Henk Fidder, Alexandra Lauer, Wolfgang Freyer, Benjamin Koeppe, and Karsten Heyne
	Photochemistry of Anthracene-9,10-endoperoxide
	Submitted to J. 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
	Download PDF/PS-File:
	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