Crystalline Salts of Na^- and K^- (Alkalides) that Are Stable at Room Temperature

Ab initio prediction of novel alkalides FLi2–M–Li2F (M = Li, Na and K)

“…The high reactivity of alkalide anion (Na‾) causes reductive cleavage of covalent bonds such as C-O bond in a cryptand ligand which destabilize most of the alkalides even at the room temperature. The room temperature stable alkalides such as K + (aza222)M‾ (M = Na, K) [4] have been designed using amines instead of ether linkages in cryptand. Alkalides based on the alkalide earth metal such as barium cation have also been synthesized and dimers of cationic as well as anionic Na have been observed [5].…”

“…The -1 oxidation state of the alkali metals is unusual and gives these salts powerful reducing properties and unique electro-optical properties such as nonlinear optical (NLO) behaviour. Chen et al [7] have designed a series of alkalides Li + (calix [4]pyrrole)M‾ (M = Li, Na, K) and discussed their NLO properties. They proposed that the NLO behaviour of these alkalides increases with the increase in the atomic number of alkali anion (M‾).…”

Effect of alkaline earth metal atom on the large static first hyperpolarizabilities of alkaline earth-based alkalides Be(NH3)nM (M=Be and Ca) in comparison with alkalides Li(NH3)nNa (n=1–3)

“…Alkalides are compounds containing anionic alkali metals (e.g., Na À , K À , Rb À , or Cs À ) [26]. Interestingly, the above reported alkali-doped compounds [13,[18][19][20][21][22] always exhibit the electride or alkalide features as the valence electron of an alkali atom is polarized by a ligand to form an excess electron.…”

Novel Superalkali Superhalogen Compounds (Li3)+(SH)−(SH=LiF2, BeF3, and BF4) with Aromaticity: New Electrides and Alkalides

“…At present, two typical compounds with excess electrons, "alkalides" [36][37][38][39] and "electrides", [40][41][42][43][44][45][46][47] have attracted considerable attention, owing to their broad or potential applications in chemical synthesis, catalysis, nanodevices, and functional materials. Alkalides are compounds containing anionic alkali metals (e.g.…”

“…Room-temperature stable alkalides, K + A C H T U N G T R E N N U N G (aza222)Na À and K + A C H T U N G T R E N N U N G (aza222)K À have been synthesized. [39] The counterparts to alkalides are electrides, in which alkali metals (Li through Cs) ionize to form bound alkali cations and excess electrons. [40,42] In these synthesized electrides, [42][43][44][45][46] the organic or inorganic species (e.g.…”