A New Organic‐Inorganic Hybrid Copper Pentaborate with Free Boric Acid Group

Abstract

The hydrothermal reaction of Cu(CH 3 COO) 2

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

“…[28]. The B-O bond lengths, OBO and BOB angles observed for the [B 4 O 5 (OH) 4 ] 2− and B(OH) 3 motifs are in accord with previous tetraborate(2-)[47][48][49][50][51][52][53][54][55][56] and polyborates with co-crystallized B(OH)3 [32,33,39,55,57,58]; for full details see the Supplementary Information.…”

“…However, there are no direct anion-anion interactions within the lattice and the B(OH)3 units serve to bridge tetraborate(2-) anions by acting as ′spacers′ to expand the lattice so that it can accommodate the relatively large cation, [Me3N(CH2)2NMe3]. This spacer role for B(OH)3 has been observed before [32,33,39,[55][56][57][58]. With reference to Figure 6 it can be seen that the H-bond structure can be envisaged as ′horizontal′ chains of alternating [B4O5(OH)4] 2-/B(OH)3 units held together by R2 2 (8) interaction, crosslinked by ′vertical′ C2 2 (8) chains (involving O8,H8 … O12,H12 … O5,B1,O2,B3) in a regular 2D arrangement.…”

“…Using Etter nomenclature [46] the H-bond interactions per pentaborate are 3 R2 2 (8) and 1 R2 2 (12) for 2, and 3 R2 2 (8) and 1 C(8) for 3, 7, and 8. Compound 7 adopts the familiar ′herringbone′ structure [29,31] The structural characterization of 9 is considered in more detail in this manuscript since it contains a tetraborate(2-) anion and there are far fewer crystallographic reports in the literature featuring this anion; the anion is found partnered with 2Na + in the well-known borax [47,48] but is less commonly found with non-metal cation [40,[49][50][51][52] or transition metal cation salts [53][54][55][56].…”

Recent advances in crystalline hydrated borates with non-metal or transition-metal complex cations

“…The majority of compounds described in this review have been prepared in aqueous solution by simply mixing reactants [10,[16][17][18][19]25,27,31,[39][40][41][43][44][45]48,50,52,54,56,59,62,75,87,93,95,96,100] or by use of hydrothermal [20,22,26,28,30,32,34,37,47,53,57,[63][64][65][70][71][72]79,82,84,102,115] or solvothermal [35,3...…”