Solvatochromie von 80 mμ in verschiedenen Alkoholen bei Arylidenisophoron‐Abkömmlingen

Abstract

Das Anion der p‐Hydroxy‐phenylverbindung 6f löst sich in Wasser mit roter, in Methanol mit purpurroter, in Äthanol mit violetter und in Isopropylalkohol mit blauer Farbe.Lösungen in Aceton werden auf Zusatz von wenig Base grün, mit mehr wäßr. Alkali blau. Die halo‐chrome Solvatochromie von 6b, 6l, 6p und 6r, die Halochromie von 6t(Tab. 1) sowie die Darstellung der Verbindungen 6a–6v wird ergänzt durch weitere UV‐VIS‐ und IR‐Daten.

Organic Phenolic Configurationally Locked Polyene Single Crystals for Electro‐optic and Terahertz Wave Applications

“…Synthesis of OH1: The 2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile (OH1) chromophore was synthesized by Knoevenagel condensations according to literature [9, [12][13][14]. 4-Hydroxybenzaldehyde (17.6 g, 144 mmol) and the intermediates 2-(3,5,5-trimethylcyclohex-2-enylidene)malononitrile (24.8 g, 144 mmol) were dissolved in ethanol (500 mL).…”

“…The OH1 chromophore was synthesized by consecutive Knoevenagel condensations. [12][13][14] For introducing phenolic electron and hydrogen bond donor sites 4-hydroxybenzaldehyde was used for the synthesis. In order to retain high thermal stability and the tendency for inducing an acentric packing, [9] structurally asymmetric groups were incorporated in the cyclohexene ring of the OH1 chromophore as demonstrated in some previously studied CLP crystals.…”

“…[11] Here we investigate a novel, very promising CLP crystal, OH1 (2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile) containing a phenolic electron donor in the p-conjugated part, which also acts as a hydrogen bond donor site. Although the synthesis and the crystal structure of this material have been previously reported, [12,13] its parameters relevant for second-order nonlinear optical applications have not been examined yet. The OH1 chromophores exhibit high We investigate a configurationally locked polyene (CLP) crystal 2-(3-(4-hydroxystyryl)-5,5-dimethylcyclohex-2-enylidene)malononitrile (OH1) containing a phenolic electron donor, which also acts as a hydrogen bond donor.…”

Dynamics of transfer of electron excitation in a donor-acceptor system with a carbon chain and ways of its relaxation

“…1. The procedure for the synthesis of the compound was described in the papers [7,8]. In the molecule, two trimethylene bridges are used to block the conformational changes of the amino group.…”

Novel organic material with potential NLO application - electronic and spectroscopic properties

“…A series of dicyanoisophorones have been synthesized and their structures determined by single crystal X-ray diffraction by Kolev and co-authors [4][5][6][7][8][9][10][11]; previous studies by Lemke [12], Desai and co-authors [13] and detailed Raman studies [14] of these compounds served as a base for the research. The experimental and computational studies of the vibrational spectra of differently substituted dicyanoisophorones have been reported as well [15][16][17][18].…”