Mohapatra and coworkers modified the surfaces of magnetite nanoparticles with 2-carboxyethyl phosphonic acid and carboxylic acid .
Spectra of the phosphonic acid polymers were obtained in [D.sub.2]O by adjusting the pH to 7.4 with NaOD.
Uptake and elimination of perfluorinated phosphonic acids in the rat.
amu, atomic mass units; PFPA, perfluoroalkyl phosphonic acid; PFPiA, perfluoroalkyl phosphinic acid.
The modification of Sn[O.sub.2] surfaces with phosphonic acids is attracting growing interest because of the applications of such hybrid materials in different fields.
From EDX determinations, the presence of phosphorus was confirmed for all the obtained samples, resulting in that the grafting process of Sn[O.sub.2] on phosphonic acids took place.
These compounds are defined as amino acid derivatives, in which the carboxylic acid group [-C(=O)OH] is replaced by the phosphonic acid moiety [-P(=O)[(OH).sub.2]] .
In this work, the [N-phenylamino(2-boronphenyl)-R-methyl] phosphonic acid ([PhN-(2-PhB[(OH).sub.2])-R-Me]P[O.sub.3][H.sub.2]) was investigated using Fourier-transform infrared and Fouriertransform Raman methods.
The relevant to the Chemical Weapon Convention scheduled chemicals with medium polarity (as phosphonic acid diesters) were found mainly in acetone fraction, which was almost free of hydrocarbons.
To avoid the column was contaminated with scheduled silylated compounds and to avoid false positive identifications, BSTFA was periodically injected into the column to show the contamination degree and to clean the injector from free phosphonic acid residues which could be present in the samples or were produced in the injector.
The amino-modified nanoparticles were used as precursor, the functionalization was carried out using a derivative of phosphonic acid
that undergoes easy formation of a self-assembled, strongly organic monolayer on the nanoparticle surface, and established mechanisms are the chemisorption of 2-AEP on INOPs for the introduction of polar functional groups onto the surface .
For example, a phosphonic acid
bound in tridentate form should result in just a broad band within 900-1200 [cm.sup.-1] and the total disappearance of the normal P=O and P-O=H bands.