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~3-Sandwich-Like Complexes Based on the Smallest Polynitrogen Ring

机译:基于最小的多氮环的〜3-三明治状配合物

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摘要

Over the past decades, polynitrogen chemistry has witnessed rapidly growing progress. Unfortunately and to our great surprise, ~3-assembled species based on the simplest polynitrogen ring (N_3) have never been reported. In this paper, we report the first successful assembly design of the long-escaped N3-based compounds, that is, [N_3NiN_3]~(2-), [N_3M(CO)_2N_3]~q ((M,q), ) (Fe,0) (Mn,-1)), [N_3M(CO)_3]~q ((M,q) ) (Co,0), (Fe,-1)), and [N_3MCp]~q ((M,q) ) (Ni, 0), (Co,-1)), at the density functional level. The conversion and dissociation of them need to overcome considerable barriers kinetically. To our surprise, the detailed structural, charge distribution, and orbital analyses consistently reveal a triplet polynitrogen unit, cyclic-~3N_3~-, rather than another simplest trinitrogen unit cyclic-1N3 +. The two unpaired spins within the naked cyclic-~3N_3~- have effectively participated in the bonding interaction with the central transition-metal atoms (here, M is Ni, Fe, Co, and Mn). Moreover, the possible experimental routes of N_3Co(CO)_3 were proposed. The diradical-like polynitrogen ring, cyclic-~3N_3~-, would add to the polynitrogen family as a novel building block. The assembly-designed species await future experimental verification.
机译:在过去的几十年中,多氮化学的发展迅速。不幸的是,令人惊讶的是,从未报道过基于最简单的多氮环(N_3)的〜3组装物种。在本文中,我们报告了首次成功逃脱的基于N3的化合物的组装设计,即[N_3NiN_3]〜(2-),[N_3M(CO)_2N_3]〜q((M,q),) (Fe,0)(Mn,-1)),[N_3M(CO)_3]〜q((M,q))(Co,0),(Fe,-1))和[N_3MCp]〜q( (M,q))(Ni,0),(Co,-1)),在密度函数水平上。它们的转化和离解需要在动力学上克服相当大的障碍。令我们惊讶的是,详细的结构,电荷分布和轨道分析一致地揭示了一个三重态多氮单元环状-〜3N_3〜-,而不是另一个最简单的三氮单元环状1N3 +。裸环〜3N_3〜-中的两个不成对的自旋有效地参与了与中心过渡金属原子(此处的M为Ni,Fe,Co和Mn)的键合相互作用。此外,提出了N_3Co(CO)_3可能的实验路线。类似于双自由基的多氮环(〜3N_3〜-)将作为新的结构单元添加到多氮族中。组装设计的物种有待未来的实验验证。

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