without changing your settings we'll assume you are happy to receive all RSC cookies.
You can change your cookie settings by navigating to our Privacy and Cookies page and following the instructions. These instructions
are also obtainable from the privacy link at the bottom of any RSC page.
A new series of second-order nonlinear optical chromophores has
been synthesized that consists of a conjugated segment end-capped with
an electron acceptor and an electron donor, respectively, and a central
spacer intended to modulate the electro-optical effect. Conjugated
chains have been tailored with trans-vinylene-1,5-thienylene as
the building unit and N,N-dimethylamino and nitro
groups as the donor–acceptor pair. Four spacers have been
incorporated into the central part of the conjugated oligomers, which
range from saturated to totally unsaturated functions, i.e.
from methylene to vinylene units. The general strategy relies upon two
consecutive Wittig or Wittig–Horner reactions between the spacer
precursor and an aromatic phosphonium or phosphonate bearing the strong
electron donor and the acceptor, respectively. Two synthetic pathways
have been studied. The first procedure is based on the use of a
symmetric precursor for the spacer. However, a reaction byproduct is
formed, which must be removed and decreases the reaction efficiency. The
second approach requires an asymmetric precursor for the spacer, the
synthesis of which is a multistep process. In order to evaluate the
effect of the spacer, a completely conjugated oligomer has been prepared
by the one-step coupling of two conjugated segments end-functionalized
by the electron donor and the acceptor, respectively.
Fetching data from CrossRef. This may take some time to load.
Journal of the Chemical Society, Perkin Transactions 2
- Information Point
This text is added as a work around for heading error in Accessibility testing