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research article

The Periodic Table and Kinetics?

Helm, Lothar  
•
Merbach, Andre E.  
March 1, 2019
Chimia

Mendeleev in his first publication ordered the chemical elements following an apparent periodicity of properties such as atomic volume and valence. The reactivity of the elements was only studied systematically many years later. To illustrate the systematic variation of kinetics across the periodic table we compare water residence times for monoatomic ions in aqueous solution. A tremendous variation of tau(H2O) by over 20 orders of magnitude is found, ranging from similar to 10 ps to about 200 years. Apart from some small +2 and +3 cations, all main group elements have very short residence times <10 ns. Transition metal cations of the d-block have water residence times that depend on the electronic configuration. tau(H2O )of lanthanide ions are surprisingly short with values of 10 ns and shorter. This is due to an equilibrium between 8 and 9 coordinated ions leading to a low energy of the transition state for the water exchange reaction.

  • Details
  • Metrics
Type
research article
DOI
10.2533/chimia.2019.179
Web of Science ID

WOS:000463433100006

Author(s)
Helm, Lothar  
Merbach, Andre E.  
Date Issued

2019-03-01

Published in
Chimia
Volume

73

Issue

3

Start page

179

End page

184

Subjects

Chemistry, Multidisciplinary

•

Chemistry

•

ions in solution

•

periodic table

•

water exchange

•

pressure nmr kinetics

•

water-exchange

•

variable-temperature

•

solvent-exchange

•

aqueous-solutions

•

o-17 nmr

•

molecular-mechanism

•

chloride-ions

•

metal-ions

•

aqua ion

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCIB  
Available on Infoscience
June 18, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/156942
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