Fluxionality and lability in rhenium 4′-hydroxyterpyridine complexes: Evidence for an associative mechanism and correlated fluxionality and lability

2010 ◽  
Vol 39 (32) ◽  
pp. 7493 ◽  
Author(s):  
Vanesa Fernández-Moreira ◽  
Flora L. Thorp-Greenwood ◽  
Richard J. Arthur ◽  
Benson M. Kariuki ◽  
Robert L. Jenkins ◽  
...  
2020 ◽  
Author(s):  
Deon T. Benton ◽  
David H. Rakison

The ability to reason about causal events in the world is fundamental to cognition. Despite the importance of this ability, little is known about how adults represent causal events, what structure or form those representations take, and what the mechanism is that underpins such representations. We report four experiments with adults that examine the perceptual basis on which adults represent four-object launching sequences (Experiments 1 and 2), whether adults representations reflect sensitivity to the causal, perceptual, or causal and perceptual relation among the objects that comprise such sequences (Experiment 3), and whether such representations extend beyond spatiotemporal contiguity to include other low-level stimulus features such as an object’s shape and color (Experiment 4). Based on these results of the four experiments, we argue that a domain-general associative mechanism, rather a modular, domain-specific, mechanism subserves adults’ representations of four-object launching sequences.


1984 ◽  
Vol 39 (12) ◽  
pp. 1755-1758 ◽  
Author(s):  
Franz L. Dickert ◽  
Walter Gumbrecht ◽  
Manfred Waidhas

The metal ions Co++ , Ni++ , Mg++ , and Zn++ form the sandwich complexes [M([12]crown-4)2]++ with [12]crown-4 in CD3NO2. From the reaction order of the crown ether exchange a strong outer sphere association between complex and ligand can be inferred. Ligand fluctuation processes occur via an intramolecular associative mechanism from which a very high symmetry of the complexes results.


2019 ◽  
Vol 48 (45) ◽  
pp. 16936-16942 ◽  
Author(s):  
Samuel R. Lawrence ◽  
David B. Cordes ◽  
Alexandra M. Z. Slawin ◽  
Andreas Stasch

Exchange of anionic ligands on the Mg22+ ion via an associative mechanism can be facile and depends on ligand sterics and shape.


1984 ◽  
Vol 106 (26) ◽  
pp. 8181-8188 ◽  
Author(s):  
Kazuyuki Tatsumi ◽  
Akira Nakamura ◽  
Sanshiro Komiya ◽  
Akio Yamamoto ◽  
Takakazu Yamamoto

2019 ◽  
Vol 44 (2) ◽  
pp. 122-131
Author(s):  
Bangchang Qin ◽  
Yang Tian ◽  
Pengxiang Zhang ◽  
Zuoyin Yang ◽  
Guoxin Zhang ◽  
...  

Density functional theory calculations were employed to investigate the electrochemical oxygen reduction reaction on the (111) and (100) surfaces of cobalt(II) oxide. Different mechanisms were applied to evaluate the oxygen reduction reaction performance of cobalt(II) oxide structures in terms of the Gibbs free energy and density of states. A variety of intermediate structures based on associative and dissociative mechanisms were constructed and optimized. As a result, we estimated the catalytic activity by calculating the free energy of the intermediates and constructing free energy diagrams, which suggested that the oxygen reduction reaction Gibbs free energy on cobalt(II) oxide (111) and (100) surfaces based on the associative mechanism is smaller than that based on the dissociative mechanism, demonstrating that the associative mechanism should be more likely to be the oxygen reduction reaction pathway. Moreover, the theoretical oxygen reduction reaction activity on the cobalt(II) oxide (111) surface was found to be higher than that on the cobalt(II) oxide (100) surface. These results shed light on the rational design of high-performance cobalt(II) oxide oxygen reduction reaction catalysts.


Sign in / Sign up

Export Citation Format

Share Document