Disodium enneaborate is the traditional name for a salt of sodium, boron, oxygen, and hydrogen, with elemental formula Na2B9H22O20 or Na2B9O9·11H2O. It is the sodium borate with the highest boron/sodium ratio.[1]
Structure[edit]The correct formula has since been determined to be (Na+)2[B8O11(OH)4]2−·B(OH)3·2H2O. The anion is a linear polymer with repeating unit [−B8O11(OH)4−]2−. Sodium cations, water molecules, and undissociated boric acid molecules B(OH)3 lie between the chains, held by numerous hydrogen bonds.[1]
The compound crystallizes in the monoclinic crystal system with space group P21/n. The cell parameters are a = 1021.3 pm, b = 1294.0 pm, c = 1245.7 pm, β = 93.070°, V = 1.6440 nm3, and Z = 2. The sodium cations occur in groups of four with interatomic distances of 378.30 pm and 379.32 pm.[1]
Reactions[edit]Upon heating, disodium enneaborate initially becomes amorphous and then crystallizes as anhydrous disodium octaborate α-Na2B8O13 along with amorphous B2O3. Notably, the former contains octaborate fundamental building blocks that are topologically equivalent to those in the enneaborate.[1]
References[edit] ^ a b c d Doinita Neiner, Yulia V. Sevryugina, Larry S. Harrower, and Did M. Schubert (2017): "Structure and Properties of Sodium Enneaborate, Na2[B8O11(OH)4]·B(OH)3·2H2O". Inorganic Chemistry, volume 56, issue 12, pages 7175–7181. doi:10.1021/acs.inorgchem.7b00823 vteBorates H3BO3 He Li2B4O7 Be B +(CO3)+(C2O4) (NH4)3BO3NH4B5O8+NO3 O +F Ne Na2[B4O5(OH)4]·8H2ONaBO2NaBO3Na3BO3Na2B8O13 Mg3(BO3)2 AlBO3 Si -PO4+PO4 +S-SO4+SO4 +Cl Ar K2B4O7•4H2OKB5O8•4H2O Ca3(BO3)2 ScBO3 TiBO3 -VO4 Cr Mn3(BO3)2 Fe3(BO3)2FeBO3FeB(OH)4 Co3(BO3)2 Ni3(BO3)2 Cu3(BO3)2 Znx(BO3)x GaBO3-GaO4 -GeO4 -AsO4 -SeO4-SeO3+Se +Br Kr Rb3BO3RbB11O16(OH)2Rb[B5O6(OH)4]•2H2O Sr3(BO3)2 YBO3 ZrB2O5 Nb Mo Tc Ru Rh Pd Ag3BO3 Cd3(BO3)2 InBO3 Sn -SbBO4 -TeO4-TeO3 +I Xe Cs3BO3CsB5O8•4H2O BaB2O4 * Lu3B5O12 HfB2O5 Ta W Re Os Ir Pt Au Hg Tl3BO3 Pb3(BO3)2 BiBO3 Po At Rn Fr Ra ** Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og * LaB3O6 CeB3O6 Pr4B10O21 NdBO3 Pm Sm Eu Gd Tb Dy4B6O15Dy2B4O9 Ho4B6O15Ho2B4O9 ErBO3 Tm3B5O12 Yb3B5O12 ** Ac Th3(BO3)4 Pa U(BO3)2 Np Pu Am Cm Bk Cf[B6O8(OH)5] Es Fm Md No
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