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The Hohloch Group
Non-classical Carbenes and Macrocyclic Systems

Jun. Prof. Dr. Stephan Hohloch

Jun. Prof. Dr. Stephan Hohloch

Anorganische Chemie - Arbeitskreis Hohloch

Junior Professor

+49 5251 60-5775
NW 2.816

Veröffentlichungen (peer review)


59           S. Hohloch*, M.E. Garner, C.H. Booth, C.A. Gould, D.J. Lussier, L. Maron, J. Arnold “Heavy and Guilty: Isolation of a TMTAA-Based Radical in Uranium bis-TMTAA Complexes” Angew. Chem. Int. Ed., 2018, accepted DOI: 10.1002/anie.201810971

58           M.D. Straub, S. Hohloch, J. Arnold “Homoleptic U(III) and U(IV) amidate complexes” Dalton Trans., 2018, 47, 1772 – 1776.

57           B.F. Parker, S. Hohloch, J.R. Pankhurst, Z. Zhang, J.B. Love, J. Arnold, L. Rao “Interactions of Vanadium(IV) with Amidoxime Ligands: Redox Reactivity” Dalton Trans., 2018, 47, 5695 - 5702.

56           M.A. Boreen, B.F. Parker, S. Hohloch, B.A. Skeel, J. Arnold “f-Block complexes of a m-terphenyl dithiocarboxylate ligand” Dalton Trans., 2018, 47, 96 - 104.

55           M.E. Garner, T.D. Lohrey, S. Hohloch, J. Arnold “Synthesis, characterization, and epoxide ring-opening reactivity of thorium-NHC-bpy complexes“ J. Organomet. Chem., 2018, 857, 10 -15.



54           S. Hohloch, M.E. Garner, B.F. Parker, J. Arnold “New supporting ligands in actinide chemistry: Tetramethyltetraazaannulene complexes with thorium and uranium“ Dalton Trans., 2017, 46, 13768 - 13782.

53           M.E. Garner, B.F. Parker, S. Hohloch, R.G. Bergman, J. Arnold ”Thorium metallacycle facilitates catalytic alkyne hydrophosphination” J. Am. Chem. Soc., 2017, 139, 12935 - 12938.

52           S. Hohloch,# J.R. Pankhurst,# E.E. Jaekel, B.F. Parker, D.J. Lussier, M.E. Garner, C.H. Booth, J.B. Love, J. Arnold “Benzoquinonoid-bridged dinuclear actinide complexes” Dalton Trans., 2017, 46, 11615 - 11625.

51           A.C. Brown, A.B. Altman, T.D. Lohrey, S. Hohloch, J. Arnold “Hydride Oxidation from a Titanium-Aluminum Bimetallic: Thermal, Electrochemical and Insertion Reactivity” Chem. Sci, 2017, 8, 5153 - 5160.

50           D. Schweinfurth, J. Krzystek, M. Antanasov, J. Klein, S. Hohloch, J. Telser, S. Demeshko, F. Meyer, F. Neese, B. Sarkar “Tuning Magnetic Anisotropy Through Ligand Substitution in Five-Coordinate Co(II) Complexes“ Inorg. Chem., 2017, 56, 5253 - 5265.

49           L. Hettmanczyk, S. Spall, S. Klenk, M. van der Meer, S. Hohloch, J. Weinstein, B. Sarkar “Structural, Electrochemical and Photochemical Properties of Mono and Digold(I) Complexes Containing Mesoionic Carbenes“ Eur. J. Inorg. Chem., 2017, 2112 - 2121.

48           M. Rigo, L. Hettmanczyk, F.J.L. Heutz, S. Hohloch, M. Lutz, B. Sarkar, C. Müller “Phosphinines versus Mesoionic Carbenes: A Comparison of Structurally Related Ligands in Au(I)-Catalysis“ Dalton Trans., 2017, 46, 86 - 95.

47           M.G. Sommer, R. Marx, D. Schweinfurth, Y. Rechkemmer, P. Neugebaur, M. van der Meer, S. Hohloch, S. Demeshko, F. Meyer, J. van Slageren, B. Sarkar “Control of Complex Formation through Peripheral Substituents in Click-Tripodal Ligands: Structural Diversity in Homo-and Heteronuclear Cobalt-Azido Complexes“ Inorg. Chem., 2017, 56, 402 - 413.



46           L. Hettmanczyk, B. Schmid, S. Hohloch, B. Sarkar “The Synthesis and Characterization of Novel Palladium(ii) Acetylacetonate Complexes with Mesoionic Carbenes and their Application in the Suzuki–Miyaura Cross Coupling Reaction“ Molecules, 2016, 21, 1561/1 - 13.

45           K.C. Armstrong,# S. Hohloch,# T.D. Lohrey, R.A. Zarkesh, J. Arnold, M.R. Anstey “Control of Clustering Behavior in Anionic Lanthanide(III) Corrole Complexes: From Oligomers to Monomers“ Dalton Trans., 2016, 45, 18653 - 18660.

44           L. Suntrup, S. Hohloch, B. Sarkar “Expanding the Scope of Chelating Triazolylidenes: Mesoionic Carbenes from the 1,5-“Click”-Regioisomer and Catalytic Synthesis of Secondary Amines from Nitroarenes” Chem. Eur. J., 2016, 22, 18009 - 18018. (VIP article, highlighted on the inside front cover)

43           M.G. Sommer, Y. Rechkemmer, L. Suntrup, S. Hohloch, M. van der Meer, J. van Slageren, B. Sarkar “Structural Snapshots in the Copper(II) Induced Azide-Nitrile Cycloaddition: Effect of Peripheral Ligand Substituents on the Formation of Unsupported µ1,1-Azido vs. µ1,4-Tetrazolato Bridged Complexes” Dalton Trans., 2016, 45, 17770 - 17781.

42           M.E. Garner, S. Hohloch, L. Maron, J. Arnold “Thorium-NHC-bpy mediated isocyanide dealkylation: reductive C—N bond cleavage and heterocoupling reactivity“ Angew. Chem. Int. Ed., 2016, 55, 13789 - 13792.

41           M. van der Meer, Y. Rechkemmer, U. Frank, F.D. Breitgoff, S. Hohloch, C.-Y, Su, P. Neugebauer, R. Marx, M. Dörfel, J. van Slageren, B. Sarkar „A Dicobalt Complex with an Unsymmetrical Quinonoid Bridge Isolated in Three Units of Charge: A Combined Structural, (Spectro)electrochemical, Magnetic and Spectroscopic Study“ Chem. Eur. J., 2016, 22, 13884 - 13893.

40           M.E. Garner, S. Hohloch, L. Maron, J. Arnold “A new supporting ligand in actinide chemistry leads to reactive bis(NHC)borate-supported thorium complexes“ Organometallics, 2016, 35, 2915 - 2922.

39           A. Bolje, S. Hohloch, J. Košmrlj, B. Sarkar “RuII, IrIII and OsII mesoionic carbene complexes: efficient catalysts for transfer hydrogenation of selected functionalities” Dalton Trans., 2016, 45, 15983 – 15993.

38           S. Hohloch,# B.M. Kriegel,# R.G. Bergman, J. Arnold “Group 5 chemistry supported by β-diketiminate ligands” Dalton Trans., 2016, 45, 15725 – 15745.

37           S. Hohloch,# L. Suntrup,# B. Sarkar “Exploring Potential Cooperative Effects in Di-Copper-Di-Mesoionic Carbene Complexes” Inorg. Chem. Front., 2016, 3, 67 - 77. (Highlighted on the inside front cover, invited article for the “2015 Emerging Investigators by ICF” issue)

36           A. Verma, R. Maity, M. van der Meer, S. Hohloch, B. Sarkar “PEPPSI Type Complexes Bearing Mesoionic Carbene Ligands: Applications in α-Arylation, α-Methylation and Suzuki-Miyaura Coupling Reactions” Eur. J. Inorg. Chem., 2016, 111 - 117.



35           D. Gupta, V. Singh, S. Hohloch, M. Sathiyendiren, K. Tedin, B. Sarkar ”Utilizing a series of fac-Re(CO)3 core based quinonoid containing complexes for photophysical and cell imaging studies” Polyhedron, 2015, 100, 243 - 250.

34           R. Maity, M. van der Meer, S. Hohloch, B. Sarkar “Di- and Trinuclear Iridium(III) Complexes with Poly-Mesoionic Carbenes Synthesized Through Selective Base-Dependent Metalation” Organometalllics, 2015, 34, 3090 - 3096.

33           L. Hettmanczyk, S. Manck, S. Hohloch, M. van der Meer, B. Sarkar "Heterobimetallic complexes with redox-active mesoionic carbenes as metalloligands: Electrochemical properties and electronic structures" Chem. Commun., 2015, 51, 10949 – 10952.

32           F. Weisser, S. Plebst, S. Hohloch, M. van der Meer, F. Führer, V. Radtke, D. Leichnitz, B. Sarkar “Tuning Ligand Effects and Probing the Inner-Workings of Bond Activation Steps: Generation of Ruthenium Complexes with Tailor-made Properties” Inorg. Chem., 2015, 54, 4621 - 4635.

31           F. Weisser, H. Stevens, J. Klein, M. van der Meer, S. Hohloch, B. Sarkar “Tailoring RuII Pyridine/Triazole Oxygenation Catalysts and Using Photoreactivity to Probe Electronic Properties Chem. Eur. J., 2015, 21, 8926 - 8938.

30           S. Hohloch, F.L. Duecker, M. van der Meer, B. Sarkar “Copper(I) Complexes of Mesoionic Carbene: Structural Characterization and Catalytic Hydrosilylation Reactions“ Molecules, 2015, 20, 7379 - 7395. (Invited article for a special issue on „Advances in Click Chemistry“).

29           A. Bolje, S. Hohloch, M. van der Meer, J. Košmrlj, B. Sarkar “RuII, OsII, and IrIII Complexes with Chelating Pyridyl–Mesoionic Carbene Ligands: Structural Characterization and Applications in Transfer Hydrogenation Catalysis” Chem. Eur. J., 2015, 21, 6756 - 6764 (highlighted on the inside front cover).

28           D. Schweinfurth, M.G. Sommer, M. Atanosov, S. Demeshko, S. Hohloch, F. Meyer, F. Neese, B. Sarkar “The Ligand Field of the Azido Ligand: Insights into Bonding Parameters and Magnetic Anisotropy in a Co(II)-Azido Complex” J. Am. Chem. Soc., 2015, 137, 1993 - 2005.

27           S. Hohloch, S. Kaiser, F.L. Duecker, A. Bolje, R. Maity, J. Košmrlj, B. Sarkar “Catalytic oxygenation of sp3 “C–H” bonds with Ir(III) complexes of chelating triazoles and mesoionic carbenes” Dalton Trans., 2015, 44, 686 - 693. (has been part of Dalton Trans. most read articles)



26           D. Schweinfurth, S. Demeshko, S. Hohloch, M. Steinmetz, J. Brandenburg, S. Dechert, F. Meyer, S. Grimme, B. Sarkar “Spin Crossover in Fe(II) and Co(II) Complexes with the same Click-Derived Tripodal Ligand”  Inorg. Chem., 2014, 53, 8203 - 8212.

25           N. Deibel, S. Hohloch, D. Schweinfurth, F. Weisser, A. Grupp, B. Sarkar “Three-way Cooperativity in d8 Metal Complexes with Ligands Displaying Chemical and Redox Non-Innocence” Chem. Eur. J., 2014, 20, 15178 - 15187.

24           M. van der Meer, Y. Rechkemmer, I. Peremykin, S. Hohloch, J. van Slageren, B. Sarkar “(Electro)catalytic C-C bond formation reaction with a redox-active cobalt complex” Chem. Commun., 2014, 50, 11104 – 11106 (invited article for the special issue “Non-innocent Ligands”, highlighted as back cover).

23           R. Maity, S. Hohloch, M. van der Meer, B. Sarkar “Cyclometallated Mono- and Dinuclear Ir(III) Complexes with „Click" Derived Triazoles and Mesoionic Carbenes” Chem. Eur. J., 2014, 20, 9952 - 9961.

22           N. Deibel, M.G. Sommer, S. Hohloch, J. Schwan, D. Schweinfurth, F. Ehret, B. Sarkar “Dinuclear Quinonoid Bridged d8 Metal Complexes with Redox-Active Azobenzene Stoppers: Electrochemical Properties and Electrochromic Behavior" Organometallics, 2014, 33, 4756 - 4765. (invited article for the special issue „Organometallic Electrochemistry“).

21           S. Hohloch, D. Schweinfurth, M.G. Sommer, F. Weisser, N. Deibel, F. Ehret, B. Sarkar “The redox series [Ru(bpy)2(L)]n, n = +3, +2, +1, 0, with L = bipyridine, “click” derived pyridyl-triazole or bis-triazole: A combined structural, electrochemical, spectro-electrochemical and DFT investigation” Dalton Trans., 2014, 43, 4437 - 4450. (New Talent Europe Themed Issue)

20           D. Schweinfurth, Y. Rechkemmer, S. Hohloch, N. Deibel, I. Peremykin, J. Fiedler, R. Marx, P. Neugebauer, J. van Slageren, B Sarkar “Redox-Induced Spin State Switching and Mixed-Valency in Quinonoid Bridged Dicobalt Complexes” Chem. Eur. J., 2014, 20, 3475 - 3486.

19           S. Hohloch, L. Hettmanczyk, B. Sarkar “Introducing potential hemilability into „click“ triazoles and triazolylidenes: Synthesis and Characterization of d6-metal complexes and oxidations catalysis” Eur. J. Inorg. Chem., 2014, 3164 - 3171. (one of the 20 most accessed articles of Eur. J. Inorg. Chem. between 06/2014 and 07/2015).

18           A. Bolje, S. Hohloch, D. Urankar, A. Pevec, M. Gazvoda, B. Sarkar, J. Košmrlj “Exploring the scope of 1,2,3-triazol-5-ylidene framework that contains chelating pyridyl-donor ligands in bidentate coordination to (p-cymene)ruthenium(II) chloride complexes” Organometallics, 2014, 33, 2588 - 2598.

17           S. Hohloch, N. Deibel, D. Schweinfurth, W. Frey, B. Sarkar “Structural Characterization, Solution Dynamics and Catalytic Properties of Palladium Complexes with Benzimidazolin-2-Ylidene Ligands” Eur. J. Inorg. Chem., 2014, 2131 - 2139.

16           N. Deibel, D. Schweinfurth, S. Hohloch, M. Delor, M. Towrie, I. Sazanovich, J. Weinstein, B. Sarkar “Electrochemistry, Chemical Reactivity, and Time-resolved IR Spectroscopy of Donor-Acceptor Systems [(Qx)Pt(papy)] (Q = substituted o-Quinone or o-Iminoquinone, pap = Phenylazopyridine).” Inorg. Chem., 2014, 53, 1021 - 1031.

15           F. Weisser, S. Hohloch, S. Plebst, D. Schweinfurth, B. Sarkar “Ruthenium Complexes of Tripodal Ligands with Pyridine and Triazole Arms – Subtle Tuning of Thermal, Electro-chemical, and Photochemical Reactivity” Chem. Eur. J., 2014, 20, 781 – 793 (highlighted on the inside front cover).



14        S. Hohloch, L. Suntrup, B. Sarkar “Arene–Ruthenium(II) and −Iridium(III) Complexes with “Click”-Based Pyridyl-triazoles, Bis-triazoles, and Chelating Abnormal Carbenes: Applications in Catalytic Transfer Hydrogenation of Nitrobenzene” Organometallics, 2013, 24, 7376 - 7385.

13        N. Deibel, S. Hohloch, M.G. Sommer, D. Schweinfurth, F. Ehret, P. Braunstein, B. Sarkar “Electrochromic Pt(II) Complexes Derived from Azobenzene and Zwitterionic Quinonoid Ligands: Electronic and Geometric Structures.” Organometallics, 2013, 32, 7366 – 7375.

12        D. Schweinfurth, M.M. Khusniyarov, D. Bubrin, S. Hohloch, C.-Y. Su, B. Sarkar “Tuning Spin-Spin Coupling in Quinonoid-Bridged Dicopper(II) Complexes with Rational Bridge Variation” Inorg. Chem., 2013, 52, 10332 - 10339.

11        J.E.M.N. Klein, M.S. Holzwarth, S. Hohloch, B. Sarkar, B. Plietker “Redox-Active Triazolium-Derived Ligands in Nucleophilic Fe-Catalysis - Reactivity Profile and Develop-ment of a Regioselective O-Allylation” Eur. J. Org. Chem., 2013, 6310 - 6316.

10        S. Hohloch, W. Frey, C.-Y. Su, B. Sarkar “Abnormal Carbenes derived from the 1,5-cycloaddition product between azides and alkynes: structural characterization of Pd(II) complexes and their catalytic properties” Dalton Trans., 2013, 42, 11355 – 11358 (selected as hot article, highlighted on inside front cover)

9          D. Schweinfurth, J. Klein, S. Hohloch, S. Dechert, S. Demeshko, F. Meyer, B. Sarkar, “Influencing the coordination mode of TBTA (TBTA = Tri[(1-benzyl-1H-1,2,3-triazol4-yl)methyl]amine) in dicobalt complexes through changes in metal oxidation states” Dalton Trans., 2013, 42, 6944 - 6952.

8          S. Hohloch, D. Scheiffele, B. Sarkar “Activating Azides and Alkynes for the Click reaction with [Cu(aNHC)2I] or [Cu(aNHC)2]+ (aNHC = triazol-derived abnormal carbenes): Structural characterization and catalytic properties” Eur. J. Inorg. Chem., 2013, 22 – 23, 3956 - 3965. (invited article for a special issue “Small Molecule Activation with Reactive Metal Complexes”)

7          M.G. Sommer, D. Schweinfurth, F. Weisser, S. Hohloch, B. Sarkar “Substituent induced Reactivity in Quinoid bridged dinuclear complexes: Comparison between the Ruthenium and the Osmium systems” Organometallics, 2013, 32, 2069 - 2078.

6          D. Schweinfurth, N. Buettner, S. Hohloch, N. Deibel, J. Klein, B. Sarkar “Hetero-bimetallic Cu-dppf (dppf = 1,1'-Bis(diphenylphosphino)ferrocene) Complexes with "Click" Derived Ligands: A Combined Structural, Electrochemical, Spectroelectrochemical, and Theoretical Study” Organometallics, 2013, 32, 5834 - 5842. (invited article for the special issue „Ferrocene: Beauty and Function“)

5          S. Hohloch, B. Sarkar, L. Nauton, F. Cisnetti, A. Gautier “Are Cu(I)-mesoionic NHC carbenes associated with nitrogen additives the best Cu-carbene catalysts for the azide-alkyne click reaction so far? A case study” Tetrahedron Lett., 2013, 54, 1808 - 1812.



4             S. Hohloch, P. Braunstein, B. Sarkar “Ruthenium Hydride Complexes with Zwitter-ionic Quinonoid Ligands - Isomer Separation, Structural Properties, Electrochemistry, and Catalysis” Eur. J. Inorg. Chem., 2012, 3, 546 - 553. (invited article for a special issue ‘Cooperative and Redox Non-Innocent Ligands)

3             N. Deibel, D. Schweinfurth, S. Hohloch, J. Fiedler, B. Sarkar “Donor-acceptor systems of Pt(II) and electron transfer induced reactivity” Chem. Commun., 2012, 48, 2388 – 2390 (highlighted on the inside front cover).

2             N. Deibel, D. Schweinfurth, S. Hohloch, B. Sarkar “Characterization of [Pd(pap)(NHC)I2]n (n = +1, 0, -1; pap = Phenylazopyridine; NHC = N-Heterocyclic Carbene): Unusual Coordination Mode of pap and Non-innocent Behavior of NHC” Inorg. Chim. Acta, 2012, 380, 269 - 273. (young investigator issue).




1             S. Hohloch, C.-Y. Su, B. Sarkar “Copper(I) complexes of normal and abnormal carbenes and their use as catalysts for the Huisgen [3+2] cycloaddition between azides and alkynes” Eur. J. Inorg. Chem., 2011, 20, 3067 - 3075. (belonged to the most cited papers in 2011 and 2012)


2004-2009Chemistry studies at the University of Stuttgart and ETH Zürich
2008Research visit at ETH Zürich (Prof. Dr. P.H. Seeberger)
2010Diploma thesis at the University of Stuttgart / Institute of Inorganic Chemistry under the guidance of Prof. Dr. B. Sarkar and Prof. Dr. W. Kaim
2010-2014Ph.D. thesis at the University of Stuttgart and the Free University of Berlin under the guidance of Prof. Dr. B. Sarkar
2015-2017Post-Doc at UC Berkeley and Lawrence Berkeley National Lab (LBNL) with Prof. Dr. J. Arnold
seit 2017W1-Juniorprofessor at the University of Paderborn

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