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It may be added that repeated absorption measurements on the same sample of 2,2′-bipyridine etc. showed that the equilibrium state in chelate formation is generally attained in several hours at most; however, in the case of 2,9-dimethyl-1,10-phenanthroline chelate it was shown that it is necessary to wait overnight to get a truly time-independent absorption curve. This fact shows that there is also a steric effect on reaction velocity.
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Sone, K., Kato, M. Absorption spectra of nickel chelates of 2,2′-bipyridine, 1,10-phenanthroline and some of their methyl derivatives. Naturwissenschaften 45, 10 (1958). https://doi.org/10.1007/BF00631793
- Absorption Spectrum
- Methyl Derivative