Interaction of Thioether Groups at the Open Coordination Sites of Palladium(II) and Platinum(II) Complexes Probed by Luminescence Spectroscopy at Variable Pressure

2010 ◽  
Vol 49 (11) ◽  
pp. 4901-4908 ◽  
Author(s):  
Esther Pierce ◽  
Etienne Lanthier ◽  
Caroline Genre ◽  
Yurii Chumakov ◽  
Dominique Luneau ◽  
...  
Keyword(s):  
Variable Pressure ◽  
Luminescence Spectroscopy ◽  
Coordination Sites

scholarly journals [Pt(SCN)4 ]2- -Based Coordination Polymers and Supramolecular Squares: Intermolecular Pt···H-C Interactions Probed by Luminescence Spectroscopy at Variable Pressure

2017 ◽  
Vol 2017 (22) ◽  
pp. 2864-2864 ◽  
Author(s):  
Yan Suffren ◽  
Masayuki Kobayashi ◽  
Jeffrey S. Ovens ◽  
Alexandre Rodrigue-Witchel ◽  
Caroline Genre ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Variable Pressure ◽  
Luminescence Spectroscopy

Temperature- and pressure-dependent luminescence spectroscopy on the trans-[ReO2(pyridine)4]+ complex — Analysis of vibronic structure, luminescence energies, and bonding characteristics

2004 ◽  
Vol 82 (6) ◽  
pp. 1083-1091 ◽  
Author(s):  
John K Grey ◽  
Ian S Butler ◽  
Christian Reber
Keyword(s):  
Molecular Structure ◽  
Low Temperature ◽  
Room Temperature ◽  
Complex Analysis ◽  
Variable Pressure ◽  
Luminescence Spectroscopy ◽  
Luminescence Spectra ◽  
Vibronic Structure ◽  
Temperature Spectra ◽  
Temperature And Pressure

Resolved vibronic structure in electronic spectra provides a detailed view into how molecular structure changes after absorption or emission of a photon. We report temperature- and pressure-dependent luminescence spectra of trans-[ReO2(pyridine)4]I. Low-temperature spectra reveal long vibronic progressions in the totally symmetric O=Re=O (907 cm–1) and Re-pyridine (211 cm–1) stretching modes, indicating large structural displacements along these normal coordinates. The luminescence band maximum is at ca. 15 500 cm–1. Room-temperature spectra are somewhat less-resolved; however, intervals closely matching the O=Re=O frequency (~870 cm–1) persist at higher temperatures. The variable pressure spectra exhibit distinct changes in the vibronic patterns, and luminescence energies decrease by 16 ± 2 cm–1/kbar (1 bar = 100 kPa). Low-temperature spectra are modeled using two-dimensional potential energy surfaces to represent the initial and final electronic states, from which the quantitative normal coordinate offsets can be determined. We then adapt this model to the room-temperature, pressure-dependent data where it is possible to determine how the offsets and other important spectroscopic parameters vary with the pressure-induced changes of the molecular structure. Key words: trans-[ReO2(pyridine)4]I, low-temperature luminescence spectroscopy, high-pressure luminescence spectroscopy, vibronic structure, emitting state distortions.

Characterization of Pd⋯H–C interactions in bis-dimethyldithiocarbamate palladium(ii) and its deuterated analog by luminescence spectroscopy at variable pressure

2016 ◽  
Vol 45 (27) ◽  
pp. 10883-10886 ◽  
Author(s):  
Stéphanie Poirier ◽  
Elodie Tailleur ◽  
Hudson Lynn ◽  
Christian Reber
Keyword(s):  
Luminescence Band ◽  
Variable Pressure ◽  
Luminescence Spectroscopy ◽  
Deuterated Analog

Luminescence band maxima of bis-dimethyldithiocarbamate palladium(ii) and its deuterated analog show distinct shifts in three pressure ranges, indicative of three different interactions.

[Pt(SCN)4]2--Based Coordination Polymers and Supramolecular Squares: Intermolecular Pt···H-C Interactions Probed by Luminescence Spectroscopy at Variable Pressure

2017 ◽  
Vol 2017 (22) ◽  
pp. 2865-2875 ◽  
Author(s):  
Yan Suffren ◽  
Masayuki Kobayashi ◽  
Jeffrey S. Ovens ◽  
Alexandre Rodrigue-Witchel ◽  
Caroline Genre ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Variable Pressure ◽  
Luminescence Spectroscopy

Scanning electron microscopy of plant cells using a variable-pressure SEM and cryogenic techniques

1993 ◽  
Vol 51 ◽  
pp. 260-261
Author(s):  
M. Yamada ◽  
K. Ueda ◽  
K. Kuboki ◽  
H. Matsushima ◽  
S. Joens
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Saturated Vapor ◽  
Plant Cells ◽  
Variable Pressure ◽  
Specimen Preparation ◽  
Operating Pressure ◽  
Vapor Pressures ◽  
Low Temperature Microscopy ◽  
Scanning Electron

Use of variable Pressure SEMs is spreading among electron microscopists The variable Pressure SEM does not necessarily require specimen Preparation such as fixation, dehydration, coating, etc which have been required for conventional scanning electron microscopy. The variable Pressure SEM allows operating Pressure of 1˜270 Pa in specimen chamber It does not allow microscopy of water-containing specimens under a saturated vapor Pressure of water. Therefore, it may cause shrink or deformation of water-containing soft specimens such as plant cells due to evaporation of water. A solution to this Problem is to lower the specimen temperature and maintain saturated vapor Pressures of water at low as shown in Fig. 1 On this technique, there is a Published report of experiment to have sufficient signal to noise ratio for scondary electron imaging at a relatively long working distance using an environmental SEM. We report here a new low temperature microscopy of soft Plant cells using a variable Pressure SEM (Hitachi S-225ON).

PROJECT ON ELECTRONIC STEERING SYSYTEM

2018 ◽  
Vol 4 (5) ◽  
pp. 7
Author(s):  
Shivam Dwivedi ◽  
Prof. Vikas Gupta
Keyword(s):  
Steering System ◽  
Essential Elements ◽  
Variable Pressure ◽  
Passenger Cars ◽  
Control Techniques ◽  
Steering Mechanism ◽  
Dynamics And Control ◽  
Active Research ◽  
Electronic Steering ◽  
And Control

As the four-wheel steering (4WS) system has great potentials, many researchers' attention was attracted to this technique and active research was made. As a result, passenger cars equipped with 4WS systems were put on the market a few years ago. This report tries to identify the essential elements of the 4WS technology in terms of vehicle dynamics and control techniques. Based on the findings of this investigation, the report gives a mechanism of electronically controlling the steering system depending on the variable pressure applied on it. This enhances the controlling and smoothens the operation of steering mechanism.

Under Pressure: Mechanochemical Effects on Structure and Ion Conduction in the Sodium-Ion Solid Electrolyte Na3PS4

2020 ◽  
Author(s):  
Theodosios Famprikis ◽  
O. Ulas Kudu ◽  
James Dawson ◽  
Pieremanuele Canepa ◽  
François Fauth ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Mechanochemical Synthesis ◽  
Activation Volume ◽  
External Pressure ◽  
Sodium Ion ◽  
Variable Pressure ◽  
Ion Conductor ◽  
Ceramic Synthesis ◽  
Solid State Batteries ◽  
Fast Ion

<div> <p>Fast-ion conductors are critical to the development of solid-state batteries. The effects of mechanochemical synthesis that lead to increased ionic conductivity in an archetypical sodium-ion conductor Na<sub>3</sub>PS<sub>4</sub> are not fully understood. We present here a comprehensive analysis based on diffraction (Bragg, pair distribution function), spectroscopy (impedance, Raman, NMR, INS) and <i>ab-initio</i> simulations aimed at elucidating the synthesis-property relationships in Na<sub>3</sub>PS<sub>4</sub>. We consolidate previously reported interpretations about the local structure of ball-milled samples, underlining the sodium disorder and showing that a local tetragonal framework more accurately describes the structure than the originally proposed cubic one. Through variable-pressure impedance spectroscopy measurements, we report for the first time the activation volume for Na<sup>+</sup> migration in Na<sub>3</sub>PS<sub>4</sub>, which is ~30% higher for the ball-milled samples. Moreover, we show that the effect of ball-milling on increasing the ionic conductivity of Na<sub>3</sub>PS<sub>4</sub> to ~10<sup>-4</sup> S/cm can be reproduced by applying external pressure on a sample from conventional high temperature ceramic synthesis. We conclude that the key effects of mechanochemical synthesis on the properties of solid electrolytes can be analyzed and understood in terms of pressure, strain and activation volume.</p> </div>

Sign in / Sign up

Export Citation Format

Share Document