations
Introduction
Photochemistry, light-driven catalysis and self-assembly with molecules and membranes.
Additional affiliations
March 2020 - September 2021
Ulm University
Position
  • Group Leader
September 2017 - February 2020
Leiden University
Position
  • PostDoc Position
June 2017 - August 2017
University of Basel
Position
  • PostDoc Position

Publications

Publications (36)
Article
Lichtgetriebene homogene und heterogene Katalyse erfordern ein komplexes Zusammenspiel von Lichtabsorption, Ladungstrennung, Ladungstransfer und katalytischem Umsatz. Optische und Bestrahlungsparameter sowie reaktionstechnische Aspekte spielen eine wichtige Rolle bei der Kontrolle der katalytischen Leistung. Diese Vielzahl von Faktoren erschwert de...
Article
Light‐driven homogeneous and heterogeneous catalysis require a complex interplay between light absorption, charge separation, charge transfer, and catalytic turnover. Optical and irradiation parameters as well as reaction engineering aspects play major roles in controlling catalytic performance. This multitude of factors makes it difficult to objec...
Article
Light-driven conversion of CO2 to chemicals provides a sustainable alternative to fossil fuels, but homogeneous systems are typically limited by cross reactivity between different redox half reactions and inefficient charge separation. Herein, we present the bioinspired development of amphiphilic photosensitizer and catalyst pairs that self-assembl...
Article
Six different monoarylated N‐aryl‐1 H ‐imidazo[4,5‐ f ][1,10]phenanthroline (Rip) ligands and their corresponding ruthenium complexes [(tbbpy) 2 Ru(Rip)] 2+ Ru(Rip) have been synthesized bearing different aryl substituents on the imidazole unit including electron donating and accepting groups. N,N’‐disubstitution on the imidazole unit yielded five...
Article
Die Aufklärung von Reaktionsmechanismen ist in der Katalyse wichtig, um die geschwindigkeitsbegrenzende Schritte zu verstehen und zu beschleunigen. Mit maschinellem Lernen lassen dann sich auf Basis der Mechanismen neue Katalysatoren entwickeln. Photochemische Umsetzungen in weichen Membranen folgen einer anderen Kinetik als Reaktionen in Lösung. M...
Article
Reproducibility and comparability of photocatalytic experiments are still challenging, owing to the large number of experimental parameters and their comprehensive documentation. To overcome this limitation, a modular, adaptable, and extensible photoreactor platform is reported, which enables experiments under well‐characterized, reproducible condi...
Article
Full-text available
Pigments of fungi are a fertile ground of inspiration: they spread across various chemical backbones, absorption ranges, and bioactivities. However, basidiomycetes with strikingly colored fruiting bodies have never been explored as agents for photodynamic therapy (PDT), even though known photoactive compound classes (e.g., anthraquinones or alkaloi...
Article
Covalent functionalisation with alkyl tails is a common method for supporting molecular catalysts and photosensitisers onto lipid bilayers, but the influence of the alkyl chain length on the photocatalytic performances of the resulting liposomes is not well understood. In this work we functionalised PEGylated DPPC liposomes (hereafter noted Cn) wit...
Article
Full-text available
Lipid bilayer membranes are ubiquitous in natural chemical conversions. They enable for self‐assembly and compartmentalization of reaction partners and it becomes increasingly evident that a thorough fundamental understanding of these concepts is highly desirable for chemical reactions and solar energy conversion with artificial systems. This minir...
Article
Full-text available
Artificial photosynthesis has experienced rapid developments aimed at producing photocatalytic systems for the synthesis of chemical energy carriers. Conceptual advances of solar fuel systems have been inspired by improved understanding of natural photosynthesis and its key operational principles: (a) light harvesting, (b) charge separation, (c) di...
Article
Full-text available
Invited for the cover of this issue are Andrea Pannwitz, Sylvestre Bonnet and co‐workers at Leiden University and Johns Hopkins University. The image depicts an observer watching over a lipid bilayer “landscape” and a sky full of luminescent giant vesicles. Read the full text of the article at 10.1002/chem.202003391. “In this study we designed and...
Preprint
Full-text available
p> Pigments of mushrooms are a fertile ground of inspiration: they spread across various chemical backbones, absorption ranges, and bioactivities. While looking from a photochemical perspective, we discovered a new bioactivity, i.e., photoactivity. We revealed that singlet oxygen production is a common theme in one group of webcaps (i.e., dermocybo...
Article
Full-text available
Photosystem I (PS I) is a transmembrane protein that assembles perpendicular to the membrane, and performs light harvesting, energy transfer, and electron transfer to a final, water‐soluble electron acceptor. We present here a supramolecular model of it formed by a bicationic oligofluorene 12+ bound to the bisanionic photoredox catalyst eosin Y (EY...
Article
Full-text available
The inverse electron demand Diels-Alder pyridazine elimination reaction between tetrazines and allylic substituted trans -cyclooctenes (TCOs) is a key player in bioorthogonal bond cleavage reactions. Determining the rate of elimination on alkylamine substrates has so far proven difficult. Here, we report a fluorogenic tool consisting of a TCO-linke...
Article
Mechanistic investigations of proton-coupled electron transfer (PCET) are increasingly important, especially in the context of small molecule activation and solar energy conversion. The main part of this invited Perspective discusses 16 mechanistic PCET studies published over the past 5 years that contributed significantly to understanding and cont...
Article
Full-text available
The conversion of CO 2 , H 2 O, or N 2 to energy-rich compounds such as CH 3 OH, H 2 or NH 3 requires the properly orchestrated transfer of multiple electrons and protons. Artificial photosynthetic systems therefore must be able to synchronize the rapid primary photoinduced transfer of single electrons to the slower catalytic (multi-electron) turno...
Cover Page
Full-text available
The Front Cover shows a streptavidin molecule functionalized with a light‐sensitive Ru–polypyridyl complex via a bis‐biotin ligand. One biotin is free and strongly interacts with the protein pocket, while the other is coordinated to ruthenium to hold the complex onto the protein in the dark. Upon blue light irradiation, the bond between the coordin...
Article
Invited for the cover of this issue is the group of Sylvestre Bonnet from Leiden University, The Netherlands. The cover image shows the attachment of a free biotin group to a Ru compound by a light‐sensitive coordination bond. Triggering the reactivity of a molecule with a light beam from outside the flask without introducing any other chemical is...
Article
Full-text available
In this work the synthesis, photochemistry, and streptavidin interaction of new [Ru(tpy)(bpy)(SRR')](PF6)2 complexes where the R' group contains a free biotin ligand, are described. Two different ligands SRR' were investigated: An asymmetric ligand 1 where the Ru‐bound thioether is an N‐acetylmethionine moiety linked to the free biotin fragment via...
Article
Full-text available
A new family of compact and chiral M(II) bis(terpyridine) complexes is presented. The peripheral decoration of the terpyridine ligand system with ortho-ethynylphenyl substituents in 4 and 4’’ positions enables the macrocyclization of the ligand system upon complexation by oxidative acetylene coupling, resulting in a helical chiral arrangement of th...
Article
Two luminescent heteroleptic Ru(II) complexes with a 2,2'‐biimidazole (biimH2) ligand form doubly hydrogen‐bonded salt bridges to 4‐sulfobenzoate anions in single crystals. The structure of one of these cation‐anion adducts shows that the biimH2 ligand is deprotonated. Its 3MLCT luminescence bands does not shift significantly under the influence of...
Article
Long-lived photo-driven charge separation is demonstrated by assembling a triad on a protein scaffold. For this purpose, a biotinylated triarylamine was added to a Ru(II)- streptavidin conjugate bearing a methyl viologen electron acceptor covalently linked to the N-terminus of streptavidin. To improve the rate and lifetime of the electron transfer...
Article
The first artificial donor–sensitizer–acceptor compound in which photoinduced long-range electron transfer is coupled to donor deprotonation and acceptor protonation is reported. The long-lived photoproduct stores energy in the form of a radical pair state in which the charges of the donor and the acceptor remain unchanged, much in contrast to prev...
Article
Efficient catalysts for water oxidation are key to all scenarios for artificial solar water splitting, and in case of molecular catalysts their immobilization on conductive solid supports is considered essential for the construction of a photoelectrochemical cell. In this work, derivatives of the rugged 3,5-bis(bipyridyl)pyrazolate (bbp) based diru...
Article
Complexes of the type [Ru(bpy)2pyimH]2+ [bpy = 2,2′-bipyridine; pyimH = 2-(2-pyridyl)imidazole] with various substituents on the bpy ligands can act as photoreductants. Their reducing power in the ground state and in the long-lived 3MLCT excited state is increased significantly upon deprotonation, and they can undergo proton-coupled electron transf...
Article
Electron transfer from a biotinylated electron donor to photochemically generated Ru(iii) complexes covalently anchored to streptavidin is demonstrated by means of time-resolved laser spectroscopy. Through site-selective mutagenesis, a single cysteine residue was engineered at four different positions on streptavidin, and a Ru(ii) tris-diimine comp...
Article
Full-text available
Proton coupled electron transfer (PCET) from the excited state of [Ru(bpy)2pyimH]2+ (bpy = 2,2′-bipyridine; pyimH = 2-(2′-pyridyl)imidazole) to N-methyl-4,4′-bipyridinium (monoquat, MQ+) was studied. While this complex has been investigated previously, our study is the first to show that the formal bond dissociation free energy (BDFE) of the imidaz...
Conference Paper
Full-text available
After the first ever Basel Chemistry Symposium (BCS) held in 2013, the 2nd annual BCS took place on the 23rd of May, 2014. The Symposium was dedicated to Prof. Dr. Tadeus Reichstein, who made significant contributions to the Chemistry Department of the University of Basel, not only of scientific nature, but also in the development of the Department...

Network

Cited By