Synthesis and Spectroscopic and NLO Properties of “Push-Pull” Structures Incorporating the Inductive Electron-Withdrawing Pentafluorophenyl Group
摘要:
A series of "push-pull" molecules, each incorporating a pentafluorophenyl ring as an inductive accepting group, has been synthesised. The NLO properties of these compounds were measured in solution by EFISH (operating at 1907 nm) and in the solid state by the Kurtz powder technique (at 1907 nm). Values of mubeta, the product of the molecule dipole moment and its first-order hyperpolarizdbility, of up to 200 x 10(-48) esu were obtained.((C) Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002).
Electrostatics and Color: Massive Electrostatic Perturbation of Chromophores by Ion Cluster Ligands
作者:Robert Weiss、Frank G. Pühlhofer
DOI:10.1021/ja064907u
日期:2007.1.1
The SASAPOS protocol, a general reaction sequence allowing complete exchange of various neutral ligands X in organic, elementorganic, and inorganic systems by cationic ligands L+, has been applied to a variety of pentafluorophenyl-substituted dyes of the general formula C6F5-XY-D (X, Y = N, CH; D = donor substituted arene), yielding the corresponding polycationically substituted dyes. The perturbation of the chromophores by the massive electrostatic effects introduced via the SASAPOS method led to bathochromic shifts of the absorption maxima of up 140 nm, 7600 cm(-1), respectively. A strong dependency of the specific shifts on the nature of the connecting pi linker -XY- (N vs CH) has been detected by UV-vis absorption spectroscopy. Additionally, the effects of resubstitution of cationic ligands L+ by OH and O- have been studied.
Novel fluorinated amino-stilbenes and their solid-state photodimerization
作者:Antonio Papagni、Paola Del Buttero、Chiara Bertarelli、Luciano Miozzo、Massimo Moret、Mary T. Pryce、Silvia Rizzato
DOI:10.1039/c0nj00264j
日期:——
We synthesized a series of polyfluoro-amino-stilbenes in satisfactory yields by Wittig reaction of 4-piperazinyl-benzalhehydes with pentafluoro-benzylidene-triphenyl-phosphorane and we analyzed the photochemical behavior of these stilbenes in the solid state; thanks to arene–perfluoroarene π–π interactions, some of them have shown a good propensity to give the corresponding cyclobutane photodimers
A series of "push-pull" molecules, each incorporating a pentafluorophenyl ring as an inductive accepting group, has been synthesised. The NLO properties of these compounds were measured in solution by EFISH (operating at 1907 nm) and in the solid state by the Kurtz powder technique (at 1907 nm). Values of mubeta, the product of the molecule dipole moment and its first-order hyperpolarizdbility, of up to 200 x 10(-48) esu were obtained.((C) Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002).