Volume 64, Issue 28 e202424571
Research Article

Electronic Structure Origins of Distinct Hydrogenation Activities Observed for Linear and Bent Bimetallic μ-Nitrides

Mengdi Huang

Mengdi Huang

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P.R. China

University of Chinese Academy of Sciences, Beijing, 100049 P.R. China

These authors contributed equally to this work.

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Luyang Sun

Luyang Sun

State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024 P.R. China

These authors contributed equally to this work.

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Zihe Song

Zihe Song

State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024 P.R. China

These authors contributed equally to this work.

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Haowei Chen

Haowei Chen

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P.R. China

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Dr. Pan Gao

Dr. Pan Gao

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P.R. China

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Prof. Guangjin Hou

Prof. Guangjin Hou

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P.R. China

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Dr. Georgi L. Stoychev

Dr. Georgi L. Stoychev

Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelmplatz 1, D-45470 Mülheim an der Ruhr, Germany

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Prof. Baomin Wang

Prof. Baomin Wang

State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024 P.R. China

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Dr. Dawei Yang

Corresponding Author

Dr. Dawei Yang

State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024 P.R. China

Email: [email protected], [email protected], [email protected]

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Prof. Jingping Qu

Corresponding Author

Prof. Jingping Qu

State Key Laboratory of Fine Chemicals, Frontier Science Center for Smart Materials, Dalian University of Technology, Dalian, 116024 P.R. China

State Key Laboratory of Bioreactor Engineering, Collaborative Innovation Centre for Biomanufacturing, Frontiers Science Center for Materiobiology and Dynamic Chemistry, East China University of Science and Technology, Shanghai, 200237 P.R. China

Email: [email protected], [email protected], [email protected]

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Prof. Shengfa Ye

Corresponding Author

Prof. Shengfa Ye

State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 P.R. China

Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, Guangdong Basic Research Center of Excellence for Functional Molecular Engineering, School of Chemistry, IGCME, Sun Yat-sen University, Guangzhou, 510275 P.R. China

Email: [email protected], [email protected], [email protected]

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First published: 07 May 2025

Graphical Abstract

This work represents the first research that employs a combination of solid-state NMR spectroscopy and DFT calculations to clearly elucidate the contribution of electronic structure to the distinct hydrogenation reactivity of bent and linear bimetallic nitrides.

Abstract

Hydrogenation of metal nitrides is of particular interest due to the direct relevance to Haber–Bosch ammonia synthesis. Notably, for all bi- and multi-nuclear bridging nitrides reported thus far, only those featuring bent M─N─M cores can react with dihydrogen (H2) and related H2-derived species, while the vast majority of linear M─N─M congeners cannot. Herein, we present a detailed electronic-structure study of prototypical bimetallic bent μ-nitrides [Cp*FeIV(μ-SEt)2(μ-N)FeIVCp*][PF6] (1, Cp* = η5-C5Me5) and [Cp*CoIII(μ-SAd)(μ-N)CoIIICp*] (3, Ad = adamantyl) and linear μ-nitride [(TPP)FeIV(μ-N)FeIV(TPP)][PF6] (2, TPP2− = 5,10,15,20-tetraphenylporphinato), as well as μ-imide [Cp*CoIII(μ-SAd)(μ-NH)CoIIICp*][BPh4] (4), using various spectroscopic techniques, in particular, 15N solid-state nuclear magnetic resonance, coupled with density functional theory calculations. An in-depth analysis of their distinct 15N shielding tensors revealed that bent μ-nitrides invariably possess a high-lying proton-accepting molecular orbital (MO) and a low-lying electron-accepting MO. These electronic-structure features are key to the bent μ-nitrides affecting hydrogenolysis via either two-electron oxidation of H2 or H2 heterolysis. However, because of symmetry, linear μ-nitrides lack potent proton-accepting MOs, which rationalizes their disparate hydrogenation activities.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the Supporting Information of this article.

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