Low-temperature N2 binding to two-coordinate L2Fe(0) enables reductive trapping of L2FeN2(-) and NH3 generation.

Low-temperature N2 binding to two-coordinate L2Fe(0) enables reductive trapping of L2FeN2(-) and NH3 generation.
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DOI:
10.1002/anie.201409454
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发表时间:
2015-01-07
影响因子:
16.6
通讯作者:
Peters, Jonas C.
Peters, Jonas C.
中科院分区:
化学1区
文献类型:
--
作者:
Ung, Gael;Peters, Jonas C.

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2-配位(CAAC)2Fe络合物[CAAC =环状(烷基)(氨基)卡宾]在低温(T < −80 °C)下结合双氮。由此产生的3-配位N2-络合物(CAAC)2Fe(N2)在低温下被一个电子还原为相应的阴离子[(CAAC)2FeN 2]−捕获。该复合物的结构特征在于,具有可以在β-氮处甲硅烷基化的活化的二氮单元。氧化还原连接的配合物(CAAC)2FeIBArF 24、(CAAC)2Fe 0和[(CAAC)2Fe-IN 2]−在−95 °C下用还原剂(KCl 8)和酸(HBArF 24·2 Et 2 O)处理时,都被发现对将二氮还原为氨具有活性(每个Fe中心最多3.4 ±1.0当量氨)。N2还原活性高度依赖于温度,只有在−78 °C以下才能将N2还原为NH3。这种反应性曲线与N2结合所需的低温和其他不可用的电子转移步骤相匹配,以产生反应性[(CAAC)2FeN 2]−。
The 2-coordinate (CAAC)2Fe complex [CAAC = cyclic (alkyl)(amino)carbene] binds dinitrogen at low temperature (T < −80 °C). The resulting putative 3-coordinate N2-complex, (CAAC)2Fe(N2), was trapped by one electron reduction to its corresponding anion [(CAAC)2FeN2]− at low temperature. This complex was structurally characterized and features an activated dinitrogen unit that can be silylated at the β-nitrogen. The redox linked complexes (CAAC)2FeIBArF24, (CAAC)2Fe0 and [(CAAC)2Fe−IN2]− were all found to be active for the reduction of dinitrogen to ammonia upon treatment with reductant (KC8) and acid (HBArF24·2Et2O) at −95 °C (up to 3.4 ±1.0 equivalent of ammonia per Fe center). The N2 reduction activity is highly temperature dependent, with significant N2 reduction to NH3 only occurring below −78 °C. This reactivity profile tracks with the low temperatures needed for N2 binding and an otherwise unavailable electron transfer step to generate reactive [(CAAC)2FeN2]−.
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