Synthesis and characterization of methylammonium phosphates as crystalline approximants for anhydrous, low melting phosphate glasses.

Low-melting methylammonium phosphate glasses are synthesized from crystalline starting agents. To this end crystalline tris(methylammonium) cyclotriphosphate [CHNH]PO, was synthesized by a novel and simple synthesis route from PO and -methylformamide. It, undergoes an irreversible phase transition to methylammonium -polyphosphate [CHNH]PO.

Investigation of Bistetramethylammonium Hydrogencyclotriphosphate-A Molecular Rotor?

The crystalline phase β-[N(CH ) ] HP O undergoes a reversible phase transition to γ-[N(CH ) ] HP O , which was studied by dynamic scanning calorimetry and X-ray diffraction. The rotational dynamics of the anion [P O ] were evident from variable temperature P magic angle spinning (MAS) NMR spectroscopy. The rotational dynamics could be simulated with a 3-site jump model, which yields spectra in good agreement with experiment.

Low temperature synthesis of ionic phosphates in dimethyl sulfoxide.

A new synthesis route for phosphates in an organic solvent at low temperatures is presented. The synthesis was done by dispersing a nitrate salt and phosphorus pentoxide in dimethyl sulfoxide. The synthesis can be performed under water-free conditions and yielded several organic and inorganic phosphates.

Linking 31P magnetic shielding tensors to crystal structures: experimental and theoretical studies on metal(II) aminotris(methylenephosphonates).

The (31)P chemical shift tensor of the phosphonate group [RC-PO(2)(OH)](-) is investigated with respect to its principal axis values and its orientation in a local coordinate system (LCS) defined from the P atom and the directly coordinated atoms. For this purpose, six crystalline metal aminotris(methylenephosphonates), MAMP·xH(2)O with M = Zn, Mg, Ca, Sr, Ba, and (2Na) and x = 3, 3, 4.5, 0, 0, and 1.

Occurrence of difluorine F2 in nature--in situ proof and quantification by NMR spectroscopy.

The most reactive chemical element, F(2), has been claimed not to occur in nature. First direct evidence from in situ NMR spectroscopy now proves that elemental F(2) indeed occurs in nature as an occlusion in "antozonite" (right in the picture), a variant of fluorite (CaF(2), left).