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.
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