25.  Main-group mimics of transition-metal carbonyl redox chemistry

Trends Chem. 2026, DOI: 10.1016/j.trechm.2025.12.002

Juhyeon Shin,ⱡ Seoyeon Lee,ⱡ  Hayoung Song* 

(ⱡ Equally contributed)

Keyword: N-heterocyclic carbene, small molecule activation

24.  Redox-Active Zwitterionic ZCp Ligands for Stable Rh(I)/Ir(I) Complexes and Hyperpolarization Applications

Aust. J. Chem. 2026, DOI: 10.1071/CH25165.

H. Choi, S. Yoo, J. Choi, H. Song, H. J. Jeong, K. Jeong, E. Lee* 

Keyword: ligand design, transition metal complex

23.  N–H Bond Activation of Ammonia using Intramolecular cAAC-borane Lewis Pairs

Inorg. Chem. 2025, 64, 17829.

H. Song, N. K. Szymczak* 

Keyword: N-heterocyclic carbene, small molecule activation, frustrated Lewis pair

22.  Air and Thermally Stable Cyclic (Alkyl)(amino)carbene Ruthenium Complexes for Efficient Ring-Expansion Metathesis Polymerization

J. Am. Chem. Soc. 2025, 143, 2571

M. Jang,ⱡ E. Jung,ⱡ Y. Yang, J. Noh, H. Song, H. Kim, H. Kang, S. Choe, T.-L. Choi,* E. Lee*

Keyword: ligand design, transition metal complex, polymerization, N-heterocyclic carbene

21.  Lewis Acid-Tethered (cAAC)–Copper Complexes: Reactivity for Hydride Transfer and Catalytic CO2 Hydrogenation

Angew. Chem. Int. Ed. 2024, 63, e202411099.

H. Song, N. K. Szymczak* 

Keyword: ligand design, secondary coordination sphere, N-heterocyclic carbene, hydride, transition metal complex

20. Synthesis of sterically congested unsymmetrical 1,2-dicarbonyl radicals through a stepwise approach 

Chem. Commun. 2024, 60, 8043.

Y. Song,ⱡ H. Song,ⱡ Y. Choi, J. Seo* and E. Lee*

(ⱡ Equally contributed)

Keyword: organic radical, N-heterocyclic carbene

19. IZCp and PZCp: Redox Non-innocent Cyclopentadienyl Ligands as Electron Reservoirs for Sandwich Complexes 

Inorg. Chem. 2024, 63, 6427.

(Preprinted in ChemRxiv)

H. Choi, S. H. Yoo, H. Song,* E. Lee* 

Keyword: ligand design, transition metal complex

18. Theoretical analysis on the formation and nitric oxide release of N-heterocyclic carbene nitric oxide radicals

Bull. Korean Chem. Soc. 2024, 45, 404.

J. Park, H. Song, Y. H. Lee, E. Lee* 

Keyword: multiple linear regression, organic radical, N-heterocyclic carbene

17. Formation of Highly Stable 1,2-Dicarbonyl Organic Radicals from Cyclic (Alkyl)(amino)carbenes

Org. Lett. 2023, 25, 4292.

(Preprinted in ChemRxiv)

S. Choe,ⱡ H. Song,ⱡ H. Choi, S. Yoo, J. Kim, Y. H. Ko, E. Lee* 

(ⱡ Equally contributed)

Highlighted in Chemistry Views 

Keyword: organic radical, N-heterocyclic carbene

16. Revisiting the Reaction of IPr with Tritylium: An Alternative Mechanistic Pathway

Chem. Eur. J. 2023, e202203364.

(Preprinted in ChemRxiv)

H. Song, E. Lee* 

Keyword: reaction mechanism, N-heterocyclic carbene 

15. Design strategy for redox-active organic materials derived from N-heterocyclic carbenes

Trends Chem. 2023, 5, 112.

H. Song, E. Lee* 

Keyword: review, battery, N-heterocyclic carbene 

14. Persistent Radicals Derived from N-heterocyclic Carbenes for Material Applications

Acc. Chem. Res. 2022, 55, 2213.

H. Song, E. Pietrasiak, E. Lee* 

Keyword: review, organic radical, N-heterocyclic carbene 

13. Pyrrolinium-substituted Persistent Zwitterionic Ferrocenate Derivative Enabling the Application of Ferrocene Anolyte 

ACS Appl. Mater. Interfaces. 2021, 13, 46558.

(Preprinted in ChemRxiv)

H. Song, G. Kwon, C. Citek, S. Jeon, K. Kang*, E. Lee* 

Keyword: transition metal complex, ligand design, battery

12. Theoretical Assessment of Dinitrogen Fixation on Carbon Atom

Chem. Asian. J. 2021, 16, 2421.

(Preprinted in ChemRxiv)

H. Song, E. Lee* 

Keyword: multiple linear regression, N-heterocyclic carbene, dinitrogen activation

11. Highly Stable 1,2-Dicarbonyl Radical Cations Derived from N-Heterocyclic Carbenes

J. Am. Chem. Soc. 2021, 143, 8527.

(Preprinted in ChemRxiv)

Y. Kim, J. E. Byeon, G. Y. Jeong, S. S. Kim, H. Song, E. Lee* 

Supplementary Journal Cover (Link)

Highlighted in Chemistry Views

Keyword: organic radical, N-heterocyclic carbene 

10. Excited State Proton Transfer of Quinone Cyanine 9: Implications on the Origin of Super-Photoacidity

ChemPhotoChem. 2021, 5, 245 

C. Lee, S. Chung, H. Song, Y. M. Rhee, E. Lee, T. Joo* 

Cover profile: ChemPhotoChem 2021, 5,186.

Keyword: photoacid

9. Indol-2-ylidene (IdY): A New Ambiphilic N-heterocyclic Carbene Derived from Indole

Chem. Eur. J. 2021, 27, 3849.

(Preprinted in ChemRxiv)

H. Kim, M. Kim, H. Song,* E. Lee*  

Keyword: ligand design, N-heterocyclic carbene 

8. Gigantic Porphyrinic Cages

Chem 2020, 6, 3374.

J. Kooⱡ, I. Kimⱡ, Y. Kim, D. Cho, I.-C. Hwang, R. D. Mukhopadhyay, H. Song, A. Dhamija, Y. Ho. Ko, W. Hwang, H. Lee, S. Kim, M.-H. Baik, and K. Kim  

Highlighted in Chemistry World

Keyword: organic cage

7. Dinitrogen activation by penta-pyridyl molybdenum complex

Dalton Trans., 2020, 49, 12945.

J. Cha, H. Kwon, H. Song, E. Lee* 

Keyword: transition metal complex, dinitrogen activation

6. Tunable Redox-active Triazenyl-Carbene Platforms; a New Class of Anolytes for Non-Aqueous Organic Redox Flow Batteries

ACS Appl. Mater. Interfaces, 2020, 12, 37338.

J.Backⱡ, G. Kwonⱡ, J. E. Byeon, H. Song, K. Kang*, and E. Lee* 

Keyword: battery, N-heterocyclic carbene 

5. SuFEx in Metal-Organic Frameworks: a Versatile Post-synthetic Modification Tool

ACS Appl. Mater. Interfaces, 2018, 10, 33785.

S. Parkⱡ, H. Songⱡ, C. Kim, K. Kim*, E. Lee* 

(ⱡ Equally contributed)

Keyword: sulfur fluoride exchange, metal-organic framework

4. Coumaraz‐2‐on‐4‐ylidene: Ambiphilic N‐Heterocyclic Carbenes with a Tunable Electronic Structure

Angew. Chem. Int. Ed. 2018, 57, 8603.

H. Song*, H. Kim, E. Lee* 

Keyword: ligand design, N-heterocyclic carbene 

3. An N-heterocyclic Carbene TCNE Zwitterion: Experimental and Theoretical Study on its Formation and Reactivity

Eur. J. Org. Chem. 2017, 1231.

H. Songⱡ, Y. Kimⱡ, J. Park, Y. H. Ko, K. Kim, E. Lee* 

(ⱡ Equally contributed)

Keyword: reaction mechanism, N-heterocyclic carbene 

2. Activation of Small Molecules at N-Heterocyclic Carbene Centers

Synlett. 2016, 27, 477.

H. Song; Y. Kim; J. Park; K. Kim; E. Lee 

Keyword: review, N-heterocyclic carbene, small molecule activation

1. N-Heterocyclic Carbene Nitric Oxide Radicals

J. Am. Chem. Soc. 2015, 137, 4642.

J. Parkⱡ, H. Songⱡ, Y. Kimⱡ, B. Eun, Y. Kim, D. Y. Bae, S. Park, Y. M. Rhee, W. J. Kim, K. Kim, E. Lee* 

(ⱡ Equally contributed)

Keyword: N-heterocyclic carbene, small molecule activation