Supramolecular structures containing ‘isolated’ pentaborate anions and non-metal cations: Crystal structures of [Me3NCH2CH2OH][B5O6(OH)4] and [4-MepyH, 4-Mepy][B5O6(OH)4]

Synthesis, spectroscopic and thermal characterization of non-metal cation (nmc) pentaborates salts containing 2-amino-5-nitropyridine and 2-amino-6-methylpyridine as cation

“…The 2-amino-5nitropyridine pentaborate spectrum has three peaks that are at 19.39 ppm attributed to trigonal free boric acid, at 12.77 ppm attributed to triborate structure and at 1.16 ppm tetrahedral center of pentaborate structure. These results agree with previous literature [25,[29][30][31].…”

Synthesis, XRD Studies and NLO Properties of [p-H2NC6H4CH2NH3][B5O6(OH)4]·1/2H2O and NLO Properties of Some Related Pentaborate(1−) Salts

“…This is not the case for 1 where the water molecules link between pentaborate(1-) anions and form part of the giant network (rather than as a cavity filler) resulting in a unique structure. Bond lengths and bond angles within the boroxole rings of the pentaborates are within ranges commonly seen in other pentaborate(1-) salts [4,5,[7][8][9][10][11][12][13][24][25][26] and in related boroxole containing systems [27][28][29]. Some summary data are given in the legend to Fig.…”

“…We have prepared a number of [NMC][B 5 O 6 (OH) 4 ] salts by the former method [7][8][9][10][11][12]. The principal aim of our studies was to investigate the role of the cation in these templating reactions using structural (XRD) and computational (DFT) methods [13,14].…”

Pentaborate(1-) Salts and a Tetraborate(2-) Salt Derived from C2- or C3-Linked Bis(alkylammonium) Dications: Synthesis, Characterization, and Structural (XRD) Studies

“…The pentaborate(1-) anion, although very stable in the solid-state and is readily templated by many organic cations [34], decomposes in aqueous solution as various equilibrium determined borate species are rapidly obtained and influenced by the boron concentration, the temperature and the pH of the aqueous solution [35,36]. However, 11 B spectra of 1-8 were obtained and these samples all showed three peaks centred at 1 (~5) 13 (~35%) and 18 (~60%) ppm in a pattern typical of solutions arising from pentaborate(1-) salts [31][32][33][34]37]. The 11 B spectra of 9, originating from a tetraborate(2-) salt, was significantly different with three peaks now at 1.3 (5%), 7.4 (43%) and 11.7 (52%).The upfield shift of the 'average' 11 B chemical shift on going from a pentaborate (1-) anion (1-8) to a tetraborate(2-) anion (9) is in accord with the average B/charge ratio changing from 5:1 to 2:1 [34].…”

“…O H-bond interactions. The acceptor sites for the four anion-anion H-bond interactions from each independent pentaborate(1-) anion can be codified [19,37] as α,β,α,α and α,α,α,β (two independent anions) for 2, α,α,α,γ for 3, α,β,α,α for 7, and α,β,α,α and α,α,β,α (two independent anions) for 8. Using Etter nomenclature [46] There is some disorder present in the cation and/or cocrystallized molecules all pentaborate(1-) anion structures except 3.…”