Electrochromism and electrochemical properties of complexes of transition metal ions with benzimidazole-based ligand
Six new mononuclear complexes of transition metal ions ( 1–6 ) with ( E )-2-(1-methyl-2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)-1 H -benzoimidazole L were synthesized and characterized by spectroscopic methods as well as X-ray diffraction analysis. Structures of these complexes can be divided into t...
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Published in | RSC advances Vol. 7; no. 80; pp. 50858 - 50867 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
2017
|
Online Access | Get full text |
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Summary: | Six new mononuclear complexes of transition metal ions (
1–6
) with (
E
)-2-(1-methyl-2-(1-(pyridin-2-yl)ethylidene)hydrazinyl)-1
H
-benzoimidazole
L
were synthesized and characterized by spectroscopic methods as well as X-ray diffraction analysis. Structures of these complexes can be divided into three groups depending on the coordination number and environment of the metallic center: the first one of general formula [ML
2
]X
2
, the second one - [MLX
3
] and the third one - [MLX
2
], where X is anion or solvent molecule. Electrochemical and electrochromic properties of complexes were investigated. Complexes Fe(
ii
)
1
, Cu(
ii
)
2–4
and Co(
ii
)
5
were found to be electroactive and their colors depend on the oxidation state of metal center and ligand molecule. Fe(
ii
) complex
1
exhibits purple color in the neutral state and its color changes to yellow after Fe(
ii
) → Fe(
iii
) oxidation, followed by pale-yellow after further oxidation of ligand molecule and to green when the metal center is reduced to Fe(
i
). The original color can be restored after electrochemical oxidation Fe(
i
) to Fe(
ii
). It was found that this complex exhibits high color stability in solution during multiple oxidation/reduction cycles. This complex can be therefore regarded as very interesting material for the construction of multielectrochromic devices. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C7RA10451K |