Two New Structurally Related Strontium Gallium Nitrides: Sr<sub>4</sub>GaN<sub>3</sub>O and Sr<sub>4</sub>GaN<sub>3</sub>(CN<sub>2</sub>)
收藏资源简介：
The strontium gallium oxynitride Sr4GaN3O and nitride−carbodiimide Sr4GaN3(CN2) are reported, synthesized as single crystals from molten sodium at 900 °C. Red Sr4GaN3O crystallizes in space group Pbca (No. 61) with a = 7.4002(1) Å, b = 24.3378(5) Å, c = 7.4038(1) Å, and Z = 8, as determined from single-crystal X-ray diffraction measurements at 150 K. The structure may be viewed as consisting of slabs [Sr4GaN3]2+ containing double layers of isolated [GaN3]6- triangular anions arranged in a “herringbone” fashion, and these slabs are separated by O2- anions. Brown Sr4GaN3(CN2) has a closely related structure in which the oxide anions in the Sr4GaN3O structure are replaced by almost linear carbodiimide [CN2]2- anions [Sr4GaN3(CN2): space group P21/c (No. 14), a = 13.4778(2) Å, b = 7.4140(1) Å, c = 7.4440(1) Å, β = 98.233(1)°, and Z = 4].
