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Vapochromic behaviour of a nickel()-quinonoid complex with dimensional changes between 1D and higher

The nickel( ii )-chloranilato complex {Ni(ca)(VM) 2 } n (H 2 ca = chloranilic acid, VM = coordinated vapour molecules, such as water) shows reversible vapochromism upon exposure to various vapours and subsequent drying by heating. In contrast to the Ni( ii )-quinonoid complex, [Ni(HL Me ) 2 ] (H 2 L...

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Published in:Dalton transactions : an international journal of inorganic chemistry 2021-07, Vol.5 (25), p.8696-873
Main Authors: Yano, Ryota, Yoshida, Masaki, Tsunenari, Takahiro, Sato-Tomita, Ayana, Nozawa, Shunsuke, Iida, Youhei, Matsunaga, Noriaki, Kobayashi, Atsushi, Kato, Masako
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Language:English
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Summary:The nickel( ii )-chloranilato complex {Ni(ca)(VM) 2 } n (H 2 ca = chloranilic acid, VM = coordinated vapour molecules, such as water) shows reversible vapochromism upon exposure to various vapours and subsequent drying by heating. In contrast to the Ni( ii )-quinonoid complex, [Ni(HL Me ) 2 ] (H 2 L Me = 4-methylamino-6-methyliminio-3-oxocyclohexa-1,4-dien-1-olate), which was reported to exhibit vapochromic spin-state switching between high and low spin states, the chloranilato complex does not change its spin state even after the removal of coordinated vapour molecules. X-ray absorption fine structure (XAFS) analysis revealed that the six-coordinate geometry of {Ni(ca)(VM) 2 } n was maintained even after the removal of vapour molecules, in contrast to the [Ni(HL Me ) 2 ] complex. The unique vapochromism that follows the dimensional change between 1D and higher is influenced by the relatively weaker ligand field of the chloranilate ligand. The nickel( ii )-chloranilato complex shows reversible vapochromism with changes in dimensionality upon exposure to various vapours and subsequent drying by heating.
ISSN:1477-9226
1477-9234
DOI:10.1039/d1dt00269d