Synthesis and characterization of arsenate antimonic acid AAAc(1 : 1) |
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| Authors: | Wang Xue-wen Chen Qi-yuan Yin Zhou-lan Zhang Ping-min and Wang Yu-wen |
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| Affiliation: | (1) School of Metallurgical Science and Engineering, Central South University, 410083 Changsha, China;(2) School of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China;(3) Chemistry Department, Jinggangshan Normal College, 343009 Ji’an, China |
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| Abstract: | The AAAc(1 : 1) was synthesized in water by As2O3 and Sb2O3 with molar ratio of 1 : 1. AAAc(1 : 1) was characterized by Raman, IR, TG/DTG, DSC, XPS and XRD. The results show that there
are four peaks to v
s of As-OH, As-O-Sb, Sb-OH and Sb-O-Sb in Raman spectra of AAAc(1 : 1) at 100 – 1 000 cm−1. The solution of AAAc(1 : 1) was also titrated with KOH solution. The titration results show that AAAc(1 : 1) is a hexabasic
acid with dissociation constants of k
1=3.62 × 10−2, k
2=3.05 × 10−3, k
3=6.43 × 10−6, k
4 =9.78 × 10−8, k
5=1.32 × 10−11, k
6=3.87 × 10−12. AAAc(1 : 1) has a good solubility and stability in water, its solid obtained by free volatilizing water from its solution
under air at ambient temperature is amorphous. Chemical and thermal analysis show that the composition of AAAc(1 : 1) is As2O5 · Sb2O5 · 8H2O in air at 25 °C. AAAc(1 : 1) has the structure of AsO(OH)2-OH-Sb(OH)4-O-Sb(OH)4-OH-AsO(OH)2 or As(OH)3-O-Sb(OH)4-O-Sb(OH)4-O-As(OH)3 (isomerism) through experimental determination and geometry optimization.
Foundation item: Project(50274075) supported by the National Natural Science Foundation of China |
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| Keywords: | arsenic acid antimonic acid arsenate antimonic acid |
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