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article

Optical properties and photoinduced superparamagnetism of γ-Fe2O3 nanoparticles formed in dendrimer

V.E. Vorobeva, N.E. Domracheva, M.S. Gruzdev, A.V. Pyataev, more

Materials Science in Semiconductor Processing > 2015 > 38 > Complete > 336-341

We are presenting the joint investigation of the optical and photoinduced superparamagnetic properties of a single-domain γ-Fe ₂ O ₃ nanoparticles (NPs) formed in poly(propylene imine) (PPI)-dendrimer. The optical absorption studies indicated direct allowed transition with the band gap (4.5eV), which is ''blue''-shift with respect to the value of the bulk material. The influence of...

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Thermodynamic, spectroscopic and DFT description of oxidovanadium(IV) complexes with malate and tartrate in aqueous solution

Silvia Berto, Pier Giuseppe Daniele, Eliano Diana, Enzo Laurenti, more

Inorganica Chimica Acta > 2014 > 414 > Complete > 105-114

This investigation deals with coordination compounds of oxidovanadium(IV) with l-malic and l-tartaric acids in aqueous solution. The different binary systems are studied by potentiometric, spectroscopic techniques and DFT calculation in a wide concentration range and with different metal/ligand ratios. Electronic paramagnetic resonance spectroscopy (EPR) and molecular absorption spectrophotometry...

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Synthesis, characterization and cell viability test of six vanadyl complexes with acetylacetonate derivatives

Speranza Sgarbossa, Eliano Diana, Domenica Marabello, Annamaria Deagostino, more

Journal of Inorganic Biochemistry > 2013 > 128 > Complete > 26-37

Vanadium compounds are known to display a number of therapeutic effects, namely insulin-mimetic and cardiovascular effects. Evidence of the antiproliferative and proapoptotic activity of a number of vanadyl complexes, together with their low toxicity, establishes these metal compounds as promising antitumoral therapeutic agents. In the present work, we describe the synthesis and full characterization...

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Triggered Functional Dynamics of AsLOV2 by Time‐Resolved Electron Paramagnetic Resonance at High Magnetic Fields

Shiny Maity, Brad D. Price, C. Blake Wilson, Arnab Mukherjee, more

Angewandte Chemie International Edition > 62 > 13 > n/a - n/a

We present time‐resolved Gd−Gd electron paramagnetic resonance (TiGGER) at 240 GHz for tracking inter‐residue distances during a protein's mechanical cycle in the solution state. TiGGER makes use of Gd‐sTPATCN spin labels, whose favorable qualities include a spin‐7/2 EPR‐active center, short linker, narrow intrinsic linewidth, and virtually no anisotropy at high fields (8.6 T) when compared to nitroxide...

article

Triggered Functional Dynamics of AsLOV2 by Time‐Resolved Electron Paramagnetic Resonance at High Magnetic Fields

Shiny Maity, Brad D. Price, C. Blake Wilson, Arnab Mukherjee, more

Angewandte Chemie > 135 > 13 > n/a - n/a

We present time‐resolved Gd−Gd electron paramagnetic resonance (TiGGER) at 240 GHz for tracking inter‐residue distances during a protein's mechanical cycle in the solution state. TiGGER makes use of Gd‐sTPATCN spin labels, whose favorable qualities include a spin‐7/2 EPR‐active center, short linker, narrow intrinsic linewidth, and virtually no anisotropy at high fields (8.6 T) when compared to nitroxide...

article

Evidence of Al^II Radical Addition to Benzene

Debdeep Mandal, T. Ilgin Demirer, Tetiana Sergeieva, Bernd Morgenstern, more

Angewandte Chemie > 135 > 13 > n/a - n/a

Electrophilic Al^III species have long dominated the aluminum reactivity towards arenes. Recently, nucleophilic low‐valent Al^I aluminyl anions have showcased oxidative additions towards arenes C−C and/or C−H bonds. Herein, we communicate compelling evidence of an Al^II radical addition reaction to the benzene ring. The electron reduction of a ligand stabilized precursor with KC₈ in benzene furnishes...

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Evidence of Al^II Radical Addition to Benzene

Debdeep Mandal, T. Ilgin Demirer, Tetiana Sergeieva, Bernd Morgenstern, more

Angewandte Chemie International Edition > 62 > 13 > n/a - n/a

Electrophilic Al^III species have long dominated the aluminum reactivity towards arenes. Recently, nucleophilic low‐valent Al^I aluminyl anions have showcased oxidative additions towards arenes C−C and/or C−H bonds. Herein, we communicate compelling evidence of an Al^II radical addition reaction to the benzene ring. The electron reduction of a ligand stabilized precursor with KC₈ in benzene furnishes...

article

Magnetic Anisotropy and Relaxation of Pseudotetrahedral [N₂O₂] Bis‐Chelate Cobalt(II) Single‐Ion Magnets Controlled by Dihedral Twist Through Solvomorphism

Maximilian H. Pohle, Michael Böhme, Thomas Lohmiller, Sven Ziegenbalg, more

Chemistry – A European Journal > 29 > 14 > n/a - n/a

The methanol solvomorph 1 ⋅ 2MeOH of the cobalt(II) complex [Co(L^Sal,2−Ph)₂] (1) with the sterically demanding Schiff‐base ligand 2‐(([1,1′‐biphenyl]‐2‐ylimino)methyl)phenol (HL^Sal,2−Ph) shows the thus far largest dihedral twist distortion between the two chelate planes compared to an ideal pseudotetrahedral arrangement. The cobalt(II) ion in 1 ⋅ 2MeOH exhibits an easy‐axis anisotropy leading to a...

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Zero‐Field Splittings and Redox Potentials in an Isostructural Series of Dinuclear Fe^IITi^IV, Fe^IIITi^IV, and Mn^IITi^IV Complexes with a Face‐Sharing Bridging Motive

Ioannis Liratzis, Stephan Walleck, Jan Oldengott, Anja Stammler, more

European Journal of Inorganic Chemistry > 26 > 5 > n/a - n/a

The ligand H₆ioan has been used to synthesize the three dinuclear complexes [(ioan)Mn^IITi^IV], [(ioan)Fe^IITi^IV], and [(ioan)Fe^IIITi^IV]⁺. The face‐sharing bridging mode of the three phenolates provides short M‐Ti^IV distances of ≈3.0 Å. Mössbauer spectra of [(ioan)Fe^IIITi^IV]⁺ show a magnetically split six‐line spectrum at 3 K in zero magnetic field demonstrating a slow magnetic relaxation. Magnetic measurements...

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

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

Tuning the Internal Compartmentation of Single‐Chain Nanoparticles as Fluorescent Contrast Agents

Justus F. Thümmler, Andreas H. Roos, Jana Krüger, Dariush Hinderberger, more

Macromolecular Rapid Communications > 44 > 2 > n/a - n/a

Controlling the internal structures of single‐chain nanoparticles (SCNPs) is an important factor for their targeted chemical design and synthesis, especially in view of nanosized compartments presenting different local environments as a main feature to control functionality. We here design SCNPs bearing near‐infrared fluorescent dyes embedded in hydrophobic compartments for use as contrast agents...

article

¹⁷O Hyperfine Spectroscopy Reveals Hydration Structure of Nitroxide Radicals in Aqueous Solutions

Fabian Hecker, Lisa Fries, Markus Hiller, Mario Chiesa, more

Angewandte Chemie International Edition > 62 > 4 > n/a - n/a

The hydration structure of nitroxide radicals in aqueous solutions is elucidated by advanced ¹⁷O hyperfine (hf) spectroscopy with support of quantum chemical calculations and MD simulations. A piperidine and a pyrrolidine‐based nitroxide radical are compared and show clear differences in the preferred directionality of H‐bond formation. We demonstrate that these scenarios are best represented in ¹⁷...

article

¹⁷O Hyperfine Spectroscopy Reveals Hydration Structure of Nitroxide Radicals in Aqueous Solutions

Fabian Hecker, Lisa Fries, Markus Hiller, Mario Chiesa, more

Angewandte Chemie > 135 > 4 > n/a - n/a

The hydration structure of nitroxide radicals in aqueous solutions is elucidated by advanced ¹⁷O hyperfine (hf) spectroscopy with support of quantum chemical calculations and MD simulations. A piperidine and a pyrrolidine‐based nitroxide radical are compared and show clear differences in the preferred directionality of H‐bond formation. We demonstrate that these scenarios are best represented in ¹⁷...

article

Tetrazine Chelate Ligands Bridging Two [Ru(acac)₂] Fragments: Mixed Valency and Radical Complex Formation

Wolfgang Kaim, Isabell Löw, Mark R. Ringenberg, Brigitte Schwederski, more

Zeitschrift für anorganische und allgemeine Chemie > 648 > 23 > n/a - n/a

Using bis(3‐methyl‐2‐pyridyl)‐1,2,4,5‐tetrazine 1, 3‐(2‐pyrimidyl)‐6‐methyl‐1,2,4,5‐tetrazine 2 and bis(2‐pyrimidyl)‐1,2,4,5‐tetrazine=bmtz as ligands, the complexes 3=[Ru(acac)₂(1)], 4={[Ru(acac)₂]₂(1)], 5={[Ru(acac)₂]₂(bmtz)], and 6={[Ru(acac)₂]₂(2)] were prepared and identified by structure analysis of crystallized material. The one‐electron oxidized form 6(PF₆) was also studied structurally, suggesting...

article

Cover Feature: Probing the Structural Dynamics of a Bacterial Chaperone in Its Native Environment by Nitroxide‐Based EPR Spectroscopy (Chem. Eur. J. 66/2022)

Annalisa Pierro, Alessio Bonucci, Davide Normanno, Mireille Ansaldi, more

Chemistry – A European Journal > 28 > 66 > n/a - n/a

Messages from the cell: The cover picture honors the sensitivity of nitroxide labels combined with EPR spectroscopy in reporting on protein structure dynamics inside bacterial cells. We have demonstrated, in particular, that NarJ protein can be investigated at room temperature within 15 minutes, conditions that allow the preservation of both cell integrity and the activity of the protein under investigation...

article

Probing the Structural Dynamics of a Bacterial Chaperone in Its Native Environment by Nitroxide‐Based EPR Spectroscopy

Annalisa Pierro, Alessio Bonucci, Davide Normanno, Mireille Ansaldi, more

Chemistry – A European Journal > 28 > 66 > n/a - n/a

One of the greatest current challenges in structural biology is to study protein dynamics over a wide range of timescales in complex environments, such as the cell. Among magnetic resonances suitable for this approach, electron paramagnetic resonance spectroscopy coupled to site‐directed spin labeling (SDSL‐EPR) has emerged as a promising tool to study protein local dynamics and conformational ensembles...

article

Cationic Nickel d⁹‐Metalloradicals [Ni(NHC)₂]⁺

Lukas Tendera, Martin S. Luff, Ivo Krummenacher, Udo Radius

European Journal of Inorganic Chemistry > 2022 > 31 > n/a - n/a

A series of five new homoleptic, linear nickel d⁹‐complexes of the type [Ni^I(NHC)₂]⁺ is reported. Starting from the literature known Ni(0) complexes [Ni(Mes₂Im)₂] 1, [Ni(Mes₂Im^H2)₂] 2, [Ni(Dipp₂Im)₂] 3, [Ni(Dipp₂Im^H2)₂] 4 and [Ni(cAAC^Me)₂] 5 (Mes₂Im=1,3‐bis(2,4,6‐trimethylphenyl)‐imidazolin‐2‐ylidene, Mes₂Im^H2=1,3‐bis(2,4,6‐trimethylphenyl)‐imidazolidin‐2‐ylidene, Dipp₂Im=1,3‐bis(2,6‐diisopropylphenyl)‐imidazolin‐2‐ylidene,...

article

Morphology and Light‐Dependent Spatial Distribution of Spin Defects in Carbon Nitride

Arianna Actis, Michele Melchionna, Giacomo Filippini, Paolo Fornasiero, more

Angewandte Chemie > 134 > 43 > n/a - n/a

Carbon nitride (CN) is a heterogeneous photocatalyst that combines good structural properties and a broad scope. The photocatalytic efficiency of CN is associated with the presence of defective and radical species. An accurate description of defective states—both at a local and extended level—is key to develop a thorough mechanistic understanding of the photophysics of CN. In turn, this will maximise...

article

Morphology and Light‐Dependent Spatial Distribution of Spin Defects in Carbon Nitride

Arianna Actis, Michele Melchionna, Giacomo Filippini, Paolo Fornasiero, more

Angewandte Chemie International Edition > 61 > 43 > n/a - n/a

Carbon nitride (CN) is a heterogeneous photocatalyst that combines good structural properties and a broad scope. The photocatalytic efficiency of CN is associated with the presence of defective and radical species. An accurate description of defective states—both at a local and extended level—is key to develop a thorough mechanistic understanding of the photophysics of CN. In turn, this will maximise...

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Search results

Optical properties and photoinduced superparamagnetism of γ-Fe2O3 nanoparticles formed in dendrimer

Thermodynamic, spectroscopic and DFT description of oxidovanadium(IV) complexes with malate and tartrate in aqueous solution

Synthesis, characterization and cell viability test of six vanadyl complexes with acetylacetonate derivatives

Triggered Functional Dynamics of AsLOV2 by Time‐Resolved Electron Paramagnetic Resonance at High Magnetic Fields

Triggered Functional Dynamics of AsLOV2 by Time‐Resolved Electron Paramagnetic Resonance at High Magnetic Fields

Evidence of Al^II Radical Addition to Benzene

Evidence of Al^II Radical Addition to Benzene

Magnetic Anisotropy and Relaxation of Pseudotetrahedral [N₂O₂] Bis‐Chelate Cobalt(II) Single‐Ion Magnets Controlled by Dihedral Twist Through Solvomorphism

Zero‐Field Splittings and Redox Potentials in an Isostructural Series of Dinuclear Fe^IITi^IV, Fe^IIITi^IV, and Mn^IITi^IV Complexes with a Face‐Sharing Bridging Motive

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

Tuning the Internal Compartmentation of Single‐Chain Nanoparticles as Fluorescent Contrast Agents

¹⁷O Hyperfine Spectroscopy Reveals Hydration Structure of Nitroxide Radicals in Aqueous Solutions

¹⁷O Hyperfine Spectroscopy Reveals Hydration Structure of Nitroxide Radicals in Aqueous Solutions

Tetrazine Chelate Ligands Bridging Two [Ru(acac)₂] Fragments: Mixed Valency and Radical Complex Formation

Cover Feature: Probing the Structural Dynamics of a Bacterial Chaperone in Its Native Environment by Nitroxide‐Based EPR Spectroscopy (Chem. Eur. J. 66/2022)

Probing the Structural Dynamics of a Bacterial Chaperone in Its Native Environment by Nitroxide‐Based EPR Spectroscopy

Cationic Nickel d⁹‐Metalloradicals [Ni(NHC)₂]⁺

Morphology and Light‐Dependent Spatial Distribution of Spin Defects in Carbon Nitride

Morphology and Light‐Dependent Spatial Distribution of Spin Defects in Carbon Nitride

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