Miller, Robert D. and Moylan, Christopher R. and Reiser, Oliver and Walsh, Cecilia A. (1993) Heterocyclic Azole Nonlinear Optical Chromophores .1. Donor-Acceptor Substituted Pyrazole Derivatives. Chemistry of Materials 5 (5), pp. 625-632.
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We have described the synthesis of a variety of 1,3,1,4, and 1,5 donor-acceptor conjugation extended substituted pyrazole derivatives and have studied their spectr6scopic and nonlinear optical properties. These materials are thermally stable and absorb strongly in the UV-visible
region, albeit at much shorter wavelengths than comparably substituted cyclic azapolyenes such as 2-pyrazolines. Quadratic hyperpolarizability measurements suggest that the pyrazoles are significantly nonlinear, and that 1,3 and 1,4 substitution is preferred. 1,5 substitution causes
a significant drop in the nonlinearity and a blue shift in the long-wavelength absorption maximum, presumably due to a twisting and partial deconjugation of the substituents to relieve unfavorable steric interactions. The experimental results are compared with those predicted by simple “finite field” computational procedures.
|Institutions:||Chemistry and Pharmacy > Institut für Organische Chemie > Lehrstuhl Prof. Dr. Oliver Reiser|
|Subjects:||500 Science > 540 Chemistry & allied sciences|
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Unknown|
|Owner:||Helge Knüttel (ADMIN)|
|Deposited On:||14 Aug 2006|
|Last Modified:||05 Aug 2009 13:22|