The bis-β-diketimine with a meta-phenylene bridge (META-H2: DIPPN(H)CMeCHCMeN–C6H4–NCMeCHCMeN(H)DIPP; DIPP = 2,6-iPr-C6H3) reacted with two equivalents of nBu2Mg to give the bis-β-diketiminate complex META-(MgnBu)2. The latter binuclear magnesium complex was converted to META-[MgNH(iPr)BH3]2 by reaction with H2N(iPr)BH3. The thermal decomposition of this binuclear iPr-substituted magnesium amidoborane complex has been investigated. In benzene it starts to eliminate H2 at 90 °C. Two decomposition products could be obtained by fractional crystallization of the residue. The first product is the trinuclear magnesium complex META-Mg3[iPrNB(H)N(iPr)BH3]2 and the second product is (META-Mg)2. These products have been formed by ligand exchange reactions of the expected complex META-Mg2[iPrNB(H)N(iPr)BH3] and were characterized by single crystal X-ray diffraction. The central Mg2+ ion in META-Mg3[iPrNB(H)N(iPr)BH3]2 is not connected to the ligand system and its coordination geometry could be representative of that in a solid-state magnesium salt containing the RNB(H)N(R)BH32− ion.
具有偏苯桥的双-
β-二酮亚胺(META-H2:DIPPN(H)CMeCHCMeN-
C6H4-NCMeCHCMeN(H)D
IPP;D
IPP = 2,6-iPr-
C6H3)与两个当量的 nBu2Mg 反应,得到双-
β-二酮亚胺络合物 META-(MgnBu)2。后一种双核
镁络合物通过与
H2N(iPr)
BH3 反应转化为 META-[MgNH(iPr) ]2。研究人员对这种双核 iPr 取代的
氨基
硼烷镁络合物的热分解进行了研究。在苯中,它在 90 °C 时开始消除 H2。通过对残留物进行分馏结晶,可以得到两种分解产物。第一个产物是三核
镁络合物 META-Mg3[iPrNB(H)N(iPr) ]2,第二个产物是 (META-Mg)2。这些产物是通过预期络合物 META-Mg2[iPrNB(H)N(iPr) ]的
配体交换反应形成的,并通过单晶 X 射线衍射进行了表征。在 META-Mg3[iPrNB(H)N(iPr) ]2[iPrNB(H)N(iPr) ]中,中心 Mg2+ 离子与
配体系统并不相连,其配位几何形状可能代表了含有 RNB(H)N(R) 2- 离子的固态
镁盐中的配位几何形状。