Liquid Crystals of Dendron-like Pt Complexes Processable into Nanofilms
Abstract
A series of (cholesteryl) 2,5-dibromobenzoate dendrons consisting of a first generation (G1=1 (cholesteryl) 4-benzoate), second generation (G2=2 (cholesteryl)s 4-benzoates) and third eneration (G3=4 (cholesteryl)s 4-benzoates) were synthesized step-by-step by the convergence approach. The 2,5-dibromo G1, G2 and G3 synthesized dendrons were subjected to co-polymerization with (butyl) 2,5-diethynyl benzoate by the Sonogashira cross-coupling reaction to afford rigid rod-like vermicular dendrimers of the phenyleneethynylene type, which resulted be very soluble in non-polar solvents such as CHCl3, THF, toluene. Their chemical structures were analyzed by 1H, APT, DEPT-135, 13C NMR, however for their correct proton-carbon assignation, it was necessary to carry out 2D-HETCOR correlations. The thermal properties studied by DSC, TGA and Polarized light microscopy showed that all of the (cholesteryl) 2,5-dibromobenzoate dendrons exhibited a mesomorphic behavior: Crystal (double arrow) Smectic C (or Nematic) (double arrow) Isotropic transitions, where mesophases are presented in a very short temperature range. In what concerns to the copolymers, in spite of that they do not exhibit any know texture reported in the literature, however they seem to exhibit Smectic C and/or Nematic mesophases, nonetheless the study of X-ray at small angle is necessary in order to better determine their real supramolecular order of the mesophase(s).
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 2013
- Accession Number
- ADA590637
Entities
People
- Eduardo Arias
- Ivana Moggio
- Ronald F. Ziolo