Interaction of dimethyl methylphosphonate with metal oxides

Abstract

Fourier transform infrared (FTIR) spectroscopy was used to investigate the gas-solid interactions of dimethyl methylphosphonate (DMMP) with metal oxide surfaces. The surface species is bound to the surface through the P=0 bond. On titanium dioxide based powders, this bond could not be unambiguously seen. A correlation has been established between the labilization of the P=0 bond by chemisorption and the electronegativity of the cations. The adsorption is a slow activated process.

Thermal desorption of dimethyl methylphosphonate from MoO3

“…DMMP has been found to adsorb onto several metal oxides, including Al 2 O 3 [5,9,26,27], Fe 2 O 3 [9], MgO [5,9], ZnO [5], La 2 O 3 [9], SiO 2 [28,29], TiO 2 [5,21], CeO 2 [7,21], and WO 3 [5]. Of these, intact adsorption at room temperature occurs on TiO 2 [21], CeO 2 [21], and SiO 2 [28,29].…”

“…Under-coordinated metal atoms and hydroxyl groups are the common surface binding sites for the phosphoryl moiety of DMMP [1]. The most stable (0 1 0) surface of MoO 3 is oxygen-terminated with no inherent undercoordinated Mo atoms on the surface [4] and does not easily hydroxylate; thus, this surface contrasts with those previously studied [1,5]. Here, we continue our previous investigations of the adsorption of dimethyl methylphosphonate (DMMP), a common chemical warfare agent simulant, on polycrystalline MoO 3 [6].…”

Nanowires and Nanoribbons Formed by Methylphosphonic Acid

“…33 The main resemblance between nanoribbon and nanowire spectra is the broad band between 630 cm −1 and 1100 cm −1 , which may originate from several different vibration modes PO 2 , PO 3 , P-C, CH 3 , C-C, and C-O. [32][33][34][35][36][37][38] A detailed view of this band, with respective vibration association, is shown in Figure 9. [34][35][36][37][38][39] A comparison between these spectra with those in Ref.…”

“…[32][33][34][35][36][37][38] A detailed view of this band, with respective vibration association, is shown in Figure 9. [34][35][36][37][38][39] A comparison between these spectra with those in Ref. [34], which investigated MPA adsorption on alumina, suggests that both nanostructures are not only MPA adsorbed onto alumina, as their MPA-related bands are much more active than those in Ref.…”

“…8) is associated to P-C mode. [33][34][35][36][37][38] Therefore, the adsorption does not result on P-C cleavage as could be suspected from dephosphorilation pathway in metalloenzymes. Another interesting observation is a 20 cm −1 shift of the P O band in both nanowires and nanoribbons when compared with the same band of MPA (which is located at 1250 cm −1 )-see Figures 8 and 9.…”