Abstract
Here we propose an antipodal conjecture, which is based on the synthetic scheme of alkalide KC222+K-, to prepareK+KCO8-. By introducing the concept of antipodal salts of alkalides, K+KCO8- is defined as antipodal salt of KC222+K-. As Group 1 elements of the Periodic Table, the alkali metal K is conventionally considered to form chemical bonding through its 4s and 4p valence orbitals. Our theoretical results show that the 3d orbitals of K element in KCO8- participate in chemical bonding of KCO8-. This makes the alkali metal K shows typical transition metal chemical properties, which also provides the possibility for the synthesis of K+KCO8-. Based on the Born-Haber thermodynamic cycle, the upper-limit stable temperature of K+KCO8- is estimated to be 24.426 K. Our theoretical results indicate that antipodal salts of alkalides will be a new family of compounds with good synthetic prospects.
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