“…Using Etter nomenclature [46] There is some disorder present in the cation and/or cocrystallized molecules all pentaborate(1-) anion structures except 3. Bond lengths and bond angles found for C, N atoms within the organic cations [19,28,37,40,41] are as expected as are the B-O bond lengths, OBO and BOB angles observed for the [B5O6(OH)4] − anion [19,21,28,29,[31][32][33][34][35]; for full details see the Supplementary Information. H-bonding interactions within polyborate salts are extremely common and anion-anion interactions between pentaborate(1-) units, forming giant lattices, are well documented and are signaled as a strong driving force [5,29,34] in templating the crystallization of these anions from the Dynamic Combinatorial Library [42][43][44][45] arising from B(OH)3 under basic conditions [35,36].…”