Conclusions
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1.
Hexafluorides may have a positive second electron affinity, i.e., their doubly-charged anions may be stable toward the loss of an electron.
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2.
Species with maximum possible second and higher electron affinity should be sought among polynuclear MnkXnk+1 compounds, where k is the maximal formal valence of atom M and X is a monovalent electronegative ligand.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1679–1682, July, 1989.
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Gutsev, G.L., Boldyrev, A.I. Problem of second and higher electron affinity of chemical compounds. Russ Chem Bull 38, 1541–1543 (1989). https://doi.org/10.1007/BF00978456
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DOI: https://doi.org/10.1007/BF00978456