Treatment of pyrophoric strontium powder in tetrahydrofuran with ArOH (Ar = C6H2But3-2,4,6) or HNRâ²2 at ambient temperature affords crystalline [Sr(OAr)2(THF)4] or [Sr(NRâ²2)2(THF)2]3, respectively, and 3 with 1,4-dioxane yields crystalline [trans-Sr(NRâ²2)2(µ-1,4-dioxane)}â]4; co-condensation of calcium vapour and RBr in THF at 77 K affords [CaR2(THF)3]5, which with 1,4-dioxane gives [CaR2(1,4-dioxane)2]6; X-ray structures reveal the alkaline earth metal environment to be square-planar for 4[Sr-N 2.449(7), Sr-O 2.533(9)Ã
] but tetrahedral for 6[Ca-C 2.483(5), Ca-O 2.373(4)Ã
] with dioxane as a bridging bidentate 4 or monodentate 6 ligand.
在室温下,使用ArOH(Ar = C6H2But3-2,4,6)或HNR₂₂处理
四氢呋喃中的自燃性
锶粉,分别得到晶体[Sr(OAr)₂(THF)₄]或[Sr(NR₂₂)₂(THF)₂]₃,而与1,4-
二恶烷反应则得到晶体[trans-Sr(NR₂₂)₂(μ-1,4-
二恶烷)}⁴];在77 K下,将
钙蒸气与RBr在THF中共凝聚得到[CaR₂(THF)₃]₅,后者与1,4-
二恶烷反应得到[CaR₂(1,4-
二恶烷)₂]₆;X射线结构分析显示,碱土
金属环境对于₄[Sr-N 2.449(7), Sr-O 2.533(9) Å]为平面正方形,而对于₆[Ca-C 2.483(5), Ca-O 2.373(4) Å]则为四面体,其中
二恶烷作为桥连双齿₄或单齿₆
配体。