Disodium enneaborate

Disodium enneaborate
Identifiers
3D model (JSmol)
  • Interactive image
InChI
  • InChI=1S/B8H4O15.BH3O3.2Na.2H2O/c9-1-14-2(10)17-6(16-1)19-7-18-5(13)22-8(23-7)20-3(11)15-4(12)21-8;2-1(3)4;;;;/h9-12H;2-4H;;;2*1H2/q-2;;2*+1;;
    Key: FUFQAFYJPUNFLR-UHFFFAOYSA-N
  • [Na+].[Na+].[O]B1O[B-]2(OB(O)OB(O)O2)OB(O1)O[B-]3OB(O)OB(O)O3.OB(O)O.O.O
Properties
Chemical formula
 B9H22Na2O20
Molar mass 485.43 g·mol−1
Related compounds
Related compounds
 Borax
Sodium pentaborate
Disodium octaborate
Trisodium borate
Sodium metaborate
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound

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

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

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

  1. ^ a b c d Doinita Neiner, Yulia V. Sevryugina, Larry S. Harrower, and David 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
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H3BO3 He
Li2B4O7 Be B +(CO3)
+(C2O4) 		(NH4)3BO3
+NO3 		O +F Ne
Na2[B4O5(OH)4]·8H2O
NaBO2
NaBO3
Na3BO3
Na2B8O13 		Mg3(BO3)2 AlBO3 Si -PO4
+PO4 		+S
-SO4
+SO4 		+Cl Ar
K2B4O7•4H2O
KB5O8•4H2O 		Ca3(BO3)2 ScBO3 TiBO3 -VO4 Cr Mn3(BO3)2 Fe3(BO3)2
FeBO3
FeB(OH)4 		Co3(BO3)2 Ni3(BO3)2 Cu3(BO3)2 Znx(BO3)x GaBO3
-GaO4 		-GeO4 -AsO4 -SeO4
-SeO3
+Se 		+Br Kr
Rb3BO3
RbB11O16(OH)2
Rb[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
Cs3BO3
CsB5O8•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 Dy4B6O15
Dy2B4O9 		Ho4B6O15
Ho2B4O9 		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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