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Barium Azacryptand Sodide, the First Alkalide with an Alkaline Earth Cation, Also Contains a Novel Dimer, (Na2)2-

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journal contribution
posted on 29.01.2003 by Mikhail Y. Redko, Rui H. Huang, James E. Jackson, James F. Harrison, James L. Dye
The first barium sodide, with stoichiometry Ba2+(H5Azacryptand[2.2.2]-)Na-·2MeNH2, was synthesized by the reaction of Ba, Na, and H6Azacryptand[2.2.2] in NH3−MeNH2 solution. It was characterized by X-ray crystallography, 23Na MAS NMR, hydrogen evolution, DSC, optical spectroscopy, and magnetic susceptibility. This is the first sodide in which the sodium anions form (Na2)2- dimers. Previous theoretical predictions were verified by a calculation of the potential energy curve for the dimer in the field of the surrounding charges, whose positions were determined from the crystal structure.

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