Departamento de Química, Universidad Nacional del Sur, Bahía Blanca, Buenos Aires, Argentina.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Apr;75(4):1283-8. doi: 10.1016/j.saa.2009.12.059. Epub 2010 Jan 4.
An ATR-FTIR study of the vibrational spectra of N,N-bis(2-hydroxyethyl) aminomethylphosphonic acid (BHAMP), 1-hydroxyethane-1,1'-diphosphonic acid (HEDP) and nitrilotris(methylenephosphonic acid) (NTMP) adsorbed onto boehmite is presented. The study was performed in the pH range from 5 to 9, and bands assignments are given in the 1200-900 cm(-1) wavenumber range, where the bands associated with various P-O(H) vibrations can be found. The three phosphonic acids adsorb onto boehmite by forming inner-sphere surface complexes. ATR-FTIR data indicates the presence of both protonated and deprotonated mononuclear surface species. In all cases, the surface-bound ions undergo protonation reactions as pH is decreased. The results are in good agreement with previously proposed surface complexation models.
采用衰减全反射傅里叶变换红外光谱（ATR-FTIR）研究了 N,N-双（2-羟乙基）氨甲基膦酸（BHAMP）、1-羟基亚乙基-1,1-二膦酸（HEDP）和氮川三（亚甲基膦酸）（NTMP）在勃姆石上吸附的振动光谱。该研究在 pH 值为 5 至 9 的范围内进行，给出了波数范围在 1200-900 cm(-1) 内的带分配，其中可以找到与各种 P-O(H) 振动相关的带。三种膦酸通过形成内球表面配合物吸附在勃姆石上。ATR-FTIR 数据表明存在质子化和去质子化的单核表面物种。在所有情况下，随着 pH 值的降低，表面结合离子都会发生质子化反应。结果与先前提出的表面络合模型非常吻合。
