Abstract
The local environment of rubidium ion in aqueous rubidium tetraborate solutions was investigated using extended X-ray absorption fine structure. The Rb–O distance and coordination number in the first hydration shell of rubidium ion are 2.92 A and 8.0, respectively. The distribution map of borate anions was calculated using the Newton iteration method, and further verified using nuclear magnetic resonance spectroscopy (NMR). This shows that the dominant species are $${\text{B}}_{4} {\text{O}}_{5} \left( {{\text{OH}}} \right)_{4}^{2 - }$$ and $${\text{B}}_{3} {\text{O}}_{3} \left( {{\text{OH}}} \right)_{4}^{ - }$$ in aqueous rubidium tetraborate solutions at 298.15 K. The dominant species change to $${\text{B}}_{3} {\text{O}}_{3} \left( {{\text{OH}}} \right)_{4}^{ - }$$ and B(OH)3 at 333.15 K. Hydrolysis and polymerization coexist in aqueous rubidium tetraborate solutions with the changes of concentration and temperature.
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