Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 73: Issue 3
A thermal and structural study on Lanthanum Hexacyanocobaltate(III) pentahydrate, La[Co(CN)6]·5H2O. Part III
Authors:
Y. Seto Niigata University Graduate School of Science and Technology Graduate School of Science and Technology 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

Search for other papers by Y. Seto in
Current site
Google Scholar
PubMed Close
,
S. Nagao Niigata University Department of Fuel Cycle Safety Research Graduate School of Science and Technology 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

Search for other papers by S. Nagao in
Current site
Google Scholar
PubMed Close
,
X. Wang Niigata University Graduate School of Science and Technology Graduate School of Science and Technology 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

Search for other papers by X. Wang in
Current site
Google Scholar
PubMed Close
, and
Y. Masuda Niigata University Department of Environmental Science,Faculty of Science Department of Environmental Science, Faculty of Science 2-8050 Ikarashi Niigata 950-2181 Japan 2-8050 Ikarashi Niigata 950-2181 Japan

Search for other papers by Y. Masuda in
Current site
Google Scholar
PubMed Close
Pages:
755–762
Online Publication Date:
31 Oct 2004
Publication Date:
01 Sep 2003
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1025874212520
Keywords:
dehydration; La[Co(CN)6]·5H2O; crystal structures
Restricted access

Abstract  

On dehydration of La[Co(CN)6]5H2O, the color of the complex, changes from white to pale blue at around 230C. Heating the pale blue specimen, the color changes to deep blue at around 290C. This deep blue specimen is easily rehydrated to a pink one. As reported previously, in the pale blue specimen, Co3+ ions are situated in the center of the D4h crystal field formed by six CN- ions. The deep blue specimen is due to the presence of [Co(CN)4]2- ions in which Co2+ was situated in a Td coordination field formed by four CN- ions and the Co-C bond length is 1.67 Ĺ. The pink species corresponded to trans-[Co(CN)4(H2O)2]2- and the bond lengths of Co-C and Co-O are 1.89 and 1.85 Ĺ, respectively. The Raman spectra of the complex observed at 25C displays two bands at 2157 and 2176 cm-1 associated with the vibration of C-N bond, and the band of 2157 cm-1 was split into two bands, 2150 and 2156 cm-1, at around 100C. When the complex was heated to around 230C, three new bands were observed at 2103, 2116 and 2141 cm-1. The bands of 2103 and 2116 cm-1 were assigned to the stretching vibration of C=N bonding to Co2+. The band of 2141 cm-1 was assigned to the stretching vibration of the inverted CN- as follows: Co-C=N-La→Co-N=C-La. The activation energy for the inversion of CN- was estimated as 67 kJ mol-1.

  • Collapse
  • Expand
Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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 Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
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 1388-6150 (Print)
ISSN 1588-2926 (Online)

Monthly Content Usage

Abstract Views Full Text Views PDF Downloads
Mar 2024 2 0 0
Apr 2024 18 0 0
May 2024 3 0 0
Jun 2024 3 0 0
Jul 2024 5 0 0
Aug 2024 6 0 0
Sep 2024 4 0 0