Dr. Jan Freudenberg

Contact

Dr. Jan Freudenberg

InnovationLab
Speyerer Str. 4
69115 Heidelberg


Organisch-Chemisches Institut
Ruprecht-Karls-Universität Heidelberg
Im Neuenheimer Feld 271
69120 Heidelberg

contact via email
Phone: +49 (0) 6221 54 6226

List of Publications

  1. 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, Accepted Article.

  2. 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.

  3. H. Zhang, F. Rominger, U. H. F. Bunz, J. Freudenberg:
    "Aggregation-Induced Emission of Triphenyl-Substituted Tristyrylbenzenes".
    Chem. Eur. J.
    2019, Accepted Article.
    Highlighted as Cover Feature.

  4. U. H. F. Bunz, J. Freudenberg:
    "N-Heteroacenes and N-Heteroarenes as N-Nanocarbon Segments".
    Acc. Chem. Res.
    2019, 52, 1575-1587.

  5. 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, Accepted Article.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. J. Freudenberg, D. Jänsch, F. Hinkel, U. H. F. Bunz:
    "Immobilization Strategies for Organic Semiconducting Conjugated Polymers".
    Chem. Rev. 2018, 118, 5598-5689.

  19. 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.

  20. 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.

  21. 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.

  22. 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.

  23. 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.

  24. 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

  25. 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.

  26. 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.

  27. 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.

  28. 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.

  29. 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.

  30. 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.

  31. 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

  32. 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.

  33. 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

  34. U. H. F. Bunz, J. Kumpf, J. Freudenberg:
    "Distyrylbenzene-aldehydes: identification of proteins in water".
    Analyst 2015, 140, 3136-3142.

  35. 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.

  36. 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.

  37. 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.

  38. 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.

  39. 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

  1. 05 Nov 2018 - "Novel π-Extended Acenes and Heteroacenes"
    π-System Figuration European-Japanese Workshop, Dubrovnik, Croatia

  2. 14 Nov 2017 - "New AIE-gens and Their Properties"
    π-System Figuration Tagung SFB 1249, Heidelberg, Germany

  3. 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