Mixed-Metal Imidazolates Containing Alkali and Alkaline Earth Metals: Mechanochemical Synthesis and Crystal Structure of AMgIm (A = Na or K).

The first bimetallic imidazolates containing alkali and alkaline earth metals, NaMgIm and KMgIm, respectively, are prepared by mechanochemical synthesis and are reported in this paper. NaMgIm has been prepared by the reaction between NaIm and Mg(BH) as well as directly from NaIm and MgIm. Structural evolution and thermal stability were followed by an in situ high-temperature X-ray powder diffraction experiment utilizing synchrotron radiation.

Low-Temperature Rotational Tunneling of Tetrahydroborate Anions in Lithium Benzimidazolate-Borohydride Li(bIm)BH.

To investigate the dynamical properties of the novel hybrid compound, lithium benzimidazolate-borohydride Li(bIm)BH (where bIm denotes a benzimidazolate anion, CNH ), we have used a set of complementary techniques: neutron powder diffraction, ab initio density functional theory calculations, neutron vibrational spectroscopy, nuclear magnetic resonance, neutron spin echo, and quasi-elastic neutron scattering. Our measurements performed over the temperature range from 1.5 to 385 K have revealed the exceptionally fast low-temperature reorientational motion of BH anions.

Solid Aluminum Borohydrides for Prospective Hydrogen Storage.

Metal borohydrides are intensively researched as high-capacity hydrogen storage materials. Aluminum is a cheap, light, and abundant element and Al can serve as a template for reversible dehydrogenation. However, Al(BH ) , containing 16.