Binuclear magnesium amidoborane complexes: characterization of a trinuclear thermal decomposition product.
Binuclear magnesium amidoborane complexes: characterization of a trinuclear thermal decomposition product.
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DOI：
10.1039/c1dt10694e
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发表时间：
2011-08
影响因子：
4
通讯作者：
Jan Spielmann;S. Harder
中科院分区：
文献类型：
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作者：
Jan Spielmann;S. Harder
含间苯基桥联的双β-二酮亚胺(META-H(2)：DIPPN(H)CMeCHCMeN-C(6)H(4)-NCMeCHCMeN(H)DIPP；DIPP=2，6-IPR-C(6)H(3))与两个当量的NBU(2)mg反应，得到双-β-二酮亚胺配合物Meta-(MGNBu)(2)。后者与H(2)N(IPR)BH(3)反应生成间位[MgNH(IPR)BH(3)](2)。研究了该双核IPR取代的胺硼镁络合物的热分解过程。在苯中，H(2)在90℃时开始消除，残渣经分离结晶得到两种分解产物。第一个产物是三核镁配合物偏镁(3)[iPrNb(H)N(Ipr)BH(3)](2)，第二个产物是(偏镁)(2)。这些产物是通过配体交换反应生成的，并用单晶X-射线衍射法进行了表征。偏镁(3)[iPrNb(H)N(IPR)BH(3)](2)中的中心镁离子不与配位体系相连，其配位构型可代表含RNb(H)N(R)BH(3)(2-)的固态镁盐的配位构型。
The bis-β-diketimine with a meta-phenylene bridge (META-H(2): DIPPN(H)CMeCHCMeN-C(6)H(4)-NCMeCHCMeN(H)DIPP; DIPP = 2,6-iPr-C(6)H(3)) reacted with two equivalents of nBu(2)Mg to give the bis-β-diketiminate complex META-(MgnBu)(2). The latter binuclear magnesium complex was converted to META-[MgNH(iPr)BH(3)](2) by reaction with H(2)N(iPr)BH(3). The thermal decomposition of this binuclear iPr-substituted magnesium amidoborane complex has been investigated. In benzene it starts to eliminate H(2) at 90 °C. Two decomposition products could be obtained by fractional crystallization of the residue. The first product is the trinuclear magnesium complex META-Mg(3)[iPrNB(H)N(iPr)BH(3)](2) and the second product is (META-Mg)(2). These products have been formed by ligand exchange reactions of the expected complex META-Mg(2)[iPrNB(H)N(iPr)BH(3)] and were characterized by single crystal X-ray diffraction. The central Mg(2+) ion in META-Mg(3)[iPrNB(H)N(iPr)BH(3)](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)BH(3)(2-) ion.