Search results for: Michael R. Wasielewski

Items from 1 to 20 out of 193 results

article

Challenges in the Direct Detection of Chirality‐induced Spin Selectivity: Investigation of Foldamer‐based Donor‐acceptor Dyads

Alberto Privitera, Davide Faccio, Demetra Giuri, Elisabeth I. Latawiec, more

Chemistry – A European Journal > 29 > 69 > n/a - n/a

Over the past two decades, the chirality‐induced spin selectivity (CISS) effect was reported in several experiments disclosing a unique connection between chirality and electron spin. Recent theoretical works highlighted time‐resolved Electron Paramagnetic Resonance (trEPR) as a powerful tool to directly detect the spin polarization resulting from CISS. Here, we report a first attempt to detect CISS...

article

Evidence of a Uranium‐Paddlewheel Node in a Catecholate‐Based Metal–Organic Framework

Julia G. Knapp, Xijun Wang, Andrew S. Rosen, Xingjie Wang, more

Angewandte Chemie > 135 > 29 > n/a - n/a

The interactions between uranium and non‐innocent organic species are an essential component of fundamental uranium redox chemistry. However, they have seldom been explored in the context of multidimensional, porous materials. Uranium‐based metal–organic frameworks (MOFs) offer a new angle to study these interactions, as these self‐assembled species stabilize uranium species through immobilization...

article

Evidence of a Uranium‐Paddlewheel Node in a Catecholate‐Based Metal–Organic Framework

Julia G. Knapp, Xijun Wang, Andrew S. Rosen, Xingjie Wang, more

Angewandte Chemie International Edition > 62 > 29 > n/a - n/a

article

Optical Spin Polarization of a Narrow‐Linewidth Electron‐Spin Qubit in a Chromophore/Stable‐Radical System

Yunfan Qiu, Asif Equbal, Chenjian Lin, Yuheng Huang, more

Angewandte Chemie International Edition > 62 > 6 > n/a - n/a

Photoexcited organic chromophores appended to stable radicals can serve as qubit and/or qudit candidates for quantum information applications. 1,6,7,12‐Tetra‐(4‐tert‐butylphenoxy)‐perylene‐3,4 : 9,10‐bis(dicarboximide) (tpPDI) linked to a partially deuterated α,γ‐bisdiphenylene‐β‐phenylallyl radical (BDPA‐d₁₆) was synthesized and characterized by time‐resolved optical and electron paramagnetic resonance...

article

Optical Spin Polarization of a Narrow‐Linewidth Electron‐Spin Qubit in a Chromophore/Stable‐Radical System

Yunfan Qiu, Asif Equbal, Chenjian Lin, Yuheng Huang, more

Angewandte Chemie > 135 > 6 > n/a - n/a

article

Aggregation‐Induced Emission and Circularly Polarized Luminescence Duality in Tetracationic Binaphthyl‐Based Cyclophanes

Amine Garci, Seifallah Abid, Arthur H. G. David, Marcos D. Codesal, more

Angewandte Chemie > 134 > 40 > n/a - n/a

Here, we report an approach to the synthesis of highly charged enantiopure cyclophanes by the insertion of axially chiral enantiomeric binaphthyl fluorophores into the constitutions of pyridinium‐based macrocycles. Remarkably, these fluorescent tetracationic cyclophanes exhibit a significant AIE compared to their neutral optically active binaphthyl precursors. A combination of theoretical calculations...

article

Aggregation‐Induced Emission and Circularly Polarized Luminescence Duality in Tetracationic Binaphthyl‐Based Cyclophanes

Amine Garci, Seifallah Abid, Arthur H. G. David, Marcos D. Codesal, more

Angewandte Chemie International Edition > 61 > 40 > n/a - n/a

article

Radically Enhanced Dual Recognition

Xiao‐Yang Chen, Haochuan Mao, Yuanning Feng, Kang Cai, more

Angewandte Chemie International Edition > 60 > 48 > 25454 - 25462

Complexation between a viologen radical cation (V^.+) and cyclobis(paraquat‐p‐phenylene) diradical dication (CBPQT^2(.+)) has been investigated and utilized extensively in the construction of mechanically interlocked molecules (MIMs) and artificial molecular machines (AMMs). The selective recognition of a pair of V^.+ using radical‐pairing interactions, however, remains a formidable challenge. Herein,...

article

Innenrücktitelbild: Radically Enhanced Dual Recognition (Angew. Chem. 48/2021)

Xiao‐Yang Chen, Haochuan Mao, Yuanning Feng, Kang Cai, more

Angewandte Chemie > 133 > 48 > 25787 - 25787

Die selektive Erkennung von zwei gestapelten Viologen‐Radikalkationen in Lösung unter Verwendung eines größenangepassten radikalischen Wirts wird von J. Fraser Stoddart et al. in der Zuschrift auf S. 25658 beschrieben. Durch die Verwendung von 2,6‐Bismethylennaphthalin als Linker ist der bisradikalische dikationische Wirt in der Lage, zwei Methylviologen‐Radikalkationen als Gäste mit starker und kooperativer...

article

Inside Back Cover: Radically Enhanced Dual Recognition (Angew. Chem. Int. Ed. 48/2021)

Xiao‐Yang Chen, Haochuan Mao, Yuanning Feng, Kang Cai, more

Angewandte Chemie International Edition > 60 > 48 > 25583 - 25583

Selective recognition of two stacked viologen radical cations in solution using a size‐matched radical host is reported by J. Fraser Stoddart and co‐workers in their Research Article on page 25454. By employing 2,6‐bismethylenenaphthalene as the linker, the bisradical dicationic host is able to accommodate two methyl viologen radical cation guests with strong and cooperative binding.

article

Radically Enhanced Dual Recognition

Xiao‐Yang Chen, Haochuan Mao, Yuanning Feng, Kang Cai, more

Angewandte Chemie > 133 > 48 > 25658 - 25666

article

Excitation Energy Transfer and Exchange‐Mediated Quartet State Formation in Porphyrin‐Trityl Systems

Oliver Nolden, Nico Fleck, Emmaline R. Lorenzo, Michael R. Wasielewski, more

Chemistry – A European Journal > 27 > 8 > 2683 - 2691

Photogenerated multi‐spin systems hold great promise for a range of technological applications in various fields, including molecular spintronics and artificial photosynthesis. However, the further development of these applications, via targeted design of materials with specific magnetic properties, currently still suffers from a lack of understanding of the factors influencing the underlying excited...

article

Cover Feature: Excitation Energy Transfer and Exchange‐Mediated Quartet State Formation in Porphyrin‐Trityl Systems (Chem. Eur. J. 8/2021)

Oliver Nolden, Nico Fleck, Emmaline R. Lorenzo, Michael R. Wasielewski, more

Chemistry – A European Journal > 27 > 8 > 2554 - 2554

The photo‐induced formation of a quartet state in a molecular conjugate consisting of a porphyrin and a trityl moiety is depicted in the cover image. Such photogenerated multi‐spin systems hold great promise for applications in quantum information technology, artificial photosynthesis, as well as spin catalysis. The quartet state formation was scrutinised by femtosecond UV/Vis absorption and electron...

article

Organic Nanocomposites: Supramolecular Porous Organic Nanocomposites for Heterogeneous Photocatalysis of a Sulfur Mustard Simulant (Adv. Mater. 32/2020)

Yassine Beldjoudi, Ahmet Atilgan, Jacob A. Weber, Indranil Roy, more

Advanced Materials > 32 > 32 > n/a - n/a

Manipulating the excited‐state evolution in host–guest complexes is of importance in developing new applications for organic molecular materials. In particular, the efficient production of triplet‐excited states in organic compounds upon light photoexcitation is of interest because of its wide range of applications. In article number 2001592, Joseph T. Hupp, J. Fraser Stoddart, and co‐workers report...

article

Supramolecular Porous Organic Nanocomposites for Heterogeneous Photocatalysis of a Sulfur Mustard Simulant

Yassine Beldjoudi, Ahmet Atilgan, Jacob A. Weber, Indranil Roy, more

Advanced Materials > 32 > 32 > n/a - n/a

Efficient heterogeneous photosensitizing materials require both large accessible surface areas and excitons of suitable energies and with well‐defined spin structures. Confinement of the tetracationic cyclophane (ExBox⁴⁺) within a nonporous anionic polystyrene sulfonate (PSS) matrix leads to a surface area increase of up to 225 m² g⁻¹ in ExBox•PSS. Efficient intersystem crossing is achieved by combining...

article

π‐Extended Donor–Acceptor Porphyrins and Metalloporphyrins for Antimicrobial Photodynamic Inactivation

Anzhela Galstyan, Yogesh Kumar Maurya, Halina Zhylitskaya, Youn Jue Bae, more

Chemistry – A European Journal > 26 > 37 > 8262 - 8266

Free base, zinc and palladium π‐extended porphyrins containing fused naphthalenediamide units were employed as photosensitizers in antimicrobial photodynamic therapy (aPDT). Their efficacy, assessed by photophysical and in vitro photobiological studies on Gram‐positive bacteria, was found to depend on metal coordination, showing a dramatic enhancement of photosensitizing activity for the palladium...

article

Perovskite Solar Cells: Simultaneous Bottom‐Up Interfacial and Bulk Defect Passivation in Highly Efficient Planar Perovskite Solar Cells using Nonconjugated Small‐Molecule Electrolytes (Adv. Mater. 40/2019)

Ding Zheng, Ruixiang Peng, Gang Wang, Jenna Leigh Logsdon, more

Advanced Materials > 31 > 40 > n/a - n/a

In article number 1903239, Junsheng Yu, Wei Huang, Ziyi Ge, Tobin J. Marks, Antonio Facchetti, and co‐workers present a spontaneous passivation method to greatly improve the performance of perovskite solar cells (PSCs) by using a zwitterionic small‐molecule electrolyte. This bottom‐up passivation is a novel and promising strategy to overcome outstanding issues impeding PSC advances in the future....

article

Simultaneous Bottom‐Up Interfacial and Bulk Defect Passivation in Highly Efficient Planar Perovskite Solar Cells using Nonconjugated Small‐Molecule Electrolytes

Ding Zheng, Ruixiang Peng, Gang Wang, Jenna Leigh Logsdon, more

Advanced Materials > 31 > 40 > n/a - n/a

Recent perovskite solar cell (PSC) advances have pursued strategies for reducing interfacial energetic mismatches to mitigate energy losses, as well as to minimize interfacial and bulk defects and ion vacancies to maximize charge transfer. Here nonconjugated multi‐zwitterionic small‐molecule electrolytes (NSEs) are introduced, which act not only as charge‐extracting layers for barrier‐free charge...

article

Combustion Synthesized Zinc Oxide Electron‐Transport Layers for Efficient and Stable Perovskite Solar Cells

Ding Zheng, Gang Wang, Wei Huang, Binghao Wang, more

Advanced Functional Materials > 29 > 16 > n/a - n/a

Perovskite solar cells (PSCs) have advanced rapidly with power conversion efficiencies (PCEs) now exceeding 22%. Due to the long diffusion lengths of charge carriers in the photoactive layer, a PSC device architecture comprising an electron‐ transporting layer (ETL) is essential to optimize charge flow and collection for maximum performance. Here, a novel approach is reported to low temperature, solution‐processed...

article

Tunable Crystallinity and Charge Transfer in Two‐Dimensional G‐Quadruplex Organic Frameworks

Yi‐Lin Wu, N. Scott Bobbitt, Jenna L. Logsdon, Natalia E. Powers‐Riggs, more

Angewandte Chemie > 130 > 15 > 4049 - 4053

DNA G‐quadruplex structures were recently discovered to provide reliable scaffolding for two‐dimensional organic frameworks due to the strong hydrogen‐bonding ability of guanine. Herein, 2,7‐diaryl pyrene building blocks with high HOMO energies and large optical gaps are incorporated into G‐quadruplex organic frameworks. The adjustable substitution on the aryl groups provides an opportunity to elucidate...

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INFONA - science communication portal

Search results for: Michael R. Wasielewski

Challenges in the Direct Detection of Chirality‐induced Spin Selectivity: Investigation of Foldamer‐based Donor‐acceptor Dyads

Evidence of a Uranium‐Paddlewheel Node in a Catecholate‐Based Metal–Organic Framework

Evidence of a Uranium‐Paddlewheel Node in a Catecholate‐Based Metal–Organic Framework

Optical Spin Polarization of a Narrow‐Linewidth Electron‐Spin Qubit in a Chromophore/Stable‐Radical System

Optical Spin Polarization of a Narrow‐Linewidth Electron‐Spin Qubit in a Chromophore/Stable‐Radical System

Aggregation‐Induced Emission and Circularly Polarized Luminescence Duality in Tetracationic Binaphthyl‐Based Cyclophanes

Aggregation‐Induced Emission and Circularly Polarized Luminescence Duality in Tetracationic Binaphthyl‐Based Cyclophanes

Radically Enhanced Dual Recognition

Innenrücktitelbild: Radically Enhanced Dual Recognition (Angew. Chem. 48/2021)

Inside Back Cover: Radically Enhanced Dual Recognition (Angew. Chem. Int. Ed. 48/2021)

Radically Enhanced Dual Recognition

Excitation Energy Transfer and Exchange‐Mediated Quartet State Formation in Porphyrin‐Trityl Systems

Cover Feature: Excitation Energy Transfer and Exchange‐Mediated Quartet State Formation in Porphyrin‐Trityl Systems (Chem. Eur. J. 8/2021)

Organic Nanocomposites: Supramolecular Porous Organic Nanocomposites for Heterogeneous Photocatalysis of a Sulfur Mustard Simulant (Adv. Mater. 32/2020)

Supramolecular Porous Organic Nanocomposites for Heterogeneous Photocatalysis of a Sulfur Mustard Simulant

π‐Extended Donor–Acceptor Porphyrins and Metalloporphyrins for Antimicrobial Photodynamic Inactivation

Perovskite Solar Cells: Simultaneous Bottom‐Up Interfacial and Bulk Defect Passivation in Highly Efficient Planar Perovskite Solar Cells using Nonconjugated Small‐Molecule Electrolytes (Adv. Mater. 40/2019)

Simultaneous Bottom‐Up Interfacial and Bulk Defect Passivation in Highly Efficient Planar Perovskite Solar Cells using Nonconjugated Small‐Molecule Electrolytes

Combustion Synthesized Zinc Oxide Electron‐Transport Layers for Efficient and Stable Perovskite Solar Cells

Tunable Crystallinity and Charge Transfer in Two‐Dimensional G‐Quadruplex Organic Frameworks

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