Compounds In Devices Research Articles

Game of Crowns: Na+ Is Coming! Red NIR-Emissive Hybrid Liquid Crystals Containing Discotic Crown Ethers and Na2Mo6X8iCl6 (Xi = Cl or Br).

Molecular or supramolecular materials that can self-organize into columns such as discotic liquid crystals are of interest for several applications in the field of optoelectronics. We show in this work that red near-infrared (NIR)-emissive metal cluster compounds of general formula Na2Mo6X8iCl6 (Xi = Cl or Br) can be readily complexed with discotic liquid crystals containing a crown ether. Three cavity sizes have been tested with crown ethers bearing 4, 5, or 6 oxygen atoms. In all cases, 1:1 complexes were formed, thanks to the well-known supramolecular interactions existing between the Na+ cations of the metal cluster salt and the crown ether derivatives. All obtained hybrids are homogeneous, emit in the red NIR region, and show liquid crystalline properties on a wider temperature range than their precursors. Charge transport properties have been investigated by using a space charge limited current device. Obtained results demonstrate that metal cluster compounds can enhance the charge carrier mobility by 5 orders of magnitude compared to the native discotic organic ligands. Considering that the presented organic crown ether derivatives are not the best candidates to design optoelectronic devices because of their inherently low conductivity, but that similar compounds were developed to design proton conductive porous framework, our results open promising perspectives for the use of metal cluster compounds in devices dedicated to such a field.

Coordination Compounds in Devices of Molecular Spintronics

Coordination Compounds in Devices of Molecular Spintronics

Coordination Compounds in Devices of Molecular Spintronics

Spintronics, being one of the youngest fields of microelectronics, is applied already for several decades to enhance the efficiency of components of computer equipment and to develop units of quantum computer and other electronic devices. The use of molecular material layers in a spintronic device makes it possible to substantially deepen the understanding of the spin transport mechanisms and to form foundation for a new trend at the nexus of physics and chemistry: molecular spintronics. Since the appearance of this trend, various coordination compounds, including semiconductors, single-molecule magnets, complexes with spin transitions, and metal-organic frameworks, are considered as molecular materials of spintronic devices with diverse unusual characteristics imparted by these materials. Specific features of using the earlier described representatives of the listed classes of compounds or their analogs, which are still “kept on the shelves” in chemical laboratories, for manufacturing polyfunctional devices of molecular spintronics are briefly reviewed.

Fluorinated (Nano)Carbons: CFx Electrodes and CFx‐Based Batteries

Fluorine‐based chemistry is widely used in commercial battery technology, from primary batteries consisting of Li/CFx to binders for electrodes in secondary lithium‐ion batteries. Fluorine‐based compounds are also formed during operation for both battery configurations as discharge products such as LiF or as components of the solid electrolyte interface (SEI) layers on electrodes. Herein, the fluorinated carbons or CFx detailing the commercialization of the first Li/CFx cells are discussed‐ the understanding of how performance is correlated to composition or x, the various methods to synthesize CFx compounds, the correlation between the nature of the CF bonds and electrochemical performance, the role of theoretical studies in such endeavors, the use of CFx in alternative battery chemistries and the wide range of techniques available to probe either CFx compounds individually or CFx compounds in devices under electrochemical conditions. A picture of the field from which future directions can be derived is provided.

Shining New Light on Multifunctional Lanthanide Single-Molecule Magnets.

Single-molecule magnets (SMMs) are at the forefront of new technological advances in quantum information processing and spintronics. Despite the recent impressive breakthroughs in extending the magnetic blocking temperatures beyond liquid-nitrogen temperatures, significant challenges await in terms of integrating and addressing such compounds in devices. With this ultimate goal in mind, the design of multifunctional SMMs not only allows to imbue molecules of interest with specific properties that would allow for in situ monitoring of the SMM operation in real time, but can also provide critical insights into our understanding of the magnetic behaviour. In this Review, we highlight how magnetism and luminescence can be harmoniously combined within single molecules to achieve these objectives. The key design principles to attain the simultaneous combination of photoluminescence and slow relaxation of the magnetization are discussed, along with an outlook on how such molecules could be beneficial for emerging next-generation spintronics devices.

An analytical model for the fate and transport of performance reference compounds and target compounds around cylindrical passive samplers

Passive sampling by deploying organic polymers for 20–30 days in soils or sediments has been used for the assessment of bioavailability and mobility of hydrophobic organic contaminants. An important step in their interpretation is the estimation of the degree of equilibration, typically through the release of performance reference compounds (PRCs). This paper develops an improved modeling tool for predicting the behaviors of PRCs and contaminant compounds in devices in cylindrical geometry, such as polydimethylsiloxane (PDMS) fibers or dialysis samplers of cylindrical cross-section. The model is solved by both a numerically inverted Laplace domain solution and an asymptotic analytical solution. The solutions are verified with the numerically simulated results. A comparison of the developed model to existing models for the calibration of uptake/release rates and the estimation of soil or sediment transport properties is performed. The result suggests that the cylindrical model provides a more accurate prediction for the transient behavior of PRC and target compounds as well as a better estimate of transport properties in the media.

Synthesis and photophysical properties of novel multisubstituted benzene and naphthalene derivatives with high 2D-π-conjugation

A new small molecule, with D-A-D framework was prepared in good yield by using a [2+1+2+1] cycloaddition followed by the [4+2] Diels–Alders reaction. Additionally, tetra-substituted naphthalene derivatives were also prepared from in situ generated benzyne (using 2-trimethylsilylphenyl triflate and cesium fluoride). All of this compounds exhibit strong 2D-π-conjugation. The influence of this type of interactions on photophysical properties with the aid of DFT calculations was examined. The preliminary tests of application possibility of synthesized compounds in devices for optoelectronics were carried out as well.

Performance of magnetostrictive rare earth iron compounds for devices

Magnetostrictive strains and magnetic induction have been measured as a function of applied DC field and pressure on the giant magnetostrictive material Tb/sub x/Dy/sub 1-x/Fe/sub y/ (x=0.3, 1.92 >