Dr. Jan Freudenberg

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Dr. Jan Freudenberg
Organisch-Chemisches Institut
Ruprecht-Karls-Universität Heidelberg
Im Neuenheimer Feld 271
69120 Heidelberg
Contact via Email
Phone: +49 (0) 6221 54 6215
List of Publications
- K.-P. Strunk, M. Bojanowski, C. Huck, M. Bender, L. Veith, M. Tzschoppe, J. Freudenberg, I. Wacker, R. Schroeder, A. Pucci, C. Melzer, U. H. F. Bunz:
"Electron-Beam Irradiation of Cinnamate Films Affords Nanoscale Patterned Substrates for Use in Devices and as Scaffolds in Tissue Engineering".
ACS Appl. Nano Mater. 2020, Accepted Article.
- H. Zhang, E. Kotlear, S. Kushida, S. Maier, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Linear and Star-Shaped Extended Di- and Tristyrylbenzenes: Synthesis, Characterization and Optical Response to Acid and Metal Ions".
Chem. Eur. J. 2020, Accepted Article.
- S. Intorp, M. Hodecker, M. Müller, O. Tverskoy, M. Rosenkranz, E. Dmitrieva, A. Popov, F. Rominger, J. Freudenberg, A. Dreuw, U. H. F. Bunz:
"Quinoidal Azaacenes: 99% Diradical Character".
Angew. Chem. Int. Ed. 2020, Accepted Article.
- D. Burmeister, L.Ahrens, A. Opitz, G. Ligorio, F. Hermerschmidt, D. Jänsch, J. Freudenberg, U. H. F. Bunz, K. Muellen, E. J. W. List-Kratochvil:
"Utilizing Diels-Alder "Click" Chemistry to Functionalize the Organic-Organic Interface of Semiconducting Polymers".
J. Mater. Chem. C 2020, 8, 3302-3307.
Highlighted as Back Cover.
- F. Benneckendorf, V. Rohnacher, E. Sauter, S. Hillebrandt, M. Münch, C. Wang, S. Casalini, K. Ihrig, S. Beck, D. Jänsch, J. Freudenberg, W. Jaegermann, P. Samori, A. Pucci, U. H. F. Bunz, M. Zharnikov, K. Müllen:
"A Tetrapodal Diazatriptycene Enforces Orthogonal Orientation in Self-Assembled Monolayers".
ACS Appl. Mater. Interfaces 2020, 12, 656-6572.
- M. Müller, S. Maier, O. Tverskoy, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Tetrabenzononacene: "Butterfly Wings" Stabilize the Core".
Angew. Chem. Int. Ed. 2020, 59, 1966-1969.
- V. Brosius, M. Müller, J. Borstelmann, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Azaacenodibenzosuberones".
J. Org. Chem. 2020, 85, 296-300.
- L. Ahrens, J. Butscher, V. Brosius, F. Rominger, J. Freudenberg, Y. Vaynzof, U. H. F. Bunz:
"Azaacene Dimers - Novel Acceptor Materials with a ‘Twist’".
Chem. Eur. J. 2020, 26, 799-803.
- H. Reiss, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Peralkynylated Tetraazaacene-Derivatives".
Chem. Eur. J. 2020, 26, 1013-1016.
- G. Xie, M. Hauschild, H. Hoffmann, L. Ahrens, F. Rominger, M. Borkowski, T. Marszalek, J. Freudenberg, M. Kivala, U. H. F. Bunz:
"5,7,12,14-Tetrafunctionalized 6,13-Diazapentacenes".
Chem. Eur. J. 2020, 26, 799-803.
- G. Xie, V. Brosius, J. Han, F. Rominger, A. Dreuw, J. Freudenberg, U. H. F. Bunz:
"Stable Radical Cations of N,N’-Diarylated Dihydrodiazapentacenes".
Chem. Eur. J. 2020, 26, 160-164.
- E. Rüdiger, M. Müller, J. Freudenberg, U. H. F. Bunz:
"Starphenes and Phenes: Structures and Properties".
Organic Materials 2019, 1, 1-18.
- M. Müller, L. Ahrens, V. Brosius, J. Freudenberg, U. H. F. Bunz:
"Unusual Stabilization of Larger Acenes and Heteroacenes".
J. Mater. Chem. C 2019, 7, 14011-14034.
- L. Ahrens, S. Hahn, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"N-Acenoacenes".
Chem. Eur. J. 2019, 25, 14522-14526.
- M. Casutt, M. Ruscello, N. Strobel, S. Koser, U. H.F. Bunz, D. Jänsch, J. Freudenberg, G. Hernandez-Sosa, K. Müllen:
"Diketopyrrolopyrrole-Polymer Meets Thiol-Ene Click Chemistry: A Crosslinked Acceptor for Thermally Stable Near-Infrared Photodetectors".
Chem. Mater. 2019, 31, 7657-7665.
- H. Hoffmann, D. Mukanov, M. Ganschow, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"2,3-Dihalo- and 2,3,6,7-Tetrahaloanthracenes by Vollhardt Trimerization".
J. Org. Chem. 2019, 84, 9826-9834.
- A. Abdulkarim, K.-P. Strunk, R. Bäuerle, S. Beck, H. Makowska, T. Marszalek, A. Pucci, C. Melzer, D. Jänsch, J. Freudenberg, U. H. F. Bunz, K. Müllen:
"Small Change, Big Impact: The Shape of Precursor Polymers Governs Poly-p-phenylene Synthesis".
Macromolecules 2019, 52, 4458-4463.
- H. Zhang, F. Rominger, U. H. F. Bunz, J. Freudenberg:
"Aggregation-Induced Emission of Triphenyl-Substituted Tristyrylbenzenes".
Chem. Eur. J. 2019, 25, 11218-11222.
Highlighted as Cover Feature.
- U. H. F. Bunz, J. Freudenberg:
"N-Heteroacenes and N-Heteroarenes as N-Nanocarbon Segments".
Acc. Chem. Res. 2019, 52, 1575-1587.
- L. Ji, S. Hahn, P. Biegger, H. Reiss, J. Han, A. Friedrich, I. Krummenacher, H. Braunschweig, M. Moos, J. Freudenberg, C. Lambert, A. Dreuw, T. Marder, U. H. F. Bunz:
"Mono- and Dianion of a Bis(benzobuta)tetraazapentacene Derivative".
Chem. Eur. J. 2019, 25, 9840-9845.
- P. Reiser, F. Benneckendorf, M.-M. Barf, L. Müller, R. Bäuerle, S. Hillebrandt, S. Beck, R. Lovrincic, E. Mankel, J. Freudenberg, D. Jänsch, W. Kowalsky, A. Pucci, W. Jaegermann, U. H. F. Bunz, K. Müllen:
"N-Type Doping of Organic Semiconductors: Immobilization via Covalent Anchoring".
Chem. Mater. 2019, 31, 4213-4221.
- K.-P. Strunk, A. Abdulkarim, S. Beck, T. Marszalek, J. Bernhardt, S. Koser, W. Pisula, D. Jänsch, J. Freudenberg, A. Pucci, U. H. F. Bunz, C. Melzer, K. Müllen:
"Pristine Poly(para-phenylene): Relating Semi-Conducting Behavior to Kinetics of Precursor Conversion".
ACS Appl. Mater. Interfaces 2019, 11, 19481-19488.
- M. Müller, S. Koser, O. Tverskoy, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Thiadiazolo-Azaacenes".
Chem. Eur. J. 2019, 25, 6082-6086.
Highlighted as Cover Feature.
- S. Intorp, S. Kushida, E. Dmitrieva, A. Popov, F. Rominger, J. Freudenberg, F. Hinkel, U. H. F. Bunz:
"True Blue Through Oxidation – A Thiaazulenic Heterophenoquinone as Electrochrome".
Chem. Eur. J. 2019, 25, 2723-2728.
Highlighted as Inside Cover Picture.
- M. Casutt, B. Dittmar, H. Makowska, T. Marszalek, S. Kushida, U. H. F. Bunz, J. Freudenberg, D. Jaensch, K. Müllen:
"A Diketopyrrolopyrrole-based Dimer as Blue Pigment".
Chem. Eur. J. 2019, 25, 2723-2728.
- J. Freudenberg, U. H. F. Bunz:
"Perarylation as a Strategy Toward Aggregation-Induced Emitters: Will They Ever Be Stable?"
In: Y. Tang, B.-Z. Tang (Eds.): Principles and Applications of Aggregation-Induced Emitters. Springer, Cham, 2019, 1-25.
- M. Müller, H. Reiss, O. Tverskoy, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Stabilization by Benzannulation: Butterfly-Azaacenes".
Chem. Eur. J. 2018, 24, 12801-12805.
- M. Ganschow, S. Koser, M. Hodecker, F. Rominger, J. Freudenberg, A. Dreuw, U. H. F. Bunz:
"Azaacenes Bearing Five-Membered Rings".
Chem. Eur. J. 2018, 24, 13667-13675.
- F. Benneckendorf, S. Hillebrandt, F. Ullrich, V. Rohnacher, S. Hietzschold, D. Jänsch, J. Freudenberg, S. Beck, E. Mankel, W. Jaegermann, A. Pucci, U. H. F. Bunz, K. Müllen:
"Structure-Property Relationship of Phenylene-Based Self-Assembled-Monolayers for Record Low Work Function of Indium Tin Oxide".
J. Phys. Chem. Lett. 2018, 9, 3731-3737.
- M. Ackermann, J. Freudenberg, D. Jänsch, F. Rominger, U. H. F. Bunz, K. Müllen:
"Palladium-Catalyzed Dimerization of Bis(2-biphenylyl)-acetylene towards Sterically Hindered Acephenanthrylene".
Org. Lett. 2018, 20, 3758-3761.
- L. Ahrens, S. Schlisske, K.-P. Strunk, F. Hinkel, C. Melzer, U. H. F. Bunz, U. Lemmer, G. Hernandez-Sosa, D. Jänsch, J. Freudenberg, K. Müllen:
"Solubility Modulation of Polyfluorene Emitters by Thermally Induced (Retro)-Diels-Alder-Crosslinking of Cyclopentadienyl Substituents".
Chem. Mater. 2018, 30, 4157-4167.
- H. Reiss, L. Ji, J. Han, S. Koser, O. Tverskoy, J. Freudenberg, F. Hinkel, M. Moos, A. Friedrich, I. Krummenacher, C. Lambert, H. Braunschweig, A. Dreuw, T. Marder, U. H. F. Bunz:
"Bromination Improves the Electron Mobility of Tetraazapentacene".
Angew. Chem. Int. Ed. 2018, 57, 9543-9547.
"Tetrabromtetraazapentacen: erhöhte Elektronenbeweglichkeit".
Angew. Chem. 2018, 130, 9688-9692.
- J. Freudenberg, D. Jänsch, F. Hinkel, U. H. F. Bunz:
"Immobilization Strategies for Organic Semiconducting Conjugated Polymers".
Chem. Rev. 2018, 118, 5598-5689.
- G. Xie, S. Hahn, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Synthesis and Characterization of Two Different Azarubrenes".
Chem. Comm. 2018, 54, 448-454.
Highlighted as Inside Front Cover.
- A. Uptmoor, F. Geyer, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Tetrahedral Tetrakis(p-ethynylphenyl)-Group IV-Compounds in Microporous Polymers: Effect of Tetrel on Porosity".
ChemPlusChem 2018, 83, 448-454.
- E. Rüdiger, S. Koser, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Yamamoto Coupling for the Synthesis of Benzophenes and Acene-based Cyclooctatetraenes".
Chem. Eur. J. 2018, 24, 9919-9927.
Featured in Synfacts.
- M. Müller, E. Rüdiger, S. Koser, O. Tverskoy, F. Rominger, F. Hinkel, J. Freudenberg, U. H. F. Bunz:
""Butterfly Wings" Stabilize Heptacene"".
Chem. Eur. J. 2018, 24, 8087-8091.
- A. C. Uptmoor, R. Ilyas, S. M. Elbert, I. Wacker, R. R. Schröder, M. Mastalerz, J. Freudenberg, U. H. F. Bunz:
"Optical Properties and Sequence Information of Tin-Centered Conjugated Microporous Polymers".
Chem. Eur. J. 2018, 24, 1674-1680.
- E. C. Rüdiger, M. Müller, S. Koser, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Dibenzohexacene: Stabilization Through Additional Clar Sextets".
Chem. Eur. J. 2018, 24, 1036-1040.
Highlighted as Inside-Backcover
- N. Jürgensen, A. Kretzschmar, S. Höfle, J. Freudenberg, U. H. F. Bunz, G. Hernandez-Sosa:
"Sulfone-Based Deep Blue TADF Emitters: Solution-Processed OLEDs with High Efficiency and Brightness".
Chem. Mater. 2017, 29, 9154–9161.
- J. Freudenberg, F. Hinkel, D. Jänsch, U. H. F. Bunz:
"Chemical Tongues and Noses Based upon Conjugated Polymers".
Top. Curr. Chem. 2017, (Z) 375, 67.
- M. Ganschow, S. Koser, S. Hahn, F. Rominger, J. Freudenberg, U. H. F. Bunz:
"Dibenzobarrelene-Based Azaacenes: Emitters in Organic Light-Emitting Diodes".
Chem. Eur. J. 2017, 23, 4415-4421.
- A. Abdulkarim, F. Hinkel, D. Jänsch, J. Freudenberg, F. E. Golling, K. Müllen:
"A New Solution to an Old Problem: Synthesis of Unsubstituted Poly(para-phenylene)".
J. Am. Chem. Soc. 2016, 138, 16208-16211.
- S. Stolz, M. Petzoldt, N. Notadiya, T. Rödlmeier, R. Eckstein, J. Freudenberg, U. H. F. Bunz, U. Lemmer, E. Mankel, M. Hamburger, G. Hernandez-Sosa:
"One-step additive crosslinking of conjugated polyelectrolyte interlayers: Improved lifetime and performance of solution-processed OLEDs".
J. Mater. Chem. C 2016, 4, 11150-11156.
- F. Hinkel, J. Freudenberg, U. H. F. Bunz:
"A Stable p-Conjugated Singlet Biradical".
Angew. Chem. Int. Ed. 2016, 55, 9830–9832.
"Ein stabiles p-konjugiertes Singulett-Biradikal".
Angew. Chem. 2016, 128, 9984–9986.
- J. Freudenberg, F. Rominger, U. H. F. Bunz:
"Suppression of Photocyclization: Stabilization of an Aggregation-Induced Tetraaryldistyrylbenzene-Emitter".
Chem. Eur. J. 2016, 22, 8740-8744.
Highlighted as Frontispiece
- A. Uptmoor, J. Freudenberg, S. Schwäbel, F. Paulus, F. Rominger, F. Hinkel, U. H. F. Bunz:
"Reverse Engineering of Conjugated Microporous Polymers: Defect Structures of Tetrakis(4-ethynylphenyl)stannane Networks".
Angew. Chem. Int. Ed. 2015, 54, 14673-14676.
""Sequenzanalyse" konjugierter, mikroporöser Polymere (CMPs): Defektstrukturen eines Tetrakis(4-ethinylphenyl)stannan-Netzwerks".
Angew. Chem. 2015, 127, 14885-14888.
- J. Freudenberg, F. Rominger, U. H. F. Bunz:
"New Aggregation-Induced Emitters: Tetraphenyldistyrylbenzenes".
Chem. Eur. J. 2015, 21, 16749-16753.
Highlighted as Inside Cover and featured in Synfacts
- U. H. F. Bunz, J. Kumpf, J. Freudenberg:
"Distyrylbenzene-aldehydes: identification of proteins in water".
Analyst 2015, 140, 3136-3142.
- J. Freudenberg, A. Uptmoor, F. Rominger, U. H. F. Bunz:
"Photolability of Per-Arylated Butadienes: En Route to Dihydronaphthalenes".
J. Org. Chem. 2014, 79, 11787-11791.
- U. H. F. Bunz, K. Seehafer, F. L. Geyer, M. Bender, I. Braun, E. Smarsly, J. Freudenberg:
"Porous Polymers Based on Aryleneethynylene Building Blocks".
Macromol. Rapid Comm. 2014, 35, 1466-1496.
- J. Kumpf, J. Freudenberg, K. Fletcher, A. Dreuw, U. H. F. Bunz:
"Detection of Amines with Extended Distyrylbenzenes by Strip Assays".
J. Org. Chem. 2014, 79, 6634-6645.
- J. Kumpf, J. Freudenberg, S. T. Schwaebel, U. H. F. Bunz:
"Amine Sensing with Distyrylbenzenes and Their Hexamethylene-Linked Polymers: Spraying Them On".
Macromolecules 2014, 47, 2569-2573.
- J. Freudenberg, J. Kumpf, V. Schäfer, E. Sauter, S. J. Wörner, K. Brödner, A. Dreuw, U. H. F. Bunz:
"Water-Soluble Cruciforms and Distyrylbenzenes: Synthesis, Characterization, and pH-Dependent Amine-Sensing Properties".
J. Org. Chem. 2013, 78, 4949-4959.
List of Invited Lectures
- 27 Mar 2020 - "Kohlenstoff statt Silizium: Grundlagen der organischen Elektronik"
Festvortrag des Heidelberger Life-Science-Lab, Deutsches Krebsforschungszentrum, Heidelberg, Germany
- 05 Nov 2018 - "Novel π-Extended Acenes and Heteroacenes"
π-System Figuration European-Japanese Workshop, Dubrovnik, Croatia
- 14 Nov 2017 - "New AIE-gens and Their Properties"
π-System Figuration Tagung SFB 1249, Heidelberg, Germany
- 27 March 2017 - "Solubility Reduction of Active Materials for Printed Organic Electronics"
European Hengstberger Symposium New Horizons in Smart Materials, Heidelberg, Germany
Reviewer Activities for Scientific Journals
- Chemistry of Materials
- Chemistry - A European Journal
- Advanced Optical Materials
- Journal for Photonics and Energy