On the postronium spin exchange reactions promoted by 3d aqua ions

A. Fantola Lazzarini; E. Lazzarini

doi:10.1007/bf02218164

Jump to Content

Journal of Radioanalytical and Nuclear Chemistry

Volume/Issue:: Volume 144: Issue 3

On the postronium spin exchange reactions promoted by 3d aqua ions

Authors:

A. Fantola Lazzarini

A. Fantola Lazzarini CeSNEF, Politecnico di Milano Istituto Ingegneria Nucleare Via Ponzio 34/3 20133 Milan Italy

Search for other papers by A. Fantola Lazzarini in
Current site
Google Scholar
PubMed

and

E. Lazzarini

E. Lazzarini CeSNEF, Politecnico di Milano Istituto Ingegneria Nucleare Via Ponzio 34/3 20133 Milan Italy

Search for other papers by E. Lazzarini in
Current site
Google Scholar
PubMed

View More View Less

Pages:: 203–213

Online Publication Date:: 23 Oct 2005

Publication Date:: 17 Feb 1990

Article Category:: Research Article

DOI:: https://doi.org/10.1007/bf02218164

Restricted access

Abstract

In order to ascertain possible relationships between the rate constants, K_SE, of positronium, Ps, spin exchange /SE/ reactions promoted by 3d aqua ions and the electron configuration of the ion, the K_SE's of Mn _aq²⁺ and Co _aq²⁺ aqua ions were measured together with that of [Cr(NH₃)₆]³⁺. The K_SE's values obtained are discussed together with those of the Cr _aq³⁺ , Fe _aq²⁺ , Ni _aq²⁺ and [Ni(NH₃)₆]²⁺ ions previously measured. It was found that Cr _aq³⁺ and Mn _aq²⁺ K_SE's are 1 M^–1ns^–1, while those of Fe _aq²⁺ , Co _aq²⁺ and Ni _aq²⁺ ions are 2.5 M^–1ns^–1. Thus the K_SE values of 3d aqua ions do not depend solely on the number of their unpaired electrons as it was found for the 4f aqua ions. The trend observed parallels that of the electron delocalization from the metal atom; the delocalization occurs only with Fe _aq²⁺ , Co _aq²⁺ and Ni _aq²⁺ ions, but not with the Cr _aq³⁺ and Mn _aq²⁺ aqua ions. The trend of the K_SE's of aqua, ammine and perhaps of chloro complexes parallels that of ligand capabilities to cause d-electron cloud expansion, and thus d-electron delocalization from metal atoms.

Save
Cite
Email this content

Share Link

Copy this link, or click below to email it to a friend
Email this content
or copy the link directly:

https://akjournals.com/abstract/journals/10967/144/3/article-p203.xml
The link was not copied. Your current browser may not support copying via this button.

Link copied successfully

Collapse
Expand

Journal of Radioanalytical and Nuclear Chemistry

Print ISSN:: 0236-5731

Online ISSN:: 1588-2780

To see the editorial board, please visit the website of Springer Nature.

Manuscript Submission: HERE

For subscription options, please visit the website of Springer Nature.

Journal of Radionalytical and Nuclear Chemistry
Language	English
Size	A4
Year of Foundation	1968
Volumes per Year	1
Issues per Year	12
Founder	Akadémiai Kiadó
Founder's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher	Akadémiai Kiadó Springer Nature Switzerland AG
Publisher's Address	H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible Publisher	Chief Executive Officer, Akadémiai Kiadó
ISSN	0236-5731 (Print)
ISSN	1588-2780 (Online)