1. El-Sayed, M., T. Blaudeck, F. Cichos and S. Spange, 2007. Synthesis and studying the photophysical properties of 3-(4-Di(2-hydroxyethyl)amino)-phenyl-1-(2-furyl)-2-propene-1-one. J. Photo-Chem. Photobiol., 185: 44-50.
2. El-Sayed, M. and S. Spange, 2007. Synthesis, properties and solvatochromism of 1,3-dimethyl-5-{(thien-2-yl)-[4-(1-piperidyl) phenyl]methylidene}-(1H,3H)-pyrimidine-2,4,6-trione. J. Phys. Org. Chem., 20: 264-270.
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3. El-Sayed, M. and S. Spange, 2007. Linear solvation energy (lse) correlation of the solvatochromic response of amino acid functionalized chromophores. J. Phys. Chem. B, 111: 7224-7233.
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4. El-Sayed, M., B. Walfort, H. Lang and S. Spange, 2005. Structure and solvatochromism of heteroaromatic amino ketones containing thiophene moieties. J. Phys. Org. Chem., 18: 1086-1098.
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5. El-Sayed, M., A. Seifert and S. Spange, 2005. Internal polarity of class I and class II type sol-gel hybrid materials using aromatic aminoketones as solvatochromic probes for adsorbed solvents and the silicatic cage. J. Sol-Gel Sci. Technol., 34: 77-94.
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6. El-Sayed, M., H. Muller, G. Rheinwald, H. Lang and S. Spange, 2003. UV/Vis spectroscopic properties of N-(2’-hydroxy-4’-N,N-dimethylaminobenzylidene)-4-nitroaniline in various solvents and solid environments. Chem. Mon., 134: 361-370.
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7. El-Sayed, M., H. Muller, G. Rheinwald, H. Lang and S. Spange, 2003. Solvatochromism, crystallochromism and solid state structures of hydrophilically functionalized aromatic amino ketones containing furan and thiophene rings. Chem. Mater., 15: 746-754.
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8. Spange, S., M. El-Sayed, H. Muller, G. Rheinwald, H. Lang and W. Poppitz, 2002. Solid-state structures of N-substituted Michler’s ketones and their relation to solvato-chromism. Eur. J. Org. Chem., 24: 4159-4168.
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9. Zimmermann, Y., M. El-Sayed, S. Prause and S. Spange, 2001. The solvent-like nature of silica particles in organic solvents. Chem. Mon., 132: 1347-1361.
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10. El-Sayed, M., H. Muller, G. Rheinwald, H. Lang and S. Spange, 2001. Linear solvation energy (LSE) correlations of the solvatochromic response and X-ray structure analysis of hydrophilically N-substituted Michler’s ketone derivatives. J. Phys. Org. Chem., 14: 247-255.
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