Deuteration and Vibrational Spectra of Dimethylammonium Paratungstate‐B Hydrates

Abstract

Infrared and Raman spectra of two solvatomorphs of a new dimethylammonium polytungstate decakis(dimethylammonium) dihydrogendodecatungstate, (Me 2 NH 2)(H 2 W 12 O 42)•nH 2 O (n = 10 or 11), were evaluated and discussed. The assignment of bands corresponding to the cationic and anionic components as well as the water of crystallization is presented. Deuteration has been used in the interpretation of the spectra. The dimethylammonium cation and the molecules of water

Thermal analysis of solvatomorphic decakis (dimethylammonium) dihydrogendodecatungstate hydrates

“…In the present work, continuing our work on dimethylammonium dihydrogendodecatungstate solvatomorphs, [8,9] the results of combined thermal studies (…”

“…The white powdery material was recrystallized from water to obtain compound 1b. Both compounds were identified by their IR and XRD traces [8,9]. X-ray powder diffraction measurements were performed on a Philips PW-1050 system with a Bragg-Brentano parafocusing goniometer.…”

“…Alkylamino polytungstates [4][5][6][7], containing reducing alkylammonium cations with oxidizing polytungstate anions, are particularly interesting because of the possibility of self-oxidation, and because the cation may be volatilized. Recently, some polymorphic and solvatomorphic dimethylammonium dihydrogendodecatungstates have been synthesized [4,8,9]. The structure of these modifications is remarkably different, their water content is also different, and the cation-anion interactions [8] involve numerous biand multifurcated hydrogen bonds.…”

(Me2NH2)10[H2-Dodecatungstate] polymorphs: dodecatungstate cages embedded in a variable dimethylammonium cation + water of crystallization matrix

“…From this we learned that the O-H stretch, H-O-H bend and the N-H stretch frequencies are really shied towards lower wave numbers with respect to their gas-phase positions, indicating that the hydrogen atoms of these bonds are donated into hydrogen bonds. [35][36][37] The peaks are also smeared out and their separability remains limited even aer complete deuteration. From this one can conclude that there are many kinds of N-H/O and O-H/(O,N,C) hydrogen bonds with different strength.…”

AgNO3⋅NH4NO3 – an enigmatic double‐salt type “decomposition intermediate” of diamminesilver(I) permanganate

“…The compound 1 was prepared in the thermal decomposition reaction of compound 2 and the aqueous leaching of the decomposition residue following the method given in. [7] The detailed description of the applied instruments can be found in our previous publications: [11][12][13][14][15][16] IR (Bruker Alpha FT-IR spectrometer attenuated total reflection mode, 2 cm À 1 resolution), far-IR (BioRad-Digilab FTS-60 A, attenuated reflection mode, 4 cm À 1 resolution) UV(Jasco V-670 UV-Vis spectrophotometer equipped with NV-470 type integrating sphere), Raman (Horiba Jobin-Yvon LabRAM-type microspectrometer, l 532 nm Nd-YAG and 785 nm diode laser, an Olympus BX-40 optical microscope), and PXRD (Philips PW-1050 Bragg-Brentano parafocusing goniometer with Cu tube), TG-MS (TA Instruments SDT Q600 thermal analyzer coupled to Hiden Analytical HPR-20/QIC mass spectrometer), DSC (Perkin Elmer Diamond DSC).…”