Pyrazine-imide complexes: reversible redox and MOF building blocks

2015 ◽  
Vol 44 (6) ◽  
pp. 2880-2892 ◽  
Author(s):  
Matthew G. Cowan ◽  
Reece G. Miller ◽  
Sally Brooker
Keyword(s):  
Oxidation State ◽  
Building Blocks ◽  
Redox Couple ◽  
Reversible Redox ◽  
The Stability

Stepwise exchange of pyrazine for pyridine, in three bis-heterocycle-based imide ligands, tunes the potential of the [MII/III(ligand)2]0/+ redox couple, increasing the stability of the MII oxidation state by about 0.1 V per exchange.

scholarly journals Rotaxane synthesis exploiting the M(i)/M(iii) redox couple

2017 ◽  
Vol 46 (35) ◽  
pp. 11645-11655 ◽  
Author(s):  
Jack Emerson-King ◽  
Richard C. Knighton ◽  
Matthew R. Gyton ◽  
Adrian B. Chaplin
Keyword(s):  
Building Blocks ◽  
Redox Couple ◽  
Interlocked Molecules

In the context of advancing the use of metal-based building blocks for the construction of new and interesting mechanically interlocked molecules, we herein describe the preparation of rhodium and iridium containing [2]rotaxanes.

Discrete-time Inversion Model Control of a Double-damper System with Uncertain Parameters

2017 ◽  
Vol 6 (3) ◽  
pp. 168
Author(s):  
Marwa Hannachi ◽  
Ikbel Bencheikh Ahmed ◽  
Dhaou Soudani
Keyword(s):  
Discrete Time ◽  
Algebraic Approach ◽  
Building Blocks ◽  
Internal Model Control ◽  
Linear Matrix ◽  
Stability Conditions ◽  
Time Inversion ◽  
Time Model ◽  
Model Control ◽  
The Stability

<span>This paper addresses the control at discrete time of physical complex systems multi-inputs multi-outputs with variables parameters. Classified among the robust control laws the Internal Model Control (IMC) is adopted in this work to ensure the desired performances adjacent to the complexities of the system. However, the application of this control strategy requires that these different building blocks be open loop stable, which invites us, on the one hand, to apply the algebraic approach of Kharitinov for delimiting the summits stability domain’s system. On the other case, the Linear Matrix Inequalities (LMI) approach is applied to determine the corrector’s stability conditions obtained by a specific inversion of the chosen model. It is in this sense that we contribute by this work to execute the command by inversion the discrete-time model in order to ensure the stability and to maintain the performances the stability conditions of required for the double damper system with variable parameters.</span>

Regulating the stability of 2D crystal structures using an oxidation state-dependent molecular conformation

2006 ◽  
pp. 2320 ◽  
Author(s):  
Jonathan P. Hill ◽  
Yutaka Wakayama ◽  
Wolfgang Schmitt ◽  
Tohru Tsuruoka ◽  
Takashi Nakanishi ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Oxidation State ◽  
Molecular Conformation ◽  
State Dependent ◽  
The Stability

scholarly journals Influence of perylenediimide–pyrene supramolecular interactions on the stability of DNA-based hybrids: Importance of electrostatic complementarity

2014 ◽  
Vol 10 ◽  
pp. 1589-1595 ◽  
Author(s):  
Christian B Winiger ◽  
Simon M Langenegger ◽  
Oleg Khorev ◽  
Robert Häner
Keyword(s):  
Double Helix ◽  
Building Blocks ◽  
Supramolecular Interactions ◽  
Stacking Interactions ◽  
Average Value ◽  
Π Stacking ◽  
Dna Strands ◽  
Polycyclic Aromatic ◽  
The Stability ◽  
Dna Double Helix

Aromatic π–π stacking interactions are ubiquitous in nature, medicinal chemistry and materials sciences. They play a crucial role in the stacking of nucleobases, thus stabilising the DNA double helix. The following paper describes a series of chimeric DNA–polycyclic aromatic hydrocarbon (PAH) hybrids. The PAH building blocks are electron-rich pyrene and electron-poor perylenediimide (PDI), and were incorporated into complementary DNA strands. The hybrids contain different numbers of pyrene–PDI interactions that were found to directly influence duplex stability. As the pyrene–PDI ratio approaches 1:1, the stability of the duplexes increases with an average value of 7.5 °C per pyrene–PDI supramolecular interaction indicating the importance of electrostatic complementarity for aromatic π–π stacking interactions.

Structural architecture of wearable materials based on tri-component elastic-conductive composite yarn: toward a Joule heating application

2018 ◽  
Vol 89 (16) ◽  
pp. 3303-3311 ◽  
Author(s):  
Yong Wang ◽  
Stuart Gordon ◽  
Weidong Yu ◽  
Fumei Wang
Keyword(s):  
Local Heating ◽  
Thermal Response ◽  
Building Blocks ◽  
Conductive Composite ◽  
Knit Fabrics ◽  
Conductive Yarns ◽  
Significant Step ◽  
Highly Stretchable ◽  
The Stability ◽  
Structural Architecture

Highly stretchable and conductive yarns have attracted considerable interest as the building blocks for the next generation of wearable textiles. A method for producing tri-component elastic-conductive composite yarns (t-ECCYs) was reported previously. The objectives of this research were to investigate the thermal response and stability of a single t-ECCY, in fabric form, under different voltages and strain loads. The investigation showed that the yarn responded rapidly in terms of thermal response and showed a uniform surface temperature distribution under various applied voltages and strain deformations conditions. The stability of the yarn was also confirmed by alternating voltage on–off cycles. The performances of the yarn both in static and dynamic modes demonstrated its potentials in applying specific but uniform heat to garments. The results indicated that the t-ECCY-decorated knit fabrics were not only suitable for functions such as displaying and local heating, but also possessed good cyclic stability with little degradation in their functional properties after 50 cyclic, expand–release strain tests. The straightforward fabrication and excellent multifunctional features of the yarn represent a significant step forward in the further design and development of topologically complex, stretchable and wearable heating electronics.

On transition of the pulsatile pipe flow

1986 ◽  
Vol 170 ◽  
pp. 169-197 ◽  
Author(s):  
J. C. Stettler ◽  
A. K. M. Fazle Hussain
Keyword(s):  
Steady Flow ◽  
Pipe Flow ◽  
Three Dimensional ◽  
Building Blocks ◽  
Rate Of Change ◽  
Turbulent Pipe Flow ◽  
Dimensional Parameter ◽  
Pipe Length ◽  
The Mean ◽  
The Stability

Transition in a pipe flow with a superimposed sinusoidal modulation has been studied in a straight circular water pipe using laser-Doppler anemometer (LDA) techniques. This study has determined the stability–transition boundary in the three-dimensional parameter space defined by the mean and modulation Reynolds numbers Rem, Remω and the frequency parameter λ. Furthermore, it documents the mean passage frequency Fp of ‘turbulent plugs’ as functions of Rem’ Remω and λ. This study also delineates the conditions when plugs occur randomly in time (as in the steady flow) or phase-locked with the excitation. The periodic flow requires a new definition of the transitional Reynolds number Rer, identified on the basis of the rate of change of Fp with Rem. The extent of increase or decrease in Rer from the corresponding steady flow value depends on λ and Remω. At any Rem and Remω, maximum stabilization occurs at λ ≈ 5. With increasing Remω, the ‘stabilization bandwidth’ of modulation frequencies increases and then abruptly decreases after levelling off. The maximum stabilization bandwidth depends strongly on Rem, decreasing with increasing Rem. Previously reported observations of turbulence during deceleration, followed by a relaminarization during acceleration, can be explained in terms of a new phenomenon: namely, periodic modulation produces longitudinally periodic cells of turbulent fluid ‘plugs’ which differ in structural details from ‘puffs’ or ‘slugs’ in steady transitional pipe flows and are called patches. The length of a patch could be increased continuously from zero to the entire pipe length by increasing Rem. This tends to question the concept that all turbulent plugs (and even the fully-turbulent pipe flow) consists of many identical elementary plugs as basic ‘building blocks’.

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