邻苯二硫酚桥联双核双氮过渡金属配合物N-N键活化规律的理论研究

doi:10.6023/A15120781

化学学报 ›› 2016, Vol. 74 ›› Issue (4): 340-350.DOI: 10.6023/A15120781 上一篇下一篇

研究论文

邻苯二硫酚桥联双核双氮过渡金属配合物N-N键活化规律的理论研究

张益伟, 马雪璐, 张欣, 雷鸣

北京化工大学理学院化工资源有效利用国家重点实验室北京 100029

投稿日期:2015-12-16 发布日期:2016-03-22
通讯作者: 张欣, 雷鸣 E-mail:zhangxin@mail.buct.edu.cn;leim@mail.buct.edu.cn
基金资助:
项目受国家自然科学基金(No. 21373023)、北京化工大学学科建设项目基金(No. XK1527)资助项目以及"NSFC-广东联合基金(第二期)超级计算科学应用研究专项资助和国家超级计算广州中心支持"资助.

Theoretical Study on N-N Activation by Thiolate-bridged Dinuclear Dinitrogen Transition-metal Complexes

Zhang Yiwe, Ma Xuelu, Zhang Xin, Lei Ming

State Key Laboratory of Chemical Resource Engineering, College of Science, Beijing University of Chemical Technology, Beijing 100029, China

Received:2015-12-16 Published:2016-03-22
Supported by:
Project supported by the National Natural Science Foundation of China (No. 21373023), BUCT Fund for Disciplines Construction and Development (No. XK1527) and Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase).

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摘要/Abstract

采用密度泛函理论方法研究了具有仿生固氮结构的两类化合物[Cp*Fe(μ-η²:η²-bdt)(μ-η¹:η¹-MeN＝NMe)FeCp*]以及[Cp*Fe(μ-SEt)₂(μ-η¹:η¹-MeN＝NMe)FeCp*]的90种不同结构, 调变过渡金属中心, 研究不同自旋态下(单重态和三重态)具有side-on或end-on配位键型的双核双氮过渡金属配合物, 基于计算结果分析了BDT(邻苯二硫酚)和乙基类型配体的不同过渡金属配合物活化双氮的程度. 研究结果表明, N-N键活化程度与配合物过渡金属中心所在周期存在密切关系, 更高周期对双氮的活化程度更高, 同周期金属过渡金属配合物对N-N键的活化程度从第四副族至第八族呈现折线型下降, 同时, 过渡金属中心的外层价电子数的奇偶性对双氮的活化程度具有一定影响. 此外, side-on键型对双氮的活化程度要高于end-on键型, 具有不同基团的同种骨架配体对N-N键的活化能力没有明显区别.

关键词: 过渡金属配合物, N-N键活化, 金属调变, 邻苯二硫酚桥联配体, 配位键型

90 kinds of dinitrogen binuclear transition-metal complexes at singlet and triplet states in Group 4~10 from Period 4 to 6 based on the biomimetic dinitrogen fixation species were studied using DFT method, [Cp*Fe(μ-η²:η²-bdt)- (μ-η¹:η¹-MeN＝NMe)FeCp*] and [Cp*Fe(μ-SEt)₂(μ-η¹:η¹-MeN＝NMe)FeCp*], in order to investigate the transition-metal effect in N-N activation. The calculated results indicate that N-N bond activation is strongly related to the period of transition metal. N-N activation by transition metals in Period 6 is stronger than those in Period 5 and Period 4. For transition metals in the same period, N-N activation ability decreases from Group 4 to Group 10. The odd-even electron number of transition metal center also shows certain influence on the N-N activation. In addition, side-on coordination mode is more favorable than end-on mode for thiolate-bridged dinuclear transition-metal complexes on N-N bond activation. The type of ligands (BDT ligand or ethyl ligand) in this system has little impact on N-N activation.

Key words: transition-metal complexes, N-N activation, metal effect, thiolate-bridged ligand, coordination modes

引用此文

张益伟, 马雪璐, 张欣, 雷鸣. 邻苯二硫酚桥联双核双氮过渡金属配合物N-N键活化规律的理论研究[J]. 化学学报, 2016, 74(4): 340-350.

Zhang Yiwe, Ma Xuelu, Zhang Xin, Lei Ming. Theoretical Study on N-N Activation by Thiolate-bridged Dinuclear Dinitrogen Transition-metal Complexes[J]. Acta Chim. Sinica, 2016, 74(4): 340-350.

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邻苯二硫酚桥联双核双氮过渡金属配合物N-N键活化规律的理论研究

Theoretical Study on N-N Activation by Thiolate-bridged Dinuclear Dinitrogen Transition-metal Complexes

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