✍ Scribed by Adamo Fini; Giuseppe Fazio; Francesca Rosetti; M. Angeles Holgado; Ana Iruín; Josefa Alvarez-Fuentes
No coin nor oath required. For personal study only.
Diclofenac salts containing the alkaline and two earth alkaline cations have been prepared and characterized by scanning electron microscopy (SEM) and EDAX spectroscopy; and by thermal and thermogravimetric analysis (TGA): all of them crystallize as hydrate when precipitated from water. The salts dehydrate at room temperature and more easily on heating, but recovery the hydration, when placed in a humid environment. X-ray diffraction spectra suggest that on dehydration new peaks appear on diffractograms and the lattice of the salts partially looses crystallinity. This phenomenon is readily visible in the case of the calcium and magnesium salts, whose thermograms display a crystallization exotherm, before melting or decomposing at temperatures near or above 2008C; these last salts appear to form solvates, when prepared from methanol. The thermogram of each salt shows a complex endotherm of dehydration about 1008C; the calcium salt displays two endotherms, well separated at about 120 and 1608C, which disappear after prolonged heating. Decomposition exotherms, before or soon after the melting, appear below 3008C. The ammonium salt is thermally unstable and, when heated to start dehydration, dissociates and leaves acidic diclofenac.
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## Abstract In this work, we analyze the geometry and electronic structure of the [X~__n__~M~3~]^__n__−2^ species (M = Be, Mg, and Ca; X = Li, Na, and K; __n__ = 0, 1, and 2), with special emphasis on the electron delocalization properties and aromaticity of the __cyclo__‐[M~3~]^2−^ unit. The __cyc
Sodium and potassium diclofenac salts form hydrates when crystallized from water; the sodium salt contains four crystallization water molecules, while the potassium salt precipitates as a dihydrate. Crystallization from organic solvents occurs with a change of the crystal habit. The fractal dimensio
Page 2766. After several tests, in our previous manuscript, 1 we concluded that ''the 1 A 1 0 () state is the ground state of cyclo-[M 3 ] 2À (M ¼ Be, Mg, and Ca) species.'' After the publication of our work, Giri et al. 2 reported that the triplet state for these cyclo-[M 3 ] 2À species is more sta