BPE D. Brete D. Pryzembel C. Eickhoff R. Carley W. Freyer K. Reuter C. Gahl M. Weinelt

Mixed self-assembled monolayers of azobenzene photoswitches with trifluoromethyl and cyano end-groups

Journal of Physics-Condensed Matter (in press)


GSB10 C. Gahl R. Schmidt D. Brete E. McNellis W. Freyer R. Carley K. Reuter M. Weinelt

Structure and excitonic coupling in self-assembled monolayers of azobenzene-functionalized alkanethiol

Journal of American Chemical Society 132 (2010) 1831-1838
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Henk Fidder, Alexandra Lauer, Wolfgang Freyer, Benjamin Koeppe, and Karsten Heyne

Photochemistry of Anthracene-9,10-endoperoxide

Phys. Chem. A 113 (2009) 6289-6296

Wolfgang Freyer, Daniel Brete, Roland Schmidt, Cornelius Gahl, Robert Carley, MartinWeinelt

Switching behavior and optical absorbance of azobenzene-functionalized alkanethiols in different environments

Journal of Photochemistry and Photobiology A: Chemistry 204 (2009) 102-109

R. Schmidt, E. McNellis, W. Freyer, D. Brete, T. Gießel, C. Gahl, K. Reuter, M. Weinelt

Azobenzene-functionalized alkanethiols in self-assembled monolayers on gold

Appl. Phys. A 93 (2008) 267-275

Wolfgang Freyer; Catalin C Neacsu, Markus B Raschke

Absorption, luminescence, and Raman spectroscopic properties of thin films of benzo-annelated metal-free porphyrazines

Journal of Luminescence 128 (2008) 661-672

Ines Corral, Leticia Gonza´lez, Alexandra Lauer, Wolfgang Freyer, Henk Fidder, Karsten Heyne

Identifying the low-lying electronic states of anthracene-9,10-endoperoxide

Chem. Phys. Lett. 452 (2008) 67-71

Pancho Tzankov, Oliver Steinkeller, Jiaan Zheng, Mark Mero, Wolfgang Freyer, Anton Husakou, Ihar Babushkin, Joachim Herrmann, and Frank Noack

High-power fifth-harmonic generation of femtosecond pulses in the vacuum ultraviolet using a Ti:sapphire laser

Opt. Express 15 (2007) 6389-6395

F. Schuettauf, C. Haritoglou, C.A. May, R. Rejdak, A Mankowska, W. Freyer, K. Eibl, E. Zrenner, A. Kampik, and S. Thaler

Adminstration of novel dyes for intraocular surgery: An in-vivo toxicity animal study

Invest. Opthamol. Vis. Sci. 47 (2006) 3573-3578

C. Haritoglou, R.Tadyoni, C.A. May, C.A. Gass, A. Carolin, W. Freyer, S.G. Priglinger, and A.Kampik

Short-term in-vivo evaluation of novel dyes for intraocular surgery

Retina 26 (2006) 673-678

C. Haritoglou, W. Freyer, S.G. Priglinger, A. Kampik

Light absorbing properties in indocyanine green(ICG) in solution and after adsorption to the retinal surface - an ex-vivo approach

Graefe´s Arch. Clin. Exp. Ophthalmol 244 (2006) 1196-1202

C. Haritoglou, A.Yu, W. Freyer, G. Priglinger, C. Alge, K. Eibl, C.A. May, U. Welge-Luessen, A. Kampik

An evaluation of novel vital dyes for intraocular surgery

Invest. Ophthalmol. Vis. Sci. 46 (2005) 3315-3322

D. Pop, B. Winter, W. Freyer, W. Widdra, I. V. Hertel

Photoelectron spectroscopy on thin films of extended zinc porphyrazines

J. Phys. Chem. B 109 (2005) 7826-7833

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W. Freyer, S. Müller, K. Teuchner

Photophysical properties of benzoannelated metal-free phthalocyanines

J. Photochem. Photobiol. A: Chemistry 163 (2004) 231-240

Download PDF/PS-File: A1-P-2002.06

D. Pop, B. Winter, W. Freyer, R. Weber, W. Widdra, I.V. Hertel

Photoelectron spectroscopy on thin films of extended copper porphyrazines

J. Phys. Chem. B 108 (2004) 9158-9167

Download PDF/PS-File: A1-P-2003.16

D. Pop, B. Winter, W. Freyer, I.V. Hertel, W. Widdra

Electronic structure of metal-free porphyrazine in thin films

J. Phys. Chem. B 107 (2003) 11643-11647

Download PDF/PS-File: A1-P-2003.02

K. Teuchner, S. Müller, W. Freyer, D. Leupold, P. Altmeyer, M. Stuecker, K. Hoffmann

Femtosecond two-photon excited fluorescence of melanin

SPIE Proc. 4797 (2003) 211-219

Download PDF/PS-File: A1-P-2002.06

W. Freyer, H. Stiel, D. Leupold

A photoreversible porphyrazine as model compound for optical data storage

J. Inform. Rec. 25 (2000) 95-104

K. Teuchner, J. Ehlert, W. Freyer, D. Leupold, P. Altmeyer, M. Stücker, K. Hoffmann

Fluorescence studies of melanin by stepwise two-photon femtosecond laser excitation

J. Fluorescence 10 (2000) 275-281

Download PDF/PS-File: C1-P-1999.12

K. Teuchner, W. Freyer, D. Leupold, A. Volkmer, D.J.S. Birch, P. Altmeyer, M. Stücker, K. Hoffmann

Femtosecond two-photon excited fluorescence of Melanin

Photochem. Photobiol. 70 (1999) 146-151

W. Freyer, H. Stiel, M. Hild, K. Teuchner, D. Leupold

One- and two-photon induced photochemistry of modified palladiumporphyrazines involving molecular oxygen

Photochem. Photobiol. 66 (1998) 596-604

W. Freyer, M. Hild, H. Stiel, D. Leupold

The cycloreversion of a substituted palladium phthalocyanine containing epidioxybridges

J. Inf. Rec. 24 (1998) 95-100

W. Freyer, D. Leupold

A multiphotochromic tetraanthraporphyrazine based on the involvement of molecular singlet oxygen

J. Photochem. Photobiol. A: Chemistry 105 (1997) 153-158

W. Freyer, L.Q. Minh

Interaction of acenannulated metallotetraazaporphyrins with the Lewis acid aluminium bromide

J. of Porphyrins and Phthalocyanines 1 (1997) 287-295

H. Stiel, W. Freyer, A. Paul, K. Teuchner, D. Leupold,

Novel start mechanisms using novel sensitizers for photodynamic laser tumor therapy

Laser in Medicine, Springer (1996) 61-64

W. Freyer, S. Flatau

The first annulated porphyrazine containing four endoperoxide bridges

Tetrahedron Lett. 37 (1996) 5083-5086

W. Freyer, D. Leupold

Photochromism of long wavelength absorbing tetraanthraporphyrazines involving higher excited electronic states

Proc. 14th Conference Photochemistry Section of the Society of German Chemists 1995 Pt 2; J. Inform. Rec. 23 (1996) 167-169

W. Werncke, M. Pfeiffer, T. Johr, A. Lau, S. Woggon, S. Schrader, H.-J. Juepner, W. Freyer

Determination of c(3)-parameters of solutions and of thin layers by coherent anti-stokes Raman scattering (CARS)

Mol. Cryst. Liquid Cryst. Sci. Technol. Sect. B: Nonlinear Opt.10 (1995) 173-181

H. Stiel, W. Freyer, A. Paul, K. Teuchner, D. Leupold

New launch mechanisms with new sensitizers for photodynamic laser tumor therapy of tumors

Proc. Laser Medizin Vortr. 10. Tag. Dtsch. Ges. Lasermed. 12. Int. Kongr., Springer (1996) 61-64

W. Freyer, D. Leupold

Towards PDT sensitizers with internal sources of singlet oxygen

J. Photochem. Photobiol. B: Biology 30 (1994) 77-78

W. Werncke, M. Pfeiffer, T. Johr, A. Lau, W. Freyer

Photoisomerization studies of cyanine dyes by time resolved resonance CARS

Time-Resolved Vibrational Spectroscopy IV 74 (1994) 100-103

H. Stiel, K. Teuchner, A. Paul, W. Freyer, D. Leupold

Two-photon excitation of alkyl substituted magnesium phthalocyanine: Radical formation via higher excited states

J. Photochem. Photobiol. A: Chemistry 80 (1994) 289-298

H. Stiel, A. Paul, W. Freyer, K. Teuchner, D. Leupold

Two-photon photochemistry of substituted porphyrazines

Photochem. Photobiol. 59 (1994) 34S

D. Leupold, W. Freyer, H. Stiel

Laser aided molecular engineering for photodynamic therapie

Biomed. Techn. 39 (1994) 383-384

W. Freyer

Octa-(4-tert-butylphenyl)-tetrapyrazinoporphyrazine and its metal complexes

Prakt. Chem./ Chem. Ztg. 336 (1994) 690-692

W. Freyer, H. Stiel, K. Teuchner, D. Leupold

Photophysics and photochemistry of tetraanthraporphyrazines, attempts to obtain a new generation of photosensitizers

J. Photochem. Photobiol. A: Chemistry 80 (1994) 161-167

W. Freyer

Metallo-tetrabenzo[g]quinoxalino-2,3-porphyrazines

J. Prakt. Chem. 336 (1994) 693-694

W. Werncke, M. Pfeiffer, T. Johr, A. Lau, W. Freyer

Photoisomerisation studies of cyanine dyes by time-resolved vibrational spectroscop

Proc. VIth. International Conference on Time-resolved Vibrational Spectroscopy (1993) 1-4

W. Werncke, M. Pfeiffer, T. Johr, A. Lau, W. Freyer

Photoisomerisation studies of cyanine dyes by time-resolved resonance CARS

Proc.VIth. International Conference on Time-resolved Vibrational Spectroscopy (1993)

K. Teuchner, A. Pfarrherr, H. Stiel, W. Freyer, D. Leupold

Spectroscopic properties of potential sensitizers for new PDT start mechanisms via two step excited electronic states

Photochem. Photobiol. 57 (1993) 465-471

D. Leupold, W. Freyer, H. Stiel

Higher excited sensitizer states in photodynamic therapy. Reply to a comment by T. Vidoczy.

J. Photochem. Photobiol. B: Biology 17 (1993) 83-86

H. Stiel, K. Teuchner, W. Freyer, D. Leupold

Possible mechanisms of laser photosensitization via higher excited states in phthalocyanines

Proc. 11. International Congress on Photobiology (1992) 300

M. Pfeiffer, W. Werncke, A. Lau, W. Freyer

Correlation of electronic properties and Raman spectra within a series of polymethine dyes

Electronic properties of Polymers, Springer Ser. Solid-State Sci. 107 (1992) 150-156

D. Leupold, W. Freyer

Proposal of modified mechanisms for photodynamic therapy

J. Photochem. Photobiol. B: Biology 12 (1992) 311-314

D. Leupold, W. Freyer, A. Pfarrherr, K. Teuchner, H. Stiel

Attempts to avoid cutaneous phototoxicity in photodynamic therapy

Proc. 4. Congress of European Society for Photobiology (1991) 73

B. Röder, D. Näther, T. Lewald, M. Braune, C. Nowak, W. Freyer

Biophysical properties and photodynamic activity in vio of some tetrapyrroles

Biophys. Chem. 35 (1990) 303-312

W. Freyer, F. Fink, H. Poleschner, E. Fanghänel

Activation of electronically excited nickel dithiolenes

Z. Chem. 29 (1989) 149-150

W. Freyer, F. Fink

A saturable absorber for the near IR-region based on polymethine dye aggregates

Z. Chem. 29 (1989) 105-106

W. Freyer, F. Pragst.

Absorption spectra of p-cation radicals of easily soluble metallotetraazaporphins

Z. Chem. 29 (1989) 23-24

W. Freyer, K. Teuchner, J. Fabian

Pyrazolone derivatives. XII. Fluorescence behaviour of 4-aminomethylene-D2-pyrazoline-5-thiones

Z. Chem. 28 (1988) 103-104

W. Freyer, L.Q. Minh, K. Teuchner

Spectroscopical characteristics of acene-anellated tetrazaporphins

Z. Chem. 28 (1988) 25-26

W. Freyer, K. Teuchner

Luminescence of acenannellated metallo-tetrazaporphins

J. Photochem. Photobiol. A: Chemistry 45 (1988) 117-121

W. Freyer, F. Fink

Photophysics of metallotetra-(2,3-naphtho)-tetraazaporphins

Z. Chem. 28 (1988) 67

W. Werncke, A. Lau, M. Pfeiffer, H.J. Weigmann, W. Freyer, T.J. Tscholl, K.M. Bok

Transient resonance CARS study on the photoisomerization process of bis-dimethylamino-heptamethine-perchlorate (BMC)

Chem. Phys. 118 (1987) 133-139

W. Freyer, L.Q. Minh

Influence of Lewis acids on the absorption behavior of substituted metallotetraazaporphines

J. prakt. Chem. 329 (1987) 365-373

U. Ewert, W. Freyer

EPR-spectroscopic characterization of association of Cu(II)-complexes of vinylogic amides

J. Prakt. Chem. 329 (1987) 1004-1010

W. Freyer, S. Dähne, L.Q. Minh, K. Teuchner

On the fluorescence of tert-butyl-substituted phthalocyanines

Z. Chem. 26 (1986) 334-336

W. Freyer

Synthesis and electronic absorption spektra of tetrakis((dialkylamino)phenyl)-substituted nickel dithiolenes

J. Prakt. Chem. 328 (1986) 253-260

W. Freyer

Absorption behavior of ring-anellated metallotetraazaporphines

Z. Chem. 26 (1986) 217-218

W. Freyer

Electronic spectra of tetra-[2,3-(9,10-anthraquino)]-tetraazaporphin and on related compounds

Z. Chem. 26 (1986) 216-217

W. Freyer, L.Q. Minh

Synthesis of metal complexes of tetra-(2,3-anthra)-tetraazaporphines and comparison of their electronic absorption spectra with other anellated tetraazaporphine systems

Monatsh. Chem. 117 (1986) 475-489

W. Freyer

Interaction of metallotetraazaporphyrins with a mixture of aluminium bromide and acetyl chloride

Z. Chem. 26 (1986) 263-264

F. Fink, W. Freyer, V. Gulbinas, V. Kabelka

Photophysical properties of metallotetraazaporphines

Teubner-Texte Phys. (Ultrafast Phenom. Spectrosc.) 10 (1986) 221-226

K. Teuchner, M. Scholz, H. Stiel, W. Freyer, D. Jadwizak, H. Lucht

Fluorescence investigations in the nanosecond and sub-nanosecond range using the laser pulse fluorometer LIF 200

Preprint 85 -5 des ZOS der AdW (1985) 1-47

W. Freyer, K. Teuchner

Photophysical behaviour of merocyanines

Proc. Symp. Photochem. Photography (1985) 364-371

W. Freyer

Tetraamino-substituted nickel dithiolene chelates - new solvatochromic dyes for describing solvent polarity

Z. Chem. 25 (1985) 104-105

H. Stiel, K. Teuchner, W. Becker, W. Freyer, S. Dähne

Fluorescence lifetime studies of pseudoisocyanine J-aggregates in the subnanosecond range

J. Mol. Struct. 114 (1984) 351-354

V.A. Katulin, A.L. Petrov, W. Freyer

A belachable dithiene filter for an iodine laser

Kvantovaya Elektronika 11 (1984) 115-119

W. Freyer, K. Teuchner

Pyrazolone derivatives. XI: Fluorescence of merocyanines of D2 -pyrazolin-5-ones

Z. Chem. 24 (1984) 23-24

W. Freyer, K. Teuchner

Fluorescence as a purity criterion for derivatives of phenazone. Part 10: Pyrazolone derivatives

Pharmazie 39 (1984) 551-552

W. Freyer

Effect of solvents and substituents on the absorption behavior of neutral nickel dithiolenes

Z. Chem. 24 (1984) 32-33

F. Fink, W. Freyer

Investigation of new absorber dyes for 1,06 mm using ps-spectroscopy

Proc. III. Symposium "Ultrafast phenomena in spectroscopy", Minsk (1984) 300-303

W. Freyer, H. Koeppel, R. Radeglia, G. Malewski

Pyrazolone derivatives. VIII: Proton NMR, 13C-NMR, and IR studies of the tautomerism of nitrogen-15 labeled 3-methyl-1-phenyl-D2-pyrazolin-5-one

J. Prakt. Chem. 325 (1983) 238-250

W. Freyer, L.Q. Minh

Synthesis and light absorption of 2.3-anthraloannelated tetrazaporphyrins

Z. Chem. 22 (1982)186

U. Ewert, R. Stoesser, G. Tomaschewski, W. Freyer

Pyrazolone derivatives. IX: EPR studies on copper(II)complexes of 4-(aminomethylene)-D2-pyrazolin-5-one-type ligands

Monatsh. Chem. 113 (1982) 973-983

W. Freyer, R. Radeglia

Pyrazolone derivatives. VII: Synthesis and structure of metal chelate complexes with 4-aminomethylene-D2 -pyrazolinone-(5) ligands

Monatsh. Chem. 112 (1981) 105-117

W. Freyer, K. Teuchner, S. Dähne

Synthesis and multiple fluorescence behavior of N-trimethylene-bridged p-(N-methylamino)-benzaldehyde

J. Prakt. Chem. 323 (1981) 324-326

W. Freyer

Synthesis of a Q-switch material for iodine laser

ZOS-Preprint (1981) 1-53

W. Freyer

15N-labeled compounds in organic chemistry - relation between structure and nitrogen-15 coupling constants

Z. Chemie 21 (1981) 47-58

W. Freyer

Laserdye Rhodamine

ZOS-Preprint (1980) 1-19

S. Dähne, W. Freyer, K. Teuchner

Dual and multiple fluorescence mechanisms of p-dimethylamino-benzaldehyde and its trimethylene bridged double molecule

J. Luminescence 22 (1980) 37-49

W. Freyer, K.Teuchner, M. Scholz, S. Dähne

Excimer formation of highly polar organic molecules

Proc. Symp. Photochem. Photography (1979) 282-289

W. Freyer, R. Radeglia

Pyrazolone derivatives. VI: A 13C-NMR study of merocyanines of the type 2-pyrazolin-5-one

Monatsh. Chemie 109 (1978) 1093-1098

W. Freyer

UV-spectroscopical and photochemical investigations of azomethines and enamines of pyrazolone-5-type

Proc. Symp. Photochem. Photography (1978) 178-185

W. Freyer

Pyrazolone derivatives. V: UV sopectroscopic and photochemical behavior of N-mono- and N,N-disustituted 4-aminomethylene-D2-pyrazolin-5-ones

J. Prakt. Chem. 320 (1978) 521-532

W. Freyer

Pyrazolone derivatives. IV: Tautomerism and stereochemistry of 4-aminomethylene-D2-pyrazolin-5-ones

J. Prakt. Chem. 320 (1978) 508-520

W. Freyer

UV spectroscopic and photochemical studies on azomethines and enamines of the pyrazolin-5-one type

Proc. Symp. Fotochem. Fotofyz. Ved. Fotogr.: Acad Mezinar. Ucasti, 6th, Pardubice (Czech), (1977) 185-200

W. Freyer

Pyrazolone derivatives. III: A contribution to the stereochemistry of N,N-disubstituted 4-aminomethylene-3-methyl-1-phenyl-D2-pyrazolin-5-ones

J. Prakt. Chem. 319 (1977) 911-918

W. Freyer

Pyrazolone derivatives. II: Synthesis of tautomeric enamines of some 3-substituted 1-phenyl-D2-pyrazolin-5-ones

J. Prakt. Chem. 319 (1977) 905-910

W. Freyer, G. Tomaschewski

Pyrazolone derivatives. I: Synthesis, stereochemistry, and photochemical behavior of azomethines of 1,5-dimenthyl-2-phenyl-4-formyl-D4-pyrazolin-3-one (Antipyraldehyde)

J. Prakt. Chem. 319 (1977) 895-904