forthcoming articles

A CaCu_1.424Fe_0.576Si₂ phase was obtained during high-pressure sinter­ing of an Si-rich quasicrystal composition prealloy with the nominal chemical com­position Si₆₁Cu₃₀Ca₇Fe₂. The obtained phase crystallizes in the space group I4/mmm (No. 139), with a = b = 4.041 Å and c = 10.010 Å.

Two planar 1,2,3-selena­diazo­les are annulated to a cyclo­octa-1,4-diene with a boat–chair conformation, giving the mol­ecule a butterfly shape.

A novel imidazolium oxalate cocrystal was prepared in which two protons are transferred from oxalic acid to the pyrimidine-type N atoms of two separate imidazole rings. The crystal structure is stabilized by strong N—H⋯O and O—H⋯O hy­dro­gen-bond inter­actions.