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Published data concerning quantitative evaluation of the reactivity of cations in donor-acceptor interactions were analyzed. The “relative acceptor numbers” of C° 2+ , Mn 2+ , Ni 2+ , Al 3+ , and Ga 3+ were determined polarographically: 2.16±0.32, 2.25±0.23, ∼1.70, 2.35±0.27, and 2.42±0.21, respectively. The known “relative acceptor numbers” for 21 cations were systematized, and a linear correlation between the ionization potentials and “relative acceptor numbers” of “hard” cations was revealed.
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Buchikhin et al. (2007) studied this question.
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