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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Synthesis and thermal decomposition of a pyridylene-bridged bis-β-diketiminate magnesium hydride cluster
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Synthesis and thermal decomposition of a pyridylene-bridged bis-β-diketiminate magnesium hydride cluster

机译：吡啶桥联双-β-二酮化氢化镁簇的合成与热分解

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摘要

Reaction of PYR-(MgnBu)_2, in which PYR is 2,6-[(DIPP)NC(Me)CHC(Me)N-]_2-pyridine and DIPP is 2,6-iPr_2-phenyl, with (DIPP)NH_2BH_3 gave PYR-[MgNH(DIPP)BH3]2 (56%) which was characterized by crystal structure determination. Addition of THF resulted in β-H elimination and formation of PYR-[MgNH(DIPP)-BH_3](MgH)·THF (57%), likewise characterized by crystal structure determination. Conversion of the second amidoborane anion in H~? could not be achieved. Reaction of PYR-(MgnBu)_2 with PhSiH3 gave PYR-(MgH)_2, which crystallized as a dimer. The structure of [PYR-(MgH)_2]_2 shows an 8-membered ring of Mg~(2+) and H~? ions. Thermal decomposition at 130 °C releases one equivalent of H_2, i.e. 50% of the expected value. Nucleophilic attack at the para-position and reduction of the pyridylene bridge might explain reduced H_2 release.
机译：PYR为（2,6-[（DIPP）NC（Me）CHC（Me）N-] _ 2-吡啶和DIPP为2,6-iPr_2-苯基的PYR-（MgnBu）_2与（DIPP）的反应NH_2BH_3得到PYR- [MgNH（DIPP）BH3] 2（56％），通过晶体结构测定来表征。 THF的加入导致β-H的消除并形成PYR- [MgNH（DIPP）-BH_3]（MgH）·THF（57％），同样通过晶体结构测定来表征。第二氨基硼烷阴离子在H〜？中的转化无法实现。 PYR-（MgnBu）_2与PhSiH3的反应生成PYR-（MgH）_2，其结晶为二聚体。 [PYR-（MgH）_2] _2的结构显示Mg〜（2+）和H〜？的8元环。离子。在130°C时热分解释放出一当量的H_2，即预期值的50％。吡啶基桥对位的亲核攻击和还原可能解释了H_2释放减少。

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