We describe the successful synthesis of the first mixed-cation (pseudoternary) amidoborane, Na[Li(NH₂BH₃)₂], with theoretical hydrogen capacity of 11.1 wt%. Na[Li(NH₂BH₃)₂] crystallizes triclinic (P) with a = 5.0197(4) Å, b = 7.1203(7) Å, c = 8.9198(9) Å, α = 103.003(6)°, β = 102.200(5)°, γ = 103.575(5)°, and V = 289.98(5) ų (Z = 2), as additionally confirmed by Density Functional Theory calculations. Its crystal structure is topologically different from those of its orthorhombic LiNH₂BH₃ and NaNH₂BH₃ constituents, with distinctly different coordination spheres of Li (3 N atoms and 1 hydride anion) and Na (6 hydride anions). Na[Li(NH₂BH₃)₂], which may be viewed as a product of a Lewis acid (LiNH₂BH₃)/Lewis base (NaNH₂BH₃) reaction, is an important candidate for a novel lightweight hydrogen storage material. The title material decomposes at low temperature (with onset at 75 °C, 6.0% mass loss up to 110 °C, and an additional 3.0% up to 200 °C) while evolving hydrogen contaminated with ammonia.

Black AgSO₄, synthesized for the first time by a displacement reaction, differs considerably from anhydrous sulfates of its Group 11 congeners: it has a very small electronic band gap (ca. 0.2 eV) and an anomalously strong one-dimensional antiferromagnetic ordering ( J≈10 meV per Ag), which persists up to the onset of its thermal decomposition at about 120 °C. Ag gray, O red, S yellow.

The thermo-elastic behavior of synthetic single crystals of grossular garnet (Ca₃Al₂Si₃O₁₂) has been studied in situ as a function of pressure and temperature separately. The same data collection protocol has been adopted to collect both the pressure-volume (P-V) and temperature-volume (T-V) data sets to make the measurements consistent with one another. The consistency between the two data sets allows simultaneous fitting to a single pressure-volume-temperature Equation of State (EoS), which was performed with a new fitting utility implemented in the latest version of the program EoSFit7c. The new utility performs fully weighted simultaneous fits of the P-V-T and P-K-T data using a thermal pressure EoS combined with any P-V EoS. Simultaneous refinement of our P-V-T data combined with that of K^T as a function of T allowed us to produce a single P-V-T-K^T equation of state with the following coefficients: $$V_0=1664.46(5){\AA }^3,K_{\mathrm{T}0}=166.57(17)\mathrm{GPa}\text{and}K\prime =4.96(7){\mathrm{\alpha }}_{(300\mathrm{K},1\mathrm{bar})}=2.09(2)\times {10}^{-5}{\mathrm{K}}^{-1}$$ with a refined Einstein temperature (θ_E) of 512 K for a Holland-Powell-type thermal pressure model and a Tait third-order EoS. Additionally, thermodynamic properties of grossular have been calculated for the first time from crystal Helmholtz and Gibbs energies, including the contribution from phonons, using density functional theory within the framework of the quasi-harmonic approximation.

Trifluoromethansulfonate of silver(I), AgSO₃CF₃ (abbreviated AgOTf), extensively used in organic chemistry, and its fluorosulfate homologue, AgSO₃F, have been structurally characterized for the first time. The crystal structures of both homologues differ substantially from each other. AgOTf crystallizes in a hexagonal system (R space group, No.148) with a = b = 5.312(3) Å and c = 32.66(2) Å, while AgSO₃F crystallizes in a monoclinic system in the centrosymmetric P2₁/m space group (No.11) with a = 5.4128(10) Å, b = 8.1739(14) Å, c = 7.5436(17) Å, and β = 94.599(18)°, adopting a unique structure type (100 K data). There are two types of fluorosulfate anions in the structure; in one type the F atom is engaged in chemical bonding to Ag(I) and in the other type the F atom is terminal; accordingly, two resonances are seen in the ¹⁹F NMR spectrum of AgSO₃F. Theoretical analysis of the electronic band structure and electronic density of states, as well as assignment of the mid- and far-infrared absorption and Raman scattering spectra for both compounds, have been performed based on the periodic DFT calculations. AgSO₃F exhibits an unusually low melting temperature of 156 °C and anomalously low value of melting heat (ca. 1 kJ mol⁻¹), which we associate with (i) disorder of its anionic sublattice and (ii) the presence of 2D sheets in the crystal structure, which are weakly bonded with each other via long Ag–O(F) contacts. AgSO₃F decomposes thermally above 250 °C, yielding mostly Ag₂SO₄ and liberating SO₂F₂. AgOTf is much more thermally stable than AgSO₃F; it undergoes two consecutive crystallographic phase transitions at 284 °C and 326 °C followed by melting at 383 °C; its thermal decomposition commences above 400 °C leading at 500 °C to crystalline Ag₂SO₄ and an unidentified phase as major products of decomposition in the solid state.