S. Haaf, C.M. Henel, F. Kreis, M. Bruttel, E. Kaifer, J. Osterbrink, O. Hübner,  H.-J. Himmel*


Eur. J. Inorg. Chem. 2024, im Druck.


Redox and Coordination Chemistry of Diguanidino-Benzene Ligands with Crown Ether Functions as Secondary Coordination Speres






S. Germer, M. Bauer, O. Hübner, A. Dreuw, H.-J. Himmel*





Chem. Eur. J. 2024, im Druck

Aggregation of N-Heteropolycyclic Aromatic Molecules: The Acridine Dimer and Trimer





J. Osterbrink, F. Dos Santos, E. Kaifer, H.-J. Himmel*







Eur. J. Inorg. Chem. 2024, e202400070 (1 of 11)


Redox Reactivity Control Through Electromerism




H.-J. Himmel








Chapter 7(p. 199 - 248) in Redox-Active Ligands: Concepts and Catalysis, Ed. M. Desage-El Murr, Wiley 2024, ISBN: 978-3-527-34850-3

Redox-Active Guanidine Ligands





L. Gerhards, M. Werr, O. Hübner, Solov'yon, H.-J. Himmel







Inorg. Chem. 2024, 63, 961-975

Peculiar Differences of Two Copper Complexes Containing Similar Redox-Active Ligands: Density functional and Multiconfigurational Calculations






L. Kistner, L.M. Sigmund, F.F. Grieser, J. Krauß, S. Leingang, E. Kaifer, L. Greb, H.-J. Himmel*


Angew. Chem. Int. Ed. 2023, e202317462


Hot Paper


Metal-Free B-B Dehydrocoupling Reaction of a Simple Borane Adduct: Convenient Access to a Nucleophilic Diborane(4)



S. Germer, M. Bauer, O. Hübner, R. Marten, A. Dreuw, H.-J. Himmel


Chem. Eur. J. 2023, e202302296

Isolated Dimers Versus Solid-State Dimers of N-Heteropolycycles: Matrix-Isolation Spectroscopy in Concert with Quantum Chemistry

Toc 2


D. Vogler, M. Schenker, K. H. Ng, E. Kaifer, H.-J. Himmel


Eur. J. Inorg. Chem. 2023, e202300565

On the Coordination Chemistry of Triazolyl-substituted Diborane Ligands, Prepared by 1,3-dipolar Cycloaddition Reactions between Diazido-diboranes and Alkynes

246 Toc



S. Haaf, E. Engels, E. Kaifer, H.-J. Himmel


Chem. Eur. J. 2023, e202301903

Hexaguanidino-Triptycenes and Triphenylenes: Electronic Coupling in Molecules Containing Three Redox-Active o-Diguanidinobenzene Units Connected Either Directly or Interacting Through Homoconjugation


Toc R 246




E. Filbeck, S. Cremer, M.C.F, Jansen, E. Kaifer, H.-J. Himmel*


Chem. Eur. J. 2023, e202302911

Halide-Coupled Double Electron Transfer with Electron-Rich Diboranes





U. Wild, O. Hübner, P. Meiners, E. Kaifer, M. Enders*,  H.-J. Himmel*


Chem. Eur. J. 2023, e202302418


Hot Paper

Intramolecular Through-Space Double-Electron Transfer Between A Pair of Redox-Active Guanidine Units Aligned by Dithiolate Bridges





J. Osterbrink, P. Walter, S. Leingang, H. Pfisterer, E. Kaifer, H.-J. Himmel*


Chem. Eur. J. 2023, e202300514



Quantitastive Electromerism of a Well-defined Mononuclear Copper Complex Through Reversible Intramolecular Metal-Ligand Electron Transfer





L. Kistner, E. Filbeck, P. Ihle, Bučak Gasser, S.W. H. Häussermann, D. Kowatsch, E. Kaifer, H.-J. Himmel*

Eur. J. Org. Chem. 2023, e202300038


Cationic Symmetrically and Unsymmetrically Substituted Diboranes and Bis(diboranes) with Direct Boron-Boron Bond: Synthesis by Substitution, Stability and Properties

242 Toc Grafik




O. Hübner, J. Thusek, H.-J. Himmel*




Angew. Chem.Int. Ed.2023,e202218042


Pyridine Dimers and Their Low-Temperature Isomerization: A High-Resolution Matrix-Isolation Spectroscopy Study  






E. Filbeck, L. Kistner, D. Vogler, D. Bučak Gasser, L. F. Martins, M. Schöner, E. Kaifer, H.-J. Himmel*


Eur. J. Org.Chem.2022, e202201105 (1 - 12)

Invited paper Special collection on Boron Chemistry




Synthesis of Symmetrically and Unsymmetrically Substituted Cationic Diborane(4) Compounds with Distinct Structural Motifs and Properties



L. Lohmeyer, M. Werr, E. Kaifer, H.-J. Himmel*


Chem. Eur. J. 2022,e202201789 (1 - 15)

Interplay and Competition Between Two Different Types of Redox-Active Ligands in Cobalt Complexes: How to Allocate the Electrons? 





D. Vogler, M. Schöner, E. Kaifer, H.-J. Himmel*


Chem. Eur. J. 2022,e202201389 (1 - 7)


Hot Paper


Bistriazoles Connected Through a B-B Bridge, Synthesized by Highly Selective Dipolar Cycloaddition Reactions of a Diazido-diborane(4)




L. Lohmeyer, E. Kaifer, H.-J. Himmel*


Inorg. Chem. 2022, 61, 8440-8454



Solvent Induced Redox Isomerism of Cobalt Complexes with Redox-Active Bisguanidine Ligands





U. Wild, O. Hübner, M. Enders, E. Kaifer, H.-J. Himmel


Eur. J. Org.Chem.2022, e202200349 (1 - 18)

Connecting Organic Redox-Active Building Blocks Through Mild Non-Catalytic C-H Activation






L. Kistner, D. Kowatsch, A. Marz, E. Kaifer,  H.-J. Himmel*


Chem. Eur. J. 2022,e202104016 (1 - 17)

Directed Synthesis and Chemistry of Unsymmetric Dicationic Diboranes and Their Use in Frustrated Lewis Pair-like Chemistry


235 Grafik_toc_graphics




L. Steuer, E. Kaifer,  H.-J. Himmel*


Eur. J. Org.Chem.2022, e202101360 (1 - 15)

Redox-Active Dendrimer-Like Oligoguanidines and Their Use in a Proton-Coupled Electron Transfer Reaction



D. Vogler, L. Haas, N. Wolf, E. Kaifer,  H.-J. Himmel*


Chem. Commun., 2022, 58, 693-696

Derivatization of an especially electron-rich diborane




E. Filbeck, A. Widera,  E. Kaifer, H.-J. Himmel*

Chem. Eur. J. 2021, 27, 15737 -15750 


Polycationic Redox-Active Cyclophanes with  Integrated Electron-Rich Diboron Units

232 Grafik Toc _002_


M. Werr, E. Kaifer, M. Enders, A. Asyuda., M. Zharnikov, H.-J. Himmel*

Angew. Chem.Int. Ed, 2021, 60, 23451-23462


 Hot Paper

A Copper(I) Complex with Two Unpaired Electrons, Synthesised by Oxidation of a Copper(II) Complex with Two Redox-Active Ligands


231 Grafik Toc _002_




O. Hübner, H.-J. Himmel*

Z. Anorg. Allg. Chem. 2021, 647, 1764 - 1777

The Dioxygen Complexes of VO2




Dedicated to Prof. Dr. Hansgeorg Schnöckel on the occasion of his 80th birthday



P. Walter, O. Hübner, E. Kaifer,  H.-J. Himmel*

Chem. Eur. J. 2021, 27, 11943-11956 

Proton-Coupled Electron Transfer (PCET) with 1,4-Bisguanidino-Benzene Derivatives: Comparative Study and Use in Acid-Initiated  C-H Activation



L. Steuer, E. Kaifer, H.-J. Himmel*

Dalton Trans. 2021 509467 - 9482

On the Metal-Ligand Bonding in Dinuclear Complexes with Redox Active Guanidine Ligands



L. Lohmeyer, E. Kaifer, M. Enders,  H.-J. Himmel*

Chem. Eur. J. 2021, 27, 11852-11867

Switching from Metal- to Ligand-Based Oxidation in Cobalt Complexes with Redox-Active Bisguanidine Ligands




S. Schneider, J. M. Gotthardt, L. Steuer, S. Leingang, H.-J. Himmel, J. Zaumseil*; JMater. Chem. C. 2021, 9, 7485 - 7493 

Improving Electron Injection and Transport in Polymer Field-Effect Transistors with Guanidino-Functionalized Aromatic n-Dopants




L. Lohmeyer, F. Schön, E. Kaifer, H.-J. Himmel*, Angew. Chem. 2021, 133, 10506 – 10514; Angew. Chem.Int. Ed, 2021, 60, 10415-10422

Stimulation of Redox-Induced Electron Transfer by Interligand Hydrogen Bonding in a Cobalt Complex with Redox-Active Guanidine Ligand


225 2021


J. Thusek, M. Hoffmann, O. Hübner, S. Germer, H. Hoffmann, J. Freudenberg, U. H. F. Bunz*, A.. Dreuw*, H.-J. Himmel*, Chem. Eur. J. 2021, 27, 2072-2081


Hot Paper


High-Resolution Electronic Excitation and Emission Spectra of Pentacene and 6,13-Diazapentacene Monomers and Weakly Bound Dimers by Matrix-Isolation Spectroscopy



J. Gotthardt, S. Schneider, M. Brohmann, S. Leingang, E. Sauter, M. Zharnikov, H.-J. Himmel, J. Zaumseil*, ACS Appl. Electron. Mater., 2021, 3, 804-812

Molecular n-Doping of Large- and Small-Diameter Carbon Nanotube Field-Effect Transistors with Tetrakis(tetramethylguanidino)benzene




S. Haaf. E. Kaifer, H. Wadepohl, H.-J. Himmel*Chem. Eur. J. 2021, 27, 959-970

Very important paper

Use of Crown Ether Functions as Secondary Coordination Spheres for the Manipulation of Ligand-Metal Intramolecular Electron Transfer in Copper-Guanidine Complexes

220 Sebastian 

221 M. Statz, S. Schneider, F. J. Berger, L. Lai, W. A. Wood, M. Abdi-Jalebi, S. Leingang, H.-J. Himmel, J. Zaumseil*, H. Sirringhaus*, ACS Nano 2020, 14, 15552-15565

Charge and Thermoelectric Transport in Polymer-Sorted Semiconducting Single-Walled Carbon Nanotube Networks

Abbildung Scan


U. Wild, P. Walter, O. Hübner, E. Kaifer, H.-J. Himmel*, Chem. Eur. J. 2020, 26, 16504-16513


Evaluation of the Synthetic Scope and the Reaction Pathways of Proton-Coupled Electron Transfer with Redox-Active Guanidines in C-H Activation Processes



A. Widera, E. Filbeck, H.-J. Himmel, Eur. J. Inorg. Chem. 2020, 3017-3029

Very important paper

Chemistry of Dicationic Diboranes

Grafik Anna 7 20


C. Wagner, F. Kreis, D. Popp, O. Hübner, E. Kaifer, H.-J. Himmel*, Chem. Eur. J. 2020, 26, 10336-10347


1,2,4,5-Tetrakis(tetramethylguanidino)-3,5-diethynyl-benzenes: Fluorescent Probes, Redox-Active Ligands and Strong Organic Electron Donors




O. Hübner, H.-J. Himmel*, Angew. Chem. 2020, 132, 12304-12310Angew. Chem. Int. Ed. 2020, 59, 12206-12212.

Hot Paper 

Oxidative Addition of Dihydrogen to Divanadium in Solid Ne: Multiple-Bonded Triplet HVVH and Singlet V2(μ-H)2




216 M. Werr, E. Kaifer, H.-J. Himmel*, Chem. Eur. J. 2020, 26, 12328-12332

Hetero Diels-Alder Reactions with a Dicationic Urea Azine Derivated Azo Dienophile and Their Use for the Synthesis of an Electron-Rich Pentacene

Marco Toc Entry



F. Schön, L. Greb, E. Kaifer, H.-J. Himmel*,Angew. Chem. 2020, 132, 9212-9218; Angew. Chem. Int. Ed. 2020, 59, 9127-9133


Hot Paper


Desymmetrisation of Dicationic Diboranes by Isomerization Catalysed by a Nucleophile

Florian Toc Bild R


214 L. Lohmeyer, E. Kaifer, H. Wadepohl, H.-J. Himmel*, Chem. Eur. J. 2020, 26, 5834-5845

1,2,5,6-Tetrakisguanidino-naphthalenes: Electron Donors, Fluorescent Probes, and Redox-Active Ligands


2 2020 Toc Alternativ



A. Widera, E. Filbeck, H. Wadepohl, E. Kaifer, H.-J. Himmel*, Chem. Eur. J. 2020, 26, 3435-3440





Electron-Rich, Lewis Acidic Diborane Meets N-Heterocyclic Aromatics: Formation and Electron Transfer in Cyclophane Boranes


1. Bild 2020


212 U. Wild, O. Hübner, H.-J. Himmel*, Chem. Eur. J. 2019, 25, 15988-15992

Redox-active Guanidines in Proton-Coupled Electron Transfer Reactions: Real Alternatives to Benzoquinones?


211 P. Walter, E. Kaifer, H. Herrmann, H. Wadepohl, O. Hübner, H.-J. Himmel*, Eur. J. Inorg. Chem. 2019, 4147-4160

Redox-Active Guanidines with One or Two Guanidino Groups and their Integration in Low-dimensional Perovskite Structures


D. Vogler, N. Wolf, E. Kaifer, H.-J. Himmel*, Dalton Trans. 2019, 48, 14354-14366


Electron Transfer in Complexes of BII Cations with Organic p-acceptors: A Combined Experimental and Quantum-chemical Study