Synthesis and spectroscopic properties of 4-amino-1,8-naphthalimide derivatives involving the carboxylic group: a new molecular probe for ZnO nanoparticles with unusual fluorescence features

• Laura Bekere,
• David Gachet,
• Vladimir Lokshin,
• Wladimir Marine and
• Vladimir Khodorkovsky

Beilstein J. Org. Chem. 2013, 9, 1311–1318, doi:10.3762/bjoc.9.147

• is twisted out of the molecule plane and does not contribute to either orbital. The degree of charge transfer is not large, which accounts for the relatively moderate solvatochromism. The calculated IP and EA values are 7.13 and 0.78 eV, respectively. Derivative 4 should thus exhibit stronger

Diarylethene-modified nucleotides for switching optical properties in DNA

• Sebastian Barrois and
• Hans-Achim Wagenknecht

Beilstein J. Org. Chem. 2012, 8, 905–914, doi:10.3762/bjoc.8.103

• chromophores to oligonucleotides offers potentially interesting optical characteristics, among these being solvatochromism and red-shifted exciplex-type fluorescence [38]. Such absorption and fluorescence readouts are potentially suitable for DNA probing [39][40][41]. On the other hand, with respect to

Predicting the UV–vis spectra of oxazine dyes

• Scott Fleming,
• Andrew Mills and
• Tell Tuttle

Beilstein J. Org. Chem. 2011, 7, 432–441, doi:10.3762/bjoc.7.56

• illustrated in Figure 1 for clarity. All the dyes are based on an anthracene skeleton in which one carbon is replaced by a nitrogen atom and another by an additional heteroatom such as N, O, or S in the central ring. Although azine dyes have been found to demonstrate solvatochromism [1][2][3], and many

• thiazine dyes are metachromatic [4][5], this investigation is limited to the study of oxazine dyes. Oxazine dyes are useful partly because they exhibit solvatochromism, this makes them sensitive to their surrounding environment, and hence they have been utilized in various applications as molecular probes

• [6][7][8]. In the current investigation we focus on the ten oxazine dyes shown in Figure 2, which are readily soluble in aqueous solution, in order to determine the ability of computational methodology to describe the solvent dependence on the absorption maxima. Solvatochromism in oxazine dyes has

Donor-acceptor substituted phenylethynyltriphenylenes – excited state intramolecular charge transfer, solvatochromic absorption and fluorescence emission

• Ritesh Nandy and
• Sethuraman Sankararaman

Beilstein J. Org. Chem. 2010, 6, 992–1001, doi:10.3762/bjoc.6.112

• estimated from the electrochemical and spectral data for these derivatives. The HOMO and LUMO surfaces were obtained from DFT calculations. Keywords: charge transfer; fluorescence; solvatochromism; solvent effect; triphenylene; Introduction Fluorescent molecular probes that emit in the visible region and

Chromo- and fluorophoric water-soluble polymers and silica particles by nucleophilic substitution reaction of poly(vinyl amine)

• Katja Hofmann,
• Ingolf Kahle,
• Frank Simon and
• Stefan Spange

Beilstein J. Org. Chem. 2010, 6, No. 79, doi:10.3762/bjoc.6.79

• , β and π*, respectively. corresponds to a standard process, referenced to a nonpolar medium. a, b and s represent solvent-independent regression coefficients which reflect the relative influence of each of the three parameters. UV–vis spectroscopy The solvatochromism of 1-M and 1-P was investigated

• ][43]. Solvent-independent correlation coefficients a, b and s of the Kamlet–Taft parameters α, β and π*; solute property of the reference system , correlation coefficient (r), standard deviation (sd), number of solvents (n) and significance (f) for the solvatochromism of 1-M and 1-P. Fluorescence

• (r), standard deviation (sd), number of solvents (n) and significance (f) for the fluoro-solvatochromism of 1-M and 1-P. Acknowledgements Financial support from the Deutsche Forschungsgemeinschaft, Bonn and the delivery of chemicals from the BASF SE, Ludwigshafen, is gratefully acknowledged. The 2,6