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"Murakami, Tatsunari"
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Color-change behavior of a bis(benzimidazole)-coordinated nickel-dichlorido complex induced by the adsorption of pyridine or ammonia vapor
Pyridine (py) and ammonia (NH
3
) have been widely used as raw materials in manufacturing processes; however, both are volatile, and their vapor is detrimental to human health. To limit the exposure of those who work with py and NH
3
vapor, the development of effective techniques to sense atmospheric levels of py and NH
3
in order to decrease their concentration when required is important. In the present study, we found that crystals of bis(benzimidazole)NiCl
2
(
1
, bis(benzimidazole) = phenylbis(benzimidazol-2-yl)methane)) adsorb py and NH
3
vapor with a concomitant color change from purple to green (py) or light purple (NH
3
). Powder X-ray diffraction, UV–Vis diffuse reflectance, and IR spectroscopic studies revealed that these color changes are induced by the formation of
trans-
[NiCl
2
(py)
4
] (
2
) or [Ni(NH
3
)
6
]Cl
2
(
3
). A time-dependent analysis of the py-vapor adsorption indicated that the formation of
2
from
1
proceeds non-uniformly in the solid. Crystals of
1
were furthermore found to adsorb py or NH
3
even at low concentrations (py: ~ 6 ppm; NH
3
: ~ 33 ppm), albeit that a color change was not observed in these cases.
Graphical abstract
Journal Article