Structure of Aqueous Potassium Tetraborate Solutions

ISL OpenIR > 青海盐湖研究所知识仓储

	Structure of Aqueous Potassium Tetraborate Solutions
	Zhu Fayan1,2 ; Fang Chunhui1 ; Fang Yan1 ; Zhou Yongquan1 ; Xu Sha 1,2; Tao Song 1,2; Cao Lingdi 1,2
	2012-02-28
发表期刊	ACTA CHIMICA SINICA
ISSN	0567-7351
卷号	70 期号:4 页码:445-452
关键词	Potassium Tetraborate Solution Structure X-ray Scattering Contact Ion-pair Chemical Species Distribution
摘要	The pH of aqueous K2B4O7 solutions at 298.15 and 323.15 K at a wide range of concentration has been determined and the chemical species distribution of the solutions calculated from equilibrium constants by Newton iterative algorithm. The chemical species of typical samples were confirmed by Raman spectrum. The results show that the major species B4O5(OH)(4)(2-) and the minor chemical species B3O3(OH)(4)(-) and B(OH)(4)(-) exist in highly concentrated aqueous solutions. The structure of highly concentrated aqueous K2B4O7 solutions at 298 and 323 K was studied by X-ray scattering further. The interactions of intra-anion, interionic and intermolecular of B4O5(OH)(4)(2-), B3O3(OH)(4)(-) and B(OH)(4)(-) were descripted quantitatively by geometrical model and calculated by least square method. The model calculation and refinement provided distance and coordination number between atoms in boroxol six-member ring, which are in good agreement with the crystal structure. The order degree in intra-anion is high in concentrated aqueous solutions. At the same time, we gained information about the hydration number and hydration distance of K+, borate ions and contact ion-pair. We also briefly discussed the effect of temperature and concentration on solvent structure.
语种	英语
引用统计	正在获取...
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/2072
专题	青海盐湖研究所知识仓储盐湖资源与化学实验室
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China 2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhu Fayan,Fang Chunhui,Fang Yan,et al. Structure of Aqueous Potassium Tetraborate Solutions[J]. ACTA CHIMICA SINICA,2012,70(4):445-452.
APA	Zhu Fayan.,Fang Chunhui.,Fang Yan.,Zhou Yongquan.,Xu Sha.,...&Cao Lingdi.(2012).Structure of Aqueous Potassium Tetraborate Solutions.ACTA CHIMICA SINICA,70(4),445-452.
MLA	Zhu Fayan,et al."Structure of Aqueous Potassium Tetraborate Solutions".ACTA CHIMICA SINICA 70.4(2012):445-452.