A divergent strategy for the synthesis of redox-active verdazyl radical polymers

2021 ◽  
Author(s):  
François Magnan ◽  
Jasveer S. Dhindsa ◽  
Michael Anghel ◽  
Paul Bazylewski ◽  
Giovanni Fanchini ◽  
...  
Keyword(s):  
Organic Electronics ◽  
Stable Radical ◽  
Proof Of Concept ◽  
Synthetic Strategy ◽  
Verdazyl Radical ◽  
Redox Active

We describe a divergent synthetic strategy based on ATRP and CuAAC chemistry for the production of stable radical polymers. As a proof of concept, we prepare verdazyl radical polymers with properties suitable for use in organic electronics.

Polynuclear metal complexes of nanometre size. A versatile synthetic strategy leading to luminescent and redox-active dendrimers made of an osmium(II)-based core and ruthenium(II)-based units in the branches

1997 ◽  
Vol 7 (7) ◽  
pp. 1227-1236 ◽  
Author(s):  
Scolastica Serroni ◽  
Alberto Juris ◽  
Margherita Venturi ◽  
Sebastiano Campagna ◽  
Immaculada Resino Resino ◽  
...  
Keyword(s):  
Metal Complexes ◽  
Synthetic Strategy ◽  
Redox Active ◽  
Polynuclear Metal Complexes

scholarly journals Device-quality, reconfigurable metamaterials from shape-directed nanocrystal assembly

2020 ◽  
Vol 117 (35) ◽  
pp. 21052-21057 ◽  
Author(s):  
Wenjie Zhou ◽  
Zizhuo Liu ◽  
Ziyin Huang ◽  
Haixin Lin ◽  
Devleena Samanta ◽  
...  
Keyword(s):  
Surface Area ◽  
Building Blocks ◽  
Large Surface Area ◽  
Proof Of Concept ◽  
Next Generation ◽  
Significant Challenge ◽  
Nanophotonic Devices ◽  
Synthetic Strategy ◽  
Anisotropic Nanoparticles ◽  
Nanocrystal Assembly

Anchoring nanoscale building blocks, regardless of their shape, into specific arrangements on surfaces presents a significant challenge for the fabrication of next-generation chip-based nanophotonic devices. Current methods to prepare nanocrystal arrays lack the precision, generalizability, and postsynthetic robustness required for the fabrication of device-quality, nanocrystal-based metamaterials [Q. Y. Lin et al. Nano Lett. 15, 4699–4703 (2015); V. Flauraud et al., Nat. Nanotechnol. 12, 73–80 (2017)]. To address this challenge, we have developed a synthetic strategy to precisely arrange any anisotropic colloidal nanoparticle onto a substrate using a shallow-template-assisted, DNA-mediated assembly approach. We show that anisotropic nanoparticles of virtually any shape can be anchored onto surfaces in any desired arrangement, with precise positional and orientational control. Importantly, the technique allows nanoparticles to be patterned over a large surface area, with interparticle distances as small as 4 nm, providing the opportunity to exploit light–matter interactions in an unprecedented manner. As a proof-of-concept, we have synthesized a nanocrystal-based, dynamically tunable metasurface (an anomalous reflector), demonstrating the potential of this nanoparticle-based metamaterial synthesis platform.

Exploiting stable radical states for multifunctional properties in triarylamine-based porous organic polymers

2014 ◽  
Vol 2 (31) ◽  
pp. 12466-12474 ◽  
Author(s):  
Carol Hua ◽  
Aditya Rawal ◽  
Thomas B. Faust ◽  
Peter D. Southon ◽  
Ravichandar Babarao ◽  
...  
Keyword(s):  
Solar Energy ◽  
Energy Conversion ◽  
Solar Energy Conversion ◽  
Stable Radical ◽  
Organic Polymers ◽  
Porous Organic Polymers ◽  
Redox Active ◽  
Multifunctional Properties

Redox-active porous organic polymers (POPs) have enormous potential in applications ranging from electrocatalysis to solar energy conversion.

scholarly journals Redox-active tetrathiafulvalene and dithiolene compounds derived from allylic 1,4-diol rearrangement products of disubstituted 1,3-dithiole derivatives

2010 ◽  
Vol 6 ◽  
pp. 1002-1014 ◽  
Author(s):  
Filipe Vilela ◽  
Peter J Skabara ◽  
Christopher R Mason ◽  
Thomas D J Westgate ◽  
Asun Luquin ◽  
...  
Keyword(s):  
Perchloric Acid ◽  
Alternative Route ◽  
Active Compounds ◽  
Synthetic Strategy ◽  
Redox Active

We present a series of compounds by exploiting the unusual 1,4-aryl shift observed for electron-rich 1,3-dithiole-2-thione and tetrathiafulvalene (TTF) derivatives in the presence of perchloric acid. The mechanistic features of this rearrangement are discussed since this synthetic strategy provides an alternative route for the synthesis and functionalisation of sulfur rich compounds including redox active compounds of TTFs, and a Ni dithiolene.

scholarly journals Bis(triphenylphosphine)iminium Salts of Dioxothiadiazole Radical Anions: Preparation, Crystal Structures, and Magnetic Properties

Crystals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 30 ◽  
Author(s):  
Paweł Pakulski ◽  
Mirosław Arczyński ◽  
Dawid Pinkowicz
Keyword(s):  
Magnetic Properties ◽  
Crystal Structures ◽  
Magnetic Materials ◽  
Exchange Coupling ◽  
Crystal Packing ◽  
Stable Radical ◽  
Radical Anions ◽  
Iminium Salts ◽  
Redox Active ◽  
Derivatives Of

Phenanthroline dioxothiadiazoles are redox active molecules that form stable radical anions suitable for the construction of supramolecular magnetic materials. Herein, the preparation, structures and magnetic properties of bis(triphenylphosphine)iminium (PPN) salts of [1,2,5]thiadiazole[3,4-f][1,10]phenanthroline 1,1-dioxide (L), [1,2,5]thiadiazole[3,4-f][4,7]phenanthroline 1,1-dioxide (4,7-L), 5-bromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (BrL), and 5,10-dibromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (diBrL) are reported. The preparation of new bromo derivatives of the L: 5-bromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (BrL) and 5,10-dibromo-[1,2,5]thiadiazolo[3,4-f][1,10]phenanthroline 2,2-dioxide (diBrL)—suitable starting materials for further derivatization—are described starting from a commercially available and cheap 1,10-phenanthroline. All PPN salts show antiferromagnetic interactions between the pairs of radical anions, which in the case of PPN(diBrL) are very strong (−116 cm−1; using Ĥ = −2JSS type of exchange coupling Hamiltonian) due to a different crystal packing of the anion radicals as compared to PPN(L), PPN(4,7-L), and PPN(BrL).

Electrosynthesis and characterization of stable radical-functionalized oligo/polythiophenes

2015 ◽  
Vol 39 (10) ◽  
pp. 7738-7741 ◽  
Author(s):  
Somaiah Almubayedh ◽  
M'hamed Chahma
Keyword(s):  
Electrochemical Oxidation ◽  
Stable Radical ◽  
Verdazyl Radical

A stable poly(terthiophene)-bearing-verdazyl radical has been prepared using the electrochemical oxidation of either the parent radical or its precursor.

Direct measurement of electron-diffraction-pattern intensities using an energy loss spectrometer

1989 ◽  
Vol 47 ◽  
pp. 668-669
Author(s):  
A. G. Jackson ◽  
M. Rowe
Keyword(s):  
Thermal Effects ◽  
Dynamic Range ◽  
Scattering Amplitude ◽  
Dynamical Theory ◽  
Site Symmetry ◽  
Proof Of Concept ◽  
Parallel Acquisition ◽  
Kinematic Approximation ◽  
Speed Up ◽  
Structure Calculations

Diffraction intensities from intermetallic compounds are, in the kinematic approximation, proportional to the scattering amplitude from the element doing the scattering. More detailed calculations have shown that site symmetry and occupation by various atom species also affects the intensity in a diffracted beam. [1] Hence, by measuring the intensities of beams, or their ratios, the occupancy can be estimated. Measurement of the intensity values also allows structure calculations to be made to determine the spatial distribution of the potentials doing the scattering. Thermal effects are also present as a background contribution. Inelastic effects such as loss or absorption/excitation complicate the intensity behavior, and dynamical theory is required to estimate the intensity value.The dynamic range of currents in diffracted beams can be 104or 105:1. Hence, detection of such information requires a means for collecting the intensity over a signal-to-noise range beyond that obtainable with a single film plate, which has a S/N of about 103:1. Although such a collection system is not available currently, a simple system consisting of instrumentation on an existing STEM can be used as a proof of concept which has a S/N of about 255:1, limited by the 8 bit pixel attributes used in the electronics. Use of 24 bit pixel attributes would easily allowthe desired noise range to be attained in the processing instrumentation. The S/N of the scintillator used by the photoelectron sensor is about 106 to 1, well beyond the S/N goal. The trade-off that must be made is the time for acquiring the signal, since the pattern can be obtained in seconds using film plates, compared to 10 to 20 minutes for a pattern to be acquired using the digital scan. Parallel acquisition would, of course, speed up this process immensely.

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