Supramolecular Polymer Networks Based on Calix[5]arene Tethered Poly(p-phenyleneethynylene)
摘要:
A poly(p-phenyleneethynylene) polymer (PC[5]), featuring two pi-rich cone-like calix[5]arene cavities (assembling cores) connected to a rigid p-phenyleneethynylene spacer, was synthesized by a Pd-catalyzed cross-coupling reaction. NMR investigations provide support for the self-assembly dynamics of PC[5] (homopolytopic host molecule) and complementary 1,10-decanediyldiammonium (C-10) guest in solution in the construction of supramolecular polymer networks. Upon variation of the host/guest molar ratio, two distinct types of assemblies were identified in solution: a 1:2 bis-endo-cavity assembly C-10 subset of PC[5]superset of C-10 (PC[5](cap)) and a polycapsular polymer network assembly PC[5]superset of C-10 subset of PC[5] (PC[5](net)). The reversibility of the assembly/disassembly processes of PC[5](net) and PC[5](cap) upon successive additions of Et3N and TFA was also investigated. AFM analysis of PC[5](net) revealed the formation of a homogeneous continuous network on, surface.
Influence of the Grafting Density on the Self-Assembly in Poly(phenyleneethynylene)-g-poly(3-hexylthiophene) Graft Copolymers
摘要:
Conjugated graft copolymers consisting of a chiral poly(phenyleneethynylene) (PPE) backbone and poly(3-hexylthiophene) side chains (P3HT) with different grafting degrees were synthesized. While PPE was prepared by classical Sonogashira couplings, the end-functionalized P3HT was prepared by a controlled Kumada catalyst transfer poly-condensation (KCTP) allowing the installation of an acetylene end group. After some postpolymerization reactions on the PPE to introduce azide groups, the P3HT was clicked to the PPE through the CuAAC coupling reaction. Subsequently, the (chiral) self-assembly of these materials was studied by means of UV vis and CD spectroscopy, AFM, and DSC. Finally, fluorescence spectroscopy is used to study the quenching of the PPE fluorescence by P3HT.
Three new topology-varied rod-coilblockcopolymers, comprising the same oligo(p-phenyleneethynylene) (OPE) rod components and the same coil components, were synthesized by atom-transfer radical polymerization. Their photophysical properties were systematically studied and compared in consideration of their solid-state structures and self-assembly abilities. These copolymers have similar intrinsic photophysical
Organic thin film transistors comprising thienyl oligomers and their use as gaseous phase sensors
申请人:Babudri Francesco
公开号:US20100140597A1
公开(公告)日:2010-06-10
This invention pertains to gaseous analytes sensor devices comprising organic thin film transistor and, in particular sensors able to perform the enantiomeric discrimination of gaseous analytes. The organic thin films are characterized by comprising a compound of formula (I).