FTIR and Raman Spectroscopic Study of Hydrated Ammonium Borates and Their Saturated Aqueous Solutions

Abstract

Abstract: FTIR and Raman Spectra of NH₄B₅O₈·4H₂O and (NH₄)₂B₈O₁₃·6H₂O and their saturated aqueous solutions were recorded respectively at 20 ℃. Fundamental vibrational modes were identified and the assignment of vibrational bands were made. Based on the characterization of vibration spectra, the FBB of (NH₄)₂B₈O₁₃·6H₂Owas predicted, as [B₇O₁₁(OH)·B(OH)₃] ^2-, and the strong and sharp band around 516 cm^-1 in Raman spectrum was tentatively assigned to its symmetric pulse vibration, firstly. According to the FTIR differential spectra and Raman spectra, both the main polyborate anions {B(OH)₃, [B ₃O₃(OH)₄] - and [B₅O₆(OH)₄]^-} and their interaction in borate saturated aqueous solution were proposed.

Key words: Hydrated ammonium borate, Polyborate anion, FTIR spectrum, Raman spectrum

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WANG Jiang, ZHU Li-Xia, XIA Shu-Ping, WANG Bo, GAO Shi-Yang . FTIR and Raman Spectroscopic Study of Hydrated Ammonium Borates and Their Saturated Aqueous Solutions[J]. Chem. J. Chinese Universities, 2004, 25(7): 1213.

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FTIR and Raman Spectroscopic Study of Hydrated Ammonium Borates and Their Saturated Aqueous Solutions

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