Английская Википедия:Disodium enneaborate
Disodium enneaborate is the traditional name for a salt of sodium, boron, oxygen, and hydrogen, with elemental formula Шаблон:Chem2 or Шаблон:Chem2. It is the sodium borate with the highest boron/sodium ratio.[1]
Structure
The correct formula has since been determined to be Шаблон:Chem2. The anion is a linear polymer with repeating unit Шаблон:Chem2. Sodium cations, water molecules, and undissociated boric acid molecules Шаблон:Chem2 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-Шаблон:Chem2 along with amorphous Шаблон:Chem2. Notably, the former contains octaborate fundamental building blocks that are topologically equivalent to those in the enneaborate.[1]
References
- ↑ 1,0 1,1 1,2 1,3 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. Шаблон:Doi
