ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Reassessment of the First Metal-Carbonyl Dissociation Energy in M(CO)4 (M = Ni, Pd, Pt), M(CO)5 Fe, Ru, Os), and M(CO)6 Cr, Mo, W) by a Quasirelativistic Density Functional MethodJian Li, Georg Schreckenbach, Tom ZieglerCite this: J. Am. Chem. Soc. 1995, 117, 1, 486–494Publication Date (Print):January 1995Publication History Published online1 May 2002Published inissue 1 January...

We report five ultra-low viscosity nematic liquid crystal mixtures with birefringence around 0.1, dielectric anisotropy in the range of 3 to 6, and clearing temperature about 80°C. A big advantage these low is activation energy, which significantly suppresses rising rate at temperatures. Using our mixture M3 as an example, response time a 3-μm cell −20°C only 30 ms. Widespread application materials for display devices demanding fast time, especially temperatures, foreseeable.

The enhancements of the dielectric and optical anisotropies have been realized by an introduction 1,3-dioxolane as end group in corresponding molecules.

Compared to analog beamforming, digital beamforming offers better self-calibration and lower sidelobe performance, which has a profound impact on improving low Earth orbit receiver performance. The Digital Beamforming (DBF) module in the satellite broadcast signal reception terminal can use phase shifting compensate for differences caused by path spatial distance variations due inconsistent Radio Frequency (RF) channel delays. This compensation ensures in-phase summation, thereby achieving...

Abstract A series of benzothiadiazole (BT)‐based dichroic dyes with donor–acceptor–donor (D–A–D) molecular frameworks is designed and synthesized, exhibiting absorption spectra that cover the visible light region are tunable through modifications. Most newly synthesized show high ratios order parameters, ensuring strong optical anisotropy good alignment within liquid crystal host mixture. The performance individual in smart window applications evaluated, transmittance changes observed under...

We report three liquid crystal (LC) mixtures with a wide nematic range (−40°C to ~100°C), small visco-elastic coefficient and low activation energy for vehicular displays. Physical properties at different temperatures were characterized. These LCs greatly improve the performance of display devices in car: 1) head-up projection using liquid-crystal-on-silicon an average gray-to-gray (GTG) response time less than 1 ms elevated temperature. 2) The GTG is maintained ~10 fringing field switching...

Interactions of Cu with CoSi2, CrSi2, and TiSi2 without interposed TiNx layers have been studied using Rutherford backscattering spectrometry, Auger electron x-ray diffraction, in situ sheet resistivity measurements. diffuses through a preformed CoSi2 layer to form the structure CoSi2/Cu3Si/Si(100). No dissociation has observed. For Cu/CrSi2/Si system, outdiffusion Si leads formation Cu3Si/CrSi2/Si at temperatures above 300 °C. At about same temperature, into TiSi2/Si interface react both Ti...

Six benzoxazole-terminated mesogenic compounds with fluoro substituent at different positions were prepared and their properties investigated. The give a high birefringence (Δn~ 0.45) large-dielectric anisotropy (Δε~ 26), indicating possible application in liquid-crystal mixture as dopant to enhance performance of the host mixture. In accordance conventional Δn liquid crystals containing triple carbon-carbon bonds, lateral substituents terminal groups can alter Δε crystals. Meanwhile, some...

Abstract Deutsch's algorithm is the first quantum to demonstrate an advantage over classical algorithms. Here, problem generalized functions and a with indefinite causal order proposed solve this problem. The not only reduces number of queries black box by half compared algorithm, but also significantly decreases complexity circuit required gates algorithm. experimentally demonstrated in stable Sagnac loop interferometer common path, which overcomes obstacles both phase instability low...

This paper describes the synthesis and characterisation of several liquid crystal (LC) compounds having a tolane core structure trifluoromethoxy terminal group. The mesomorphic properties, mid-wave infrared (IR) absorption birefringence were investigated. These materials exhibit low in IR regions (MWIR) high (Δn ~ 0.26–0.29). impact fluorine substitution was Compounds with monofluorine wide mesophase temperature (88.5°C), behaviour weakened increasing atom. results show that they are...

Multifluorinated phenyl-tolane liquid crystals were synthesised by two steps cross-coupling reactions, and their structures confirmed nuclear magnetic resonance (NMR), mass spectra (MS) infrared spectrometry (IR). All of these compounds show only nematic phase, melting points decrease dramatically with the introduction lateral fluorine atom. The physical properties also evaluated. extrapolated birefringence are at range 0.32–0.37 589 nm, dielectric anisotropies exist between 3.1 20.6,...

Ionic ZnFe2O4 is a weak magnetic ferrofluid with different particle sizes (a polydisperse ferrofluid), in which the dipolar coupling constant λ less than 2. By comparing reduced magnetization curves and initial susceptibilities of ferrofluids volume fractions ϕ, it found that there are field-induced attractive interactions between colloidal particles, make them aggregate; this interaction decreases ϕ. The so small aggregation cannot be induced by alone. Thus, can concluded from experimental...

A nonlocal, quasi-relativistic density functional method has been applied in a study of dihydrogen and dihydride isomers M(CO)3(PH3)2H2 (M = Cr, Mo, W) Mo(CO)n(PH3)5-nH2 (n 1, 3, 5). The optimized structures calculated energetics are good agreement with available experimental data. H2 dissociation energies the complexes M(CO)3(PH3)2(H2) exhibit typical V-like trend along triad, as other transition metal carbonyls π-complexes. An extended state energy decomposition scheme revealed that both...

Three series of new tolanyl benzene isothiocyanate liquid crystals A, B and C were synthesised with lateral fluorine substituent at different positions 3,5-difluoro terminal groups. Series D compound E4 carbon–carbon triple bond connected the isothiocyanated also prepared as reference. Their structures confirmed using infrared spectrometry, nuclear magnetic resonance mass spectrometry. The mesomorphic properties, birefringence, dielectric anisotropy miscibility these compounds investigated....

Xiaozhe Yangab, Lingchao Moab, Minggang Huab, Jian Liab, Juanli Ran Chenc & Zhongwei An*abca State Key Laboratory of Fluorine Nitrogen Chemicals, Xi'an, P. R. Chinab Optical and Electrical Material Center, Xi'an Modern Chemistry Research Institute, Chinac School Materials Science Engineering, Shaanxi Normal University, China

We optimise a new liquid crystal mixture with wide nematic range, high birefringence (Δn), resistivity, moderate dielectric anisotropy (∆ε) and relatively low rotational viscosity for augmented reality display applications. High Δn large Δε allow thin cell gap (d ≈ 1.5 μm) to be employed in reflective liquid-crystal-on-silicon (LCoS) device achieve 2π phase change at 5 V 2.87 ms average phase-to-phase response time 40°C without complicated overdrive circuitry. Such fast enables an LCoS panel...

The dependence of magnetic transition on the treatment solution used in preparation nanoparticles was investigated using as-prepared products from paramagnetic FeOOH/Mg(OH) 2 via a chemically induced transition. Treatment FeCl 3 and CuCl solutions led to product that showed no transition, whereas after with FeSO 4 or ferromagnetism. Experiments revealed magnetism caused by ferrimagnetic γ -Fe O phase nanoparticles, which had coating ferric compound. This observation suggests Fe 2+ underwent...