Dr. Frank Pammer

Lebenslauf

Ausbildung

Dr.rer.nat. 07/2009

Promotion 'mit Auszeichnung'
Technische Universität Kaiserslautern
Titel der Disseration: "Experimentelle und theoretische Studien zu Eigenschaften des Dibenzo[c,g]fluorenid-Liganden"

Dipl.Chem. 06/2006Diplomarbeit in der Arbeitsgruppe von Prof. Werner R. Thiel
Technische Universität Kaiserslautern

Akademische Laufbahn

seit 12/2012Nachwuchsgruppenleiter
Institut für Organische Chemie II und Neue Materialien II, Universität Ulm
12/2011-11/2012Postdoktorand
Institut für Organische Chemie II und Neue Materialien II, Universität Ulm
11/2009-10/2011Postdoktorand
Gruppe Prof. Frieder Jäkle, Rutgers University Newark, New Jersery, USA
Forschung über konjugierte Polymere und Metallopolymere
08/2006-09/2009Wissenschaftlicher Mitarbeiter
Arbeitsgruppe Prof. Werner R. Thiel, TU Kaiserslautern
Forschung auf dem Gebiet chiraler Metallocene

Auszeichnungen und Preise

2014Thieme Chemistry Journal Award
seit 12/2012Liebig-Stipendiat des Fonds der Chemischen Industrie (VCI)
12/2011-11/2012Feodor-Lynen-Rückstipendiat der Alexander von Humboldt-Stiftung
05/2010-10/2011Feodor-Lynen-Forschungsstipendiat der Alexander von Humboldt-Stiftung
06/2010Preis des Freundeskreises der TU Kaiserslautern für herausragende Forschungsergebnisse im Rahmen der Promotion
08/2007Preis der Kreissparkasse Kaiserslautern für Leistungen im Rahmen der Diplomarbeit im Fach Chemie

Forschungsinteressen

In our group we are in interested in developing new electron deficient oligomers and polymers that may serve as electron transporting (n-type) semiconductors in organic electronic devices. To this end, we pursue different strategies, that include the controlled polycondensation of suitable heteroarenes, and the enhancement of the electron affinity through incorporation of boron centers into conjugated π-systems.

N→B-Ladder Boranes

This project is aimed at the selective introduction of Lewis-acidic tricoordinate boron into the side-chains of conjugated π-systems. Generation of a suitable regiostructure, then allows for the formation intramolecular coordinative N→B-bonds, which strongly affect the molecular geometry and electronic properties of the conjugated systems.
Such N→B-ladder boranes can be very efficiently generated by hydroboration, which allows the facile variation of the substituents on boron.[1-3]

[1]     M. Grandl, B. Rudolf, Y. Sun, D. F. Bechtel, A. J. Pierik, F. Pammer*, „Intramolecular N→B-Coordination as a Stabilizing a Scaffold for π-Conjugated Radical Anions with Tunable Redox Potential”, Organometallics, 2017, in print, DOI: 10.1021/acs.organomet.6b00916.
[2]     M. Grandl, T. Kaese, A. Krautsieder, Y. Sun, F. Pammer*, „Hydroboration as an Efficient Tool for the Preparation of Electronically and Structurally Diverse N→B-Heterocycles”, Chem. Eur. J. 2016, 22, 14373. DOI: 10.1002/chem.201602458.
[3]     M. Grandl, Y. Sun, F. Pammer*, „Generation of an N→B-Ladder-type Structure via Regioselective Hydroboration of an Alkenyl-Functionalized Quaterpyridine”, Chem. Eur. J. 2016, 22, 3976. DOI: 10.1002/chem.201600228.

 

Alternatively, preparation of N→B-ladder boranes via 1,3-dipolar [3+2]-cycloaddition reactions gives access to other N-heterocycles and allows to tailor the electronic properties via variation of substituents in the molecular periphery:[4]

[4]     S. Schraff, Y. Sun, F. Pammer*, „Tuning of Electronic Properties via Labile N→B-Coordination in Conjugated Organoboranes”, J. Mater. Chem. C., 2017, 5, 1730. DOI: 10.1039/C6TC05418H.

 

‘Quasi-Living’ Polycondensation of Electron-deficient Heteroarenes

In recent years, protocols for the quasi-living poly¬con¬den¬sation of arenes via Kumada-, Negishi or Suzuki-cross-coupling reactions, summarized as Catalyst-Transfer Polycon¬densation (CTP), have emer¬ged as the most versatile tools in the synthesis of tailored conjugated polymers.[5]
We demonstrated that highly head-to-tail regio¬regular poly(4-alkyl¬thia¬zoles) (rr-PTzs) can be synthesized via quasi-living Kumada-coupling poly¬con¬den¬sation.[7] rr PTzs are isoelectronic and isostructural to electron-rich poly(3-alkyl¬thiophene)s (rr-P3ATs) and therefore exhibit comparable optical and electro¬chemical band gaps. However, owing to the electron-withdrawing imine-function in the ring, the frontier orbitals levels of rr PTzs are stabilized by ca. 0.3-0.5 eV relative to rr-P3ATs.[6,7] Through systematic variation of the solubilizing side-chains, an rr-PTz-derivative was identified that adopts a highly ordered semi-crystalline structure in the bulk, and consequently exhibits highly improved charge carrier mobilities in designated electron-only devices.[6]


[5]     Z. J. Bryan, A. J. McNeil*, Conjugated Polymer Synthesis via Catalyst-Transfer Polycondensation: Mechanism, Scope, and Applications’, Macromolecules 2013, 46, 8395.
[6]     J. Jäger, N. Tchamba Yimga, M. Urdanpilleta, E. von Hauff*, F. Pammer*, „Towards n-Type Analogues to Poly(3-alkylthiophene)s: Influence of Side-chain Variation on Bulk-morphology and Electron Transport Characteristics of Head-to-tail Regioregular Poly(4-alkylthiazole)s”, J. Mater Chem. C 2016, 4, 2587. DOI: 10.1039/C5TC04251H.
[7]     F. Pammer*, J. Jäger, B. Rudolf, Y. Sun, "Soluble Head-to-Tail Regioregular Polythiazoles: Preparation, Properties and Evidence for Chain-Growth Behavior in the Synthesis via Kumada-Coupling Polycondensation", Macromolecules, 2014, 47, 5904. DOI: 10.1021/ma501213g.
[8]     F. Pammer*, U. Passlack, „Head-to-Tail Regioregular Polythiazole Prepared via Kumada-Coupling Polycondensation”, ACS Macro Lett. 2014, 3, 170. DOI: 10.1021/mz400575u.

Publikationen

ab 2012

S. Schraff, Y. Sun, F. Pammer, "Tuning of Electronic Properties via Labile N→B-Coordination in Conjugated Organoboranes", J. Mater. Chem. C. 2017, 5, 1730-1741.

M. Grandl, B. Rudolf, Y. Sun, D.F. Bechtel, A.J. Pierik, F. Pammer, "Intramolecular N→B-Coordination as a Stabilizing a Scaffold for π-Conjugated Radical Anions with Tunable Redox Potential", Organometallics 2017, in print, DOI: 10.1021/acx.organomet.6b00916.

M.Grandl, T. Kaese, A. Krautsieder, Y. Sun, F. Pammer, "Hydroboration as an Efficient Tool for the Preparation of Electronically and Structurally Diverse N→B-Heterocycles", Chem. Eur. J. 2016, 22, 14373-14382.

J. Jäger, N. Tchamba Yimga, M. Urdanpilleta, E. von Hauff, und F. Pammer, „Toward n-type analogues to poly(3-alkylthiophene)s: Influence of side-chain variation on bulk-morphology and electron transport characteristics of head-to-tail regioregular poly(4-alkylthiazole)s”,  J. Mater. Chem. C, 2016, 4, 2587-2597.

M. Grandl, Y. Sun, F. Pammer, “Generation of an N→B-ladder-type structure via regioselective hydroboration of an alkenyl-functionalized quaterpyridine”, Chem. Eur. J., 2016, 22, 3976-3980.

M. Grandl, F. Pammer, "Preparation of Head-to-Tail Regioregular 6-(1-Alkenyl)-Functionalized Poly(pyridine-2,5-diyl) and its Post-Functionalization via Hydroboration", Macrommol. Chem. Phys. 2015, 216, 2249-2262.
Titelbild: Macrommol. Chem. Phys. 2015, 216, issue 23.

F. Pammer, J. Jäger, B. Rudolf, Y. Sun, "Soluble Head-to-Tail Regioregular Polythiazoles: Preparation, Properties and Evidence for Chain-Growth Behaviour in the Synthesis via Kumada-Coupling Polycondensation", Macromolecules, 2014, 47, 5904-5912.

F. Pammer, U. Passlack, "Head-to-Tail Regioregular Polythiazole Prepared via Kumada-Coupling Polycondensation", ACS Macro Lett. 2014, 3, 170-174.

F. Pammer, W. R. Thiel, „Benzannulated Homologues of Cyclopentadienide as Ligands in Organometallic Chemistry”, Coord. Chem. Rev. 2014, 270-271, 14-30.

F. Guo, X. Yin, F. Pammer, D. Fernandez, R.A. Lalancette, F. Jäkle, "Regioregular Organoborane-Functionalized Poly(3-alkynylthiophene)s", Macromolecules 2014, 47, 7831-7841.

F. Pammer, F. Jäkle, "3-Vinylvorane-Functionalized Oligothiophenes: Isomer-Dependent Electronic Structure and Fluorescence Enhancement Upon Anion Binding", Chem. Sci. 2012, 3, 2598-2606.

F. Pammer, F. Guo, R. A. Lalancette, F. Jäkle, „Synthesis, Structures, and Hydroboration of Oligo- and Poly(3-alkynylthiophene)s“, Macromolecules, 2012, 45, 6333-6343.F. Pammer, F. Jäkle, „3-Vinylborane-Functionalized Oligothiophenes: Isomer-Dependent Electronic Structure and Fluorescence Enhancement Upon Anion Binding“, Chem. Sci. 2012, 3, 2598-2606.

bis einschließlich 2011

F. Pammer, R. A. Lalancette, F. Jäkle, „Metallopolymers Featuring Boratabenzene Iron Complexes“, Chem. Eur. J. 2011, 17, 11280-11289.

F. Pammer, Y. Sun, W. R. Thiel, „Dbf-Ruthenocenes: Towards Chiral Halfsandwich Lewis Acidic Dbf Complexes”, Inorg. Chim. Acta 2011, 374, 205-210.

F. Pammer, Y. Sun, M. Sieger, J. Fiedler, B. Sarkar, W. R. Thiel, „A Cobaltociunium Complex of Dibenzo[c,g]fluorenide and its Structural and Electrochemical Properties”, Organometallics 2010, 29, 6165-6168.

F. Pammer, Y. Sun, D. Weismann, H. Sitzmann, W. R. Thiel, „Exploring the Concept of Aromaticity on Complexes of a Fourfold Benzannulated Cp-Ligand”, Chem. Eur. J. 2010, 16, 1265-1270.

F. Pammer, Y. Sun, M. Pagels, D. Weismann, H. Sitzmann, W. R. Thiel, „Dibenzo¬[c,g]¬fluo-renyl¬eisen: Ein Metallorganischer Verwandter von Pentahelicen”, Angew. Chem. 2008, 120, 3315-3318; „Diben¬zo[c,g]fluorenideiron: A Metallorganic Relative to Penta¬helicene“, Angew. Chem. Int. Ed. 2008, 47, 3271-3274.

F. Pammer, Y. Sun, W. R. Thiel, „Group VI Allyl Complexes of Dibenzo[c,g]fluo¬renide”, Organometallics 2008, 27, 1015-1018.

F. Pammer, Y. Sun, C. May, G. Wolmershäuser, H. Kelm, H.-J. Krüger, W. R. Thiel, „Dibenzo[c,g]fluoren: Die Kombination von Cyclopentadien und 1,1’-Binaphthyl in einem Liganden” Angew. Chem. 2007, 119, 1293-1296; „Dibenzo[c,g]fluorene, the Combination of Cyclo¬¬penta¬diene and 1,1’-Binaphthyl in one Ligand”, Angew. Chem. Int. Ed. 2007, 46, 1270-1273.

Funktion

Nachwuchsgruppenleiter

Kontakt

frank.pammer(at)uni-ulm.de

Institut für Organische Chemie II
und Neue Materialien
Albert-Einstein-Allee 11
Gebäude O26, 4. Niveau
Raum 4402
Telefon: +49 731 50-22855 (Büro)
Telefon: +49 731 50-23896 (Labor)
Telefax: +49 731 50-22840