TY  - JOUR
A1  - Diez, Isabel
A1  - Tauer, Klaus
A1  - Schulz, Burkhard
T1  - Unusual polymer dispersions-polypyrrole suspensions made of rings, frames, and platelets
JF  - Colloid and polymer science : official journal of the Kolloid-Gesellschaft
N2  - Experimental results show that the polymerization of pyrrole in the presence of beta-naphthalenesulfonic acid and different fluorosurfactants like perfluorooctanesulfonic acid, perfluorooctyldiethanolamide, and ammonium perfluorooctanoate leads to polypyrrole with special morphologies, such as rings or disks and rectangular frames or plates. The formation of these unusually shaped particles of polymer dispersions is explained by the chemical and colloidal peculiarities of the oxidative pyrrole polymerization with ammonium peroxodisulfate in aqueous medium.
KW  - polypyrrole
KW  - chemical oxidative polymerization
KW  - particle morphology
Y1  - 2006
U6  - https://doi.org/10.1007/s00396-006-1521-8
SN  - 0303-402X
VL  - 284
SP  - 1431
EP  - 1442
PB  - Springer
CY  - New York
ER  - 
TY  - JOUR
A1  - Emmerling, Franziska
A1  - Orgzall, Ingo
A1  - Reck, Günter
A1  - Schulz, Burkhard W.
A1  - Stockhause, Sabine
A1  - Schulz, Burkhard
T1  - Structures of substituted di-aryl-1, 3,4-oxadiazole derivatives: 2,5-bis(pyridyl)- and 2,5-bis(aminophenyl)-substitution
JF  - Journal of molecular structure
N2  - Crystal structures of four different di-aryl-1,3,4-oxadiazole compounds (aryl = 2-pyridyl-, 3-pyridyl-, 2-aminophenyl-, 3-aminophenyl-) are determined. Crystallization of di(2-pyridyl)-1,3,4-oxadiazole yielded monoclinic and triclinic polymorphs. The structures are characterized by the occurrence of pi-pi interactions. Additionally, in case of the aminophenyl compounds intra- as well as intermolecular hydrogen bonds are found that influence the packing motif as well. Since these molecules are often used as ligands in metal-organic complexes similarities and differences of the molecular conformation between the molecules in the pure crystals and that of the ligands in the complexes are discussed. (c) 2006 Elsevier B.V. All rights reserved.
KW  - crystal structure
KW  - 1,3,4-oxadiazole
KW  - molecular conformation
KW  - hydrogen bonds
Y1  - 2006
U6  - https://doi.org/10.1016/j.molstruc.2006.03.076
SN  - 0022-2860
VL  - 800
IS  - 1-3
SP  - 74
EP  - 84
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Hoffmann, Katrin
A1  - Dietzel, Birgit
A1  - Schulz, Burkhard
A1  - Reck, Guenter
A1  - Hoffmann, Angelika
A1  - Orgzall, Ingo
A1  - Resch-Genger, Ute
A1  - Emmerling, Franziska
T1  - Combined structural and fluorescence studies of methyl-substituted 2,5-diphenyl-1,3,4-oxadiazoles - Relation between electronic properties and packing motifs
JF  - Journal of molecular structure
N2  - Prerequisite for the rational design of functional organic materials with tailor-made electronic properties is the knowledge of the structure-property relationship for the specific class of molecules under consideration. This encouraged us to systematically study the influence of the molecular structure and substitution pattern of aromatically substituted 1,3,4-oxadiazoles on the electronic properties and packing motifs of these molecules and on the interplay of these factors. For this purpose, seven diphenyl-oxadiazoles equipped with methyl substituents in the ortho- and meta-position(s) were synthesized and characterized. Absorption and fluorescence spectra in solution served here as tools to monitor substitution-induced changes in the electronic properties of the individual molecules whereas X-ray and optical measurements in the solid state provided information on the interplay of electronic and packing effects. In solution, the spectral position of the absorption maximum, the size of Stokes shift, and the fluorescence quantum yield are considerably affected by ortho-substitution in three or four ortho-positions. This results in blue shifted absorption bands, increased Stokes shifts, and reduced fluorescence quantum yields whereas the spectral position and vibrational structure of the emission bands remain more or less unaffected. In the crystalline state, however, the spectral position and shape of the emission bands display a strong dependence on the molecular structure and/or packing motifs that seem to control the amount of dye-dye-interactions. These observations reveal the limited value of commonly reported absorption and fluorescence measurements in solution for a straightforward comparison of spectroscopic results with single X-ray crystallography. This underlines the importance of solid state spectroscopic studies for a better understanding of the interplay of electronic effects and molecular order.
KW  - Diphenyl-oxadiazoles
KW  - X-ray structure
KW  - Packing motif
KW  - Optical properties
KW  - Fluorescence quantum yield
Y1  - 2011
U6  - https://doi.org/10.1016/j.molstruc.2010.11.071
SN  - 0022-2860
VL  - 988
IS  - 1-3
SP  - 35
EP  - 46
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Turhan, Metehan C.
A1  - Sarac, A. Sezai
A1  - Gencturk, Asli
A1  - Gilsing, Hans-Detlev
A1  - Faltz, Heike
A1  - Schulz, Burkhard
T1  - Electrochemical impedance characterization and potential dependence of poly[3,4-(2,2-dibutylpropylenedioxy)thiophene] nanostructures on single carbon fiber microelectrode
JF  - Synthetic metals : the journal of electronic polymers and electronic molecular materials
N2  - The electropolymerization of 3,4-(2,2-dibutylpropylenedioxy)thiophene (ProDOT-Bu-2) onto single carbon fiber microelectrode (SCFME) was conducted in acetonitrile (ACN) containing sodium perchlorate (NaClO4) as electrolyte and investigated by cyclic voltammetry (CV). The nanostructured films of poly[3,4-(2,2-dibutyl-propyleneclioxy)thiophene] (PProDOT-Bu-2) which were depositing showed complete reversible redox behavior in monomer-free electrolyte solution.
 The capacitive behavior of the films was investigated by electrochemical impedance spectroscopy (EIS) at applied potentials from 0.1 V to 1.3 V. The analysis by equivalent circuit modeling revealed an applied potential around 0.4V to be most suitable for the system PProDOT-Bu-2/SCFME as a double layer supercapacitor component inducing a double layer capacitance C-d, value of 62 mFcm(-2).
KW  - Nanostructure
KW  - Electrochemical impedance spectroscopy
KW  - Conjugated polymeric thin film
KW  - Carbon fiber
Y1  - 2012
U6  - https://doi.org/10.1016/j.synthmet.2012.01.012
SN  - 0379-6779
VL  - 162
IS  - 5-6
SP  - 511
EP  - 515
PB  - Elsevier
CY  - Lausanne
ER  - 
TY  - JOUR
A1  - Emmerling, Franziska
A1  - Orgzall, Ingo
A1  - Dietzel, Birgit
A1  - Schulz, Burkhard
A1  - Larrucea, Julen
T1  - Ordering the amorphous - Structures in PBD LED materials
JF  - Journal of molecular structure
N2  - The class of 2,5 disubstituted-1,3,4-oxadiazoles containing a biphenyl unit on one side is intensively used as electron transport materials to enhance the performance of organic light emitting diodes (OLEDs). In contrast to the ongoing research on these materials insights in their structure-property relationships are still incomplete. To overcome the structural tentativeness and ambiguities the crystal structures of 2-(4-biphenylyl)-5-(4-tert-butylphenyl)-1,3,4-oxadiazole, that of the related compound 2-(4-biphenylyl)-5-phenyl-1,3,4-oxadiazole and of 2-(4-biphenylyl)-5-(2,6-dimethylphenyl)-1,3,4-oxadiazole are determined. A comparison with the results of GAUSSIAN03 calculations and similar compounds in the Cambridge Structural Database leads to a profound characterization.
KW  - OLED
KW  - PBD
KW  - Diphenyl-1,3,4-oxadiazole
KW  - Crystallization
Y1  - 2012
U6  - https://doi.org/10.1016/j.molstruc.2012.04.040
SN  - 0022-2860
VL  - 1030
IS  - 23
SP  - 209
EP  - 215
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Dietzel, Birgit
A1  - Orgzall, Ingo
A1  - Diez, Isabel
A1  - Xu, Chenggang
T1  - Aspects of morphology control during the oxidative synthesis of electrically conducting polymers
N2  - The formation of micro- and nanostructures during the oxidative polymerization of polypyrrole and polyaniline is investigated using different sulfonic acid dopants. Rod- or tube-like structures are found in polypyrrole as well as in polyaniline without addition of further compounds to the initial reaction mixture of monomer, dopant and oxidant. In these cases, always a crystalline precursor complex composed of a dopand molecule and the pure monomer (aniline) or a trimeric moiety (pyrrole) serves as in-situ template. In most cases the surface of the growing polymer is covered by secondary structures with much smaller sizes so that a hierarchical order of structures at different length scales results. Corresponding model considerations for the polymerization process are outlined. Additionally, unusual structures like platelets, frames, rings, or ribbons are observed in the polypyrrole synthesis in the presence of fluorosurfactants.
Y1  - 2009
UR  - http://hip.sagepub.com/
U6  - https://doi.org/10.1177/0954008309339933
SN  - 0954-0083
ER  - 
TY  - JOUR
A1  - Sarac, A. Sezai
A1  - Gencturk, Asli
A1  - Gilsing, Hans-Detlev
A1  - Schulz, Burkhard
A1  - Turhan, C. Metehan
T1  - Effect of electrolyte on the electropolymerization of 2,2-dibutyl-3,4-propylenedioxythiophene on carbon fiber microelectrodes
N2  - Electrocoating of 2,2 dibutylpropylene dioxythiophene on carbon fiber microelectrodes (CFMEs) in different electrolytes in acetonitrile was performed, and surface morphology and electrochemical impedance spectroscopic investigation has been carried out. Impedance spectra showed the typical form of Z(IM) versus Z(RE) for transmission- line at frequencies 10 Hz, with transition to almost pure capacitive behaviour down to 10 mHz (the lower limit of frequency scan).
Y1  - 2009
UR  - http://aspbs.com/jnn/
U6  - https://doi.org/10.1166/Jnn.2009.027
SN  - 1533-4880
ER  - 
TY  - JOUR
A1  - Orgzall, Ingo
A1  - Franco, Olga
A1  - Schulz, Burkhard
T1  - High pressure structural investigations of 2,5-di(4-pyridyl)-1,3,4-oxadiazole - importance of strain studies for the description of intermolecular interactions
N2  - Results of a high pressure x-ray study of 2,5-di(4-pyridyl)-1,3,4-oxadiazole up to 2.5 GPa are presented and discussed. Parameters for the Murnaghan equation of state are derived. The bulk modulus amounts to K-0 = 4.6 +/- 0.3 GPa and its pressure derivative to K-0' = 7.4 +/- 0.6. These values are comparable to values of other diphenyl-1,3,4- oxadiazoles. The anisotropy of the compression is analysed using the strain tensor and discussed based on the anisotropy of the intermolecular interactions
Y1  - 2006
UR  - http://iopscience.iop.org/0953-8984
U6  - https://doi.org/10.1088/0953-8984/18/23/001
ER  - 
TY  - JOUR
A1  - Zhu, Shigen
A1  - Schulz, Burkhard
A1  - Bruma, Maria
A1  - Brehmer, Ludwig
T1  - Comparative study of the thermal properties of related aromatic polyhydrazides and poly(1,3,4-oxadiazole)s
Y1  - 1996
UR  - http://www3.interscience.wiley.com/journal/5401/home?CRETRY=1&SRETRY=0
U6  - https://doi.org/10.1002/(SICI)1099-1581(199612)7:12<879::AID-PAT600>3.0.CO;2-X
SN  - 1042-7147
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Knochenhauer, Gerald
A1  - Brehmer, Ludwig
A1  - Janietz, Silvia
T1  - Stuctures and properties of aromatic poly(1,3,4-oxadiazole)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Mercer, Frank W.
A1  - McKenzie, M.
A1  - Bruma, Maria
A1  - Schulz, Burkhard
T1  - Synthesis and properties of fluorinated polyimides and fluorinated poly(imide-amide)s containing pendent cyano groups
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Stiller, Burkhard
A1  - Zetzsche, Thomas
A1  - Knochenhauer, Gerald
A1  - Dietel, Reinhard
A1  - Brehmer, Ludwig
T1  - Crystal structure of 2,5-Di(4- methoxycarbonyl-phenyl)-1,3,4-oxadiazole characterized by AFM and IR- spectroscopy
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Mercer, Frank W.
A1  - Schulz, Burkhard
A1  - Dietel, Reinhard
A1  - Fitch, J.
A1  - Cassidy, Peter
T1  - Study of crosslinking process in fluorinated poly(imide-amide)s containing pendant cyano groups
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Mercer, Frank W.
A1  - Schulz, Burkhard
A1  - Dietel, Reinhard
A1  - Neumann, Werner
T1  - Fluorinated poly(benzoxazole-imide)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Mercer, Frank W.
A1  - Schulz, Burkhard
A1  - Dietel, Reinhard
A1  - Fitch, J.
A1  - Cassidy, Peter
T1  - Study of crosslinking process in fluorinated poly(imide-amide)s containing pendant cyano groups
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
T1  - Struktur und Eigenschaften dünner Schichten aus aromatischen Poly(1,3,4- oxadiazol)en
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
T1  - New aspects of the solid-state structures and electrochemical properties of aromatic Poly(1,3,4- Oxadiazole)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
T1  - Neue thermostabile Polyheterocyclen
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
T1  - Eine neue Synthesevariante für aromatische Poly(1,3,4-oxadiazole)
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Janietz, Silvia
T1  - Electrochemical studies on thin films of poly(arylene 1,3,4-oxadiazole)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Janietz, Silvia
A1  - Schulz, Burkhard
T1  - Electrochemical studies on thin films of poly(arylene-1,3,4-oxadiazole)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Schulz, Burkhard
A1  - Mercer, Frank W.
T1  - Synthesis and characterization of fluorinated poly(imide-pyridazine- amide)s
Y1  - 1994
ER  - 
TY  - JOUR
A1  - Bauer, J.
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
A1  - Bötcher, M.
A1  - Jagdhold, U.
A1  - Höppner, K.
A1  - Kulesch, A.
A1  - Dietzel, Birgit
T1  - Anwendung von Langmuir-Blodgett-Schichten als Resist für die Niederspannungs-Elektronenstrahl-Lithografie
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Knochenhauer, Gerald
A1  - Brehmer, Ludwig
A1  - Janietz, Silvia
T1  - Stuctures and properties of aromatic poly(1,3,4-oxadiazole)s
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
A1  - Dietzel, Birgit
A1  - Zetzsche, Thomas
T1  - Preparation and characterization of ordered thin films based on aromatic poly(1,3,4-oxadiazole)s
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Sava, Ion
A1  - Schulz, Burkhard
A1  - Zhu, Shigen
A1  - Bruma, Maria
T1  - Synthesis and characterization of new silicon-containing poly(arylene-1,3,4-oxadiazole)s
Y1  - 1995
UR  - http://hip.sagepub.com/
U6  - https://doi.org/10.1088/0954-0083/7/4/011
SN  - 0954-0083
ER  - 
TY  - JOUR
A1  - Okatova, Olga V.
A1  - Lavrenko, Peter N.
A1  - Fedotov, Y. A.
A1  - Schulz, Burkhard
T1  - Polyelectrolyte behavior of some new polyheteroarylene derivatives in sulfuric acid
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Stiller, Burkhard
A1  - Zetzsche, Thomas
A1  - Knochenhauer, Gerald
A1  - Dietel, Reinhard
A1  - Brehmer, Ludwig
T1  - Characterization of 2,5-di(p-tolyl-1,3,4- oxadiazole) crystals by IR-spectroscopy and atomic force microscopy
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Brehmer, Ludwig
A1  - Dietzel, Birgit
A1  - Freydank, Anke-Christine
A1  - Katholy, Stefan
A1  - Knochenhauer, Gerald
A1  - Reiche, Jürgen
A1  - Schulz, Burkhard
A1  - Zetzsche, Thomas
T1  - Langmuir- und Langmuir-Blodgett-Filme amphiphiler Oxadiazole
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Freydank, A.
A1  - Dietzel, Birgit
A1  - Katholy, Stefan
A1  - Knochenhauer, Gerald
A1  - Zetzsche, Thomas
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
T1  - Komplexe Strukturanalytik von Oxadiazol-Mono- und Multischichten
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
A1  - Knochenhauer, Gerald
T1  - Supramolecular structures of aromatic 1,3,4-oxadiazole solids
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
T1  - Structure and properties of thin polyoxadiazole films
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Janietz, Silvia
T1  - Preparation and characterization of thin films containing aromatic poly(1,3,4- oxadiazole)s
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
T1  - Preparation and characterization of ordered thin films based on aromatic poly(1,3,4-oxadiazole)s
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Janietz, Silvia
A1  - Schulz, Burkhard
T1  - Elektrochemische Untersuchungen an aromatischen Poly(1,3,4-oxadiazol)en
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Schulz, Burkhard
A1  - Mercer, Frank W.
T1  - Polyamide copolymers containing hexafluoroisopropylidene groups
Y1  - 1995
ER  - 
TY  - JOUR
A1  - Lavrenko, Peter N.
A1  - Strelina, Irina A.
A1  - Okatova, Olga V.
A1  - Schulz, Burkhard
T1  - Orientation of naphthylene ring in the new poly(naphthylen-1,3,4-oxadiazole)s molecules
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Hamciuc, Corneliu
A1  - Sava, Ion
A1  - Hamciuc, Elena
A1  - Mercer, Frank W.
A1  - Fritzsche, P.
A1  - Schulz, Burkhard
T1  - High temperature polyamides containing pendant imide groups
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Bruma, Maria
A1  - Hamciuc, Corneliu
A1  - Hamciuc, Elena
A1  - Mercer, Frank W.
A1  - Belomoina, Nataliya
A1  - Schulz, Burkhard
T1  - Heterocyclic polyamides containing hexafluoroisopropylidene groups
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Schulz, Burkhard
T1  - Herstellung und Charakterisierung geordneter ultradünner Poly(arylen- 1,3,4-oxadiazol) Schichten
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Okatova, Olga V.
A1  - Andreeva, Katharina A.
A1  - Schulz, Burkhard
T1  - Thermal hydrolytic degradation of polyoxadiazole derivatives
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Janietz, Silvia
A1  - Schulz, Burkhard
T1  - Electrochemical investigation on poly(arylene-1,3,4-oxadiazole)s
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Hamciuc, Corneliu
A1  - Schulz, Burkhard
A1  - Bruma, Maria
T1  - New polyhydrazides and polyoxadiazoles containing pendent phenoxy groups
Y1  - 1996
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Schulz, Burkhard
A1  - Knochenhauer, Gerald
A1  - Dietzel, Birgit
A1  - Freydank, Anke-Christine
A1  - Zetzsche, Thomas
A1  - Brehmer, Ludwig
T1  - Supramolecular structures formed from heterocyclic aromatic molecules
N2  - This paper describes the formation and structure investigation of Langmuir monolayers and Langmuir-Blodgett multilayers formed from amphiphilic derivatives of 2,5-diphenyl-1,3,4-oxadiazole. The 2,5-diphenyl-1,3,4-oxadiazole group as a functional unit with interesting physical and chemical properties is maintained, while the head group, the length of the alkyl chain and the structure of the coupling unit between aromatic and aliphatic part of these linear short-chain amphiphiles is systematically varied in order to explore the influence of this change on the film forming properties and the stability of Langmuir and Langmuir-Blodgett films. Molecular mechanics simulations are shown by these systematic variations to be suitable for the prediction of optimal chemical structures allowing for a stable stratified molecular packing. The combination of a detailed structure investigation of the multilayers based on scanning force microscopy and X-ray data with molecular mechanics simulations yields an insight into the packing of the molecules and the intermolecular interactions.
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Reiche, Jürgen
A1  - Zetzsche, Thomas
A1  - Helms, Andreas
A1  - Freydank, Anke-Christine
A1  - Knochenhauer, Gerald
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
T1  - Organized molecular films of oxadiazole compounds formed by vacuum deposition
Y1  - 1997
ER  - 
TY  - JOUR
A1  - Freydank, Anke-Christine
A1  - Janietz, Silvia
A1  - Schulz, Burkhard
T1  - Synthesis and electrochemical behaviour of Amphiphilic 1,3,4-Oxadiazole derivatives
Y1  - 1998
ER  - 
TY  - JOUR
A1  - Schürmann, H.
A1  - Koch, Norbert
A1  - Imperia, Paolo
A1  - Schrader, Sigurd
A1  - Jandke, M.
A1  - Strohriegl, P.
A1  - Schulz, Burkhard
A1  - Leising, G.
A1  - Brehmer, Ludwig
T1  - Ultraviolet photoelectron spectroscopic study of heterocyclic model compounds for electroluminescent devices
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Giebler, Rainer
A1  - Schulz, Burkhard
A1  - Reiche, Jürgen
A1  - Brehmer, Ludwig
A1  - Wühn, Mario
A1  - Wöll, Christoph
A1  - Smith, Andrew Phillip
A1  - Urquhart, Steven G.
A1  - Ade, Harald W.
A1  - Unger, Wolfgang E. S.
T1  - Near-edge x-ray absorption fine structure spectroscopy on ordered films of an amphiphilic derivate of 2,5- Diphenyl-1,3,4-oxadiazole
N2  - The surfaces of ordered films formed from an amphiphilic derivative of 2,5-diphenyl-1,3,4-oxadiazole by the Langmuir-Blodgett (LB) technique and organic molecular beam deposition (OMBD) were investigated by the use of near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. For the assignment of the spectral features of the C, N, and O K- edge absorption spectra, fingerprint spectra of poly(p-phenylene terephthalamide)(Kevlar), poly(ethylene terephthalate), poly(p-phenylene-1,3,4-oxadiazole), and 2,5-di- (pentadecyl)-1,3,4-oxadiazole, which contain related chemical moieties, were recorded. Ab initio molecular orbital calculations, performed with explicit treatment of the core hole, are used to support the spectral interpretations. Angle-resolved NEXAFS spectroscopy at the C, N, and O K-edges suggests a preferentially upright orientation of the oxadiazole derivative in the outermost layer of the films. X-ray specular reflectivity data and molecular modeling results suggest a similar interpretation.
Y1  - 1999
ER  - 
TY  - JOUR
A1  - Karageorgiev, Peter
A1  - Stiller, Burkhard
A1  - Prescher, Dietrich
A1  - Dietzel, Birgit
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
T1  - Modification of the surface potential of azobenzene-containing langmuir-blodgett films in the near field of a scanning kelvin microscope tip by irradiation
Y1  - 2000
ER  - 
TY  - JOUR
A1  - Kaminorz, Yvette
A1  - Schulz, Burkhard
A1  - Brehmer, Ludwig
T1  - Optical and Electrical Properties of Substituted 2,5-Diphenyl-1,3,4-Oxadiazoles
N2  - New substituted 2,5-diphenyl-1,3,4-oxadiazoles are reported as luminescent materials in light emitting diodes LEDs . The investigated new oxadiazoles show efficient blue and green emission in single layer devices. The combination with a hole transporting and red emitting polythiophene led to a white emission with higher quantum efficiency (QE).
Y1  - 2000
ER  -