TY - JOUR
AB - The use of iron as a replacement for noble metals in photochemical and photophysical applications is challenging due to the typically fast deactivation of short-lived catalytically active states. Recent success of a cyclometalated iron(III) complex utilizing a bis-tridentate ligand motif inspired the use of phenyl-1H-pyrazole as a bidentate ligand. Five complexes using the tris(1-phenylpyrazolato-N,C2)iron(III) complex scaffold are presented. In addition to the parent complex, four derivatives with functionalization in the meta-position of the phenyl ring are thoroughly investigated by single crystal diffractometry, UV-Vis-spectroscopy, and cyclic voltammetry. Advanced X-ray spectroscopy in the form of X-ray absorption and emission spectroscopy allows unique insights into the electronic structure as well as DFT calculations. The ligand design leads to overlapping MLCT and LMCT absorption bands, and emissive behavior is suppressed by low-lying MC states.
AU - Hirschhausen, Tanja
AU - Fritsch, Lorena
AU - Lux, Franziska
AU - Steube, Jakob
AU - Schoch, Roland
AU - Neuba, Adam
AU - Egold, Hans
AU - Bauer, Matthias
ID - 46548
IS - 7
JF - Inorganics
KW - Inorganic Chemistry
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
KW - pc2-ressources
SN - 2304-6740
TI - Iron(III)-Complexes with N-Phenylpyrazole-Based Ligands
VL - 11
ER -
TY - JOUR
AU - Rogolino, Andrea
AU - Filho, José B. G.
AU - Fritsch, Lorena
AU - Ardisson, José D.
AU - da Silva, Marcos A. R.
AU - Atta Diab, Gabriel Ali
AU - Silva, Ingrid Fernandes
AU - Moraes, Carlos André Ferreira
AU - Forim, Moacir Rossi
AU - Bauer, Matthias
AU - Kühne, Thomas D.
AU - Antonietti, Markus
AU - Teixeira, Ivo F.
ID - 46547
IS - 13
JF - ACS Catalysis
KW - Catalysis
KW - General Chemistry
KW - pc2-ressources
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
SN - 2155-5435
TI - Direct Synthesis of Acetone by Aerobic Propane Oxidation Promoted by Photoactive Iron(III) Chloride under Mild Conditions
VL - 13
ER -
TY - JOUR
AB - Photoactive chromium(III) complexes saw a conceptual breakthrough with the discovery of the prototypical molecular ruby mer-[Cr(ddpd)2]3+ (ddpd = N,N′-dimethyl-N,N′-dipyridin-2-ylpyridine-2,6-diamine), which shows intense long-lived near-infrared (NIR) phosphorescence from metal-centered spin-flip states. In contrast to the numerous studies on chromium(III) photophysics, only 10 luminescent molybdenum(III) complexes have been reported so far. Here, we present the synthesis and characterization of mer-MoX3(ddpd) (1, X = Cl; 2, X = Br) and cisfac-[Mo(ddpd)2]3+ (cisfac-[3]3+), an isomeric heavy homologue of the prototypical molecular ruby. For cisfac-[3]3+, we found strong zero-field splitting using magnetic susceptibility measurements and electron paramagnetic resonance spectroscopy. Electronic spectra covering the spin-forbidden transitions show that the spin-flip states in mer-1, mer-2, and cisfac-[3]3+ are much lower in energy than those in comparable chromium(III) compounds. While all three complexes show weak spin-flip phosphorescence in NIR-II, the emission of cisfac-[3]3+ peaking at 1550 nm is particularly low in energy. Femtosecond transient absorption spectroscopy reveals a short excited-state lifetime of 1.4 ns, 6 orders of magnitude shorter than that of mer-[Cr(ddpd)2]3+. Using density functional theory and ab initio multireference calculations, we break down the reasons for this disparity and derive principles for the design of future stable photoactive molybdenum(III) complexes.
AU - Kitzmann, Winald R.
AU - Hunger, David
AU - Reponen, Antti-Pekka M.
AU - Förster, Christoph
AU - Schoch, Roland
AU - Bauer, Matthias
AU - Feldmann, Sascha
AU - van Slageren, Joris
AU - Heinze, Katja
ID - 52345
IS - 39
JF - Inorganic Chemistry
KW - Inorganic Chemistry
KW - Physical and Theoretical Chemistry
SN - 0020-1669
TI - Electronic Structure and Excited-State Dynamics of the NIR-II Emissive Molybdenum(III) Analogue to the Molecular Ruby
VL - 62
ER -
TY - JOUR
AB - Macrocyclization reactions are still challenging due to competing oligomerization, which requires the use of small substrate concentrations. Here, the cationic tungsten imido and tungsten oxo alkylidene N-heterocyclic carbene complexes [[W(N-2,6-Cl2-C6H3)(CHCMe2Ph(OC6F5)(pivalonitrile)(IMes)+ B(ArF)4−] (W1) and [W(O)(CHCMe2Ph(OCMe(CF3)2)(IMes)(CH3CN)+ B(ArF)4−] (W2) (IMes=1,3-dimesitylimidazol-2-ylidene; B(ArF)4−=tetrakis(3,5-bis(trifluoromethyl)phenyl borate) have been immobilized inside the pores of ordered mesoporous silica (OMS) with pore diameters of 3.3 and 6.8 nm, respectively, using a pore-selective immobilization protocol. X-ray absorption spectroscopy of W1@OMS showed that even though the catalyst structure is contracted due to confinement by the mesopores, both the oxidation state and structure of the catalyst stayed intact upon immobilization. Catalytic testing with four differently sized α,ω-dienes revealed a dramatically increased macrocyclization (MC) and Z-selectivity of the supported catalysts compared to the homogenous progenitors, allowing high substrate concentrations of 25 mM. With the supported complexes, a maximum increase in MC-selectivity from 27 to 81 % and in Z-selectivity from 17 to 34 % was achieved. In general, smaller mesopores exhibited a stronger confinement effect. A comparison of the two supported tungsten-based catalysts showed that W1@OMS possesses a higher MC-selectivity, while W2@OMS exhibits a higher Z-selectivity which can be rationalized by the structures of the catalysts.
AU - Ziegler, Felix
AU - Bruckner, Johanna R.
AU - Nowakowski, Michal
AU - Bauer, Matthias
AU - Probst, Patrick
AU - Atwi, Boshra
AU - Buchmeiser, Michael R.
ID - 52344
IS - 21
JF - ChemCatChem
KW - Inorganic Chemistry
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Catalysis
SN - 1867-3880
TI - Macrocyclization of Dienes under Confinement with Cationic Tungsten Imido/Oxo Alkylidene N‐Heterocyclic Carbene Complexes
VL - 15
ER -
TY - JOUR
AB - The effects of backbone amine functionalization in three new homoleptic C^N^C type ruthenium(II) complexes bearing a tridentate bis‐imidazole‐2‐ylidene pyridine ligand framework are characterized and studied by single crystal diffraction, electrochemistry, optical spectroscopy and transient absorption spectroscopy in combination with ab initio DFT calculations. Functionalization by dimethylamine groups in 4‐position of the pyridine backbone significantly influences the properties of the complexes as revealed by comparison with the unfunctionalized references. As a result of the amine functionalization, a higher molar absorption coefficient of the MLCT bands, a decreased photoluminescence quantum yield at room temperature together with a shortened excited state lifetime but an improved photostability is observed. Introduction of electron donating and withdrawing groups at the NHC unit modifies the electronic and optical properties, such as the oxidation potential, absorption and emission properties, and the lifetimes of the excited states.
AU - Fritsch, Lorena
AU - Vukadinovic, Yannik
AU - Lang, Moritz
AU - Naumann, Robert
AU - Bertrams, Maria-Sophie
AU - Kruse, Ayla
AU - Schoch, Roland
AU - Müller, Patrick
AU - Neuba, Adam
AU - Dierks, Philipp
AU - Lochbrunner, Stefan
AU - Kerzig, Christoph
AU - Heinze, Katja
AU - Bauer, Matthias
ID - 49608
JF - ChemPhotoChem
KW - Organic Chemistry
KW - Physical and Theoretical Chemistry
KW - Analytical Chemistry
KW - Computing Resources Provided by the Paderborn Center for Parallel Computing
KW - pc2-ressources
SN - 2367-0932
TI - Chemical and photophysical properties of amine functionalized bis‐NHC‐pyridine‐RuII complexes
ER -
TY - GEN
AU - Beutner, Marc
AU - Schneider, Jennifer Nicole
ID - 47901
T2 - International Conference on Industry Sciences and Computer Science Innovation
TI - The use of IT and OER to support remote sustainable work in Europeans Green Economy
ER -
TY - CHAP
AU - Schwede, Jana
AU - Harteis, Christian
ED - Müller, Claudia
ED - Pranger, Jan
ED - Reißland, Jens
ID - 52330
T2 - Nachhaltigkeitsorientierte Weiterbildungsdidaktik: Die doppelte Multiplikatorenqualifizierung
TI - Weiterbildung des Weiterbildungspersonals – Vorwiegend eine Aufgabe des Lernens am Arbeitsplatz
VL - 73
ER -
TY - JOUR
AU - Diederich, Malte
AU - Spatz, Verena
AU - Bauer, Anna Brigitte
ID - 52358
JF - Phydid B, Didaktik der Physik, Beiträge zur DPG-Frühjahrstagung (2022)
TI - Auswirkungen einer Online-Intervention (Mindset, Lerntechniken) auf den Studieneinstieg
ER -
TY - CONF
AB - Megatrends, such as digitization or sustainability, are confronting the product management of manufacturing companies with a variety of challenges regarding the design of future products, but also the management of the actual products. To successfully position their products in the market, product managers need to gather and analyze comprehensive information about customers, developments in the products’ environment, product usage, and more. The digitization of all aspects of life is making data on these topics increasingly available – via social media, documents, or the internet of things from the products themselves. The systematic collection and analysis of these data enable the exploitation of new potentials for the adaption of existing products and the creation of the products of tomorrow. However, there are still no insights into the main concepts and cause-effect relationships in exploiting data-driven approaches for product management. Therefore, this paper aims to identify the main concepts and advantages of data-driven product management. To answer the corresponding research questions a comprehensive systematic literature review is conducted. From its results, a detailed description of the main concepts of data-driven product management is derived. Furthermore, a taxonomy for the advantages of data-driven product management is presented. The main concepts and the taxonomy allow for a deeper understanding of the topic while highlighting necessary future actions and research needs.
AU - Fichtler, Timm
AU - Grigoryan, Khoren
AU - Koldewey, Christian
AU - Dumitrescu, Roman
ID - 52369
KW - Product Lifecyle Management (PLM)
KW - Data Analytics
KW - Data-driven Design
KW - Engineering Management
KW - Lifecycle Data
T2 - 2023 IEEE International Conference on Technology Management, Operations and Decisions (ICTMOD)
TI - Towards a Data-Driven Product Management – Concepts, Advantages, and Future Research
ER -
TY - GEN
AU - Vernholz, Mats
ED - Perla, Loredana
ED - Agrati, Laura Sara
ED - Vinci, Viviana
ED - Scarinci, Alessia
ID - 52370
SN - 9791255681038
T2 - Living and Leading in the Next Era: Connecting Teaching, Research, Citizenship and Equity
TI - Academic self-concepts of pre-service technology teachers for vocational education in Germany according to the TPACK- Model
ER -