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Tartrate bridging ligands in divalent Co(II)/Co(III) dinuclear anion
ID
Kozlevčar, Bojan
(
Author
),
ID
Tihomirović, Maja
(
Author
),
ID
Počkaj, Marta
(
Author
),
ID
Jagličić, Zvonko
(
Author
)
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https://www.sciencedirect.com/science/article/pii/S0277538723005193
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Abstract
A cobalt(II/III) ionic compound with bridging tartaric acid ($H_4L$) anion ($CH_6N_3)3[Co_2^{II/III}(L)_2(H_2O)_2]·4H_2O$ 1 was synthesized. The crystallites were isolated from highly alkaline aqueous solution in the presence of guanidinium cations ($CH_6N_3)^+$ being then incorporated as counter ions. A determined structure reveals the dinuclear coordination anion with two cobalt centers, each within its distinctive coordination octahedron $CoO_6$ sphere showing different Co−O bond lengths. The metal center with shorter coordination bonds is assigned as Co(III), while the other with Co(II), all in agreement with overall net charge equilibrium. This involves three guanidinium cations, two tartrate(4-) anions, the latter within the coordination anion, as well as with bond valence sums for both cobalt centers. Both tartrates (L) are triply bonded on the Co(III) center, thus enabling $Co^{III}O_6$ coordination bonds. On the other hand, only two coordination bonds are enabled by each tartrate towards Co(II), while the remaining two in $Co^{II}O_6$ are completed by two terminal water molecules. The electronic spectrum shows clearly the d-d bands at 400 and 665 nm for Co(III), while at 520 nm for Co(II), for each CoO6, respectively. The temperature dependent magnetic susceptibility shows the paramagnetic behavior of the compound, due to the $d^7$ Co(II) ions being in a high spin state, while the $d^6$ low spin Co(III) ions are diamagnetic.
Language:
English
Keywords:
cobalt
,
tartrate
,
guanidine
,
structure
,
magnetism
Work type:
Abstract or summary
Typology:
1.01 - Original Scientific Article
Organization:
FKKT - Faculty of Chemistry and Chemical Technology
FGG - Faculty of Civil and Geodetic Engineering
Publication status:
Published
Publication version:
Version of Record
Publication date:
01.01.2024
Year:
2024
Number of pages:
11 str.
Numbering:
Vol. , art. 116797
PID:
20.500.12556/RUL-153183
UDC:
546.73:547.476.3-38
ISSN on article:
0277-5387
DOI:
10.1016/j.poly.2023.116797
COBISS.SI-ID:
178257155
Publication date in RUL:
20.12.2023
Views:
584
Downloads:
38
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Title:
Polyhedron
Shortened title:
Polyhedron
Publisher:
Elsevier
ISSN:
0277-5387
COBISS.SI-ID:
26153984
Licences
License:
CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:
The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Secondary language
Language:
Slovenian
Keywords:
kobalt
,
tartrat
,
gvanidin
,
struktura
,
magnetizem
Projects
Funder:
ARRS - Slovenian Research Agency
Project number:
P1-0175
Name:
Napredna anorganska kemija
Funder:
ARRS - Slovenian Research Agency
Project number:
P2-0348
Name:
Nove slikovno-analitske metode
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