2 research outputs found
Effects of Substituent on Binaphthyl Hinge-Containing Conductive Polymers
Conductive polymers containing hinged 1,1′-binaphthyl
were
synthesized. Their conformational flexibility around the 1,1′
C–C bonds was found to vary with the substituents at the 2,2′-positionshydroxy,
linear alkyloxy, and macrocyclic alkyloxy groups were compared. Macrocyclic
alkyloxy groups appeared to immobilize the binaphthyl. The connection
patterns of electroactive oligothiophenes to the binaphthyl groups
were also investigated with 6,6′- and 7,7′-attachments.
The substituents binaphthyl polymers were examined using cyclic voltammetry, <i>in situ</i> conductivity measurements, and spectroelectrochemistry.
Their electronic properties were found to vary greatly with the substituents
and their connectivity. Binaphthyl polymer with hydroxyls and 3,4-ethylenedioxythiophenes
exhibited interesting charge-trapping properties. 7,7′-Substitution
led to intrachain interactions, which were promoted by the presence
of linear alkyl chains. The observed properties give binaphthyl hinge-containing
conductive polymers potential applicability in chiral electroactive
sensors, polymer actuators, and electrochromic and optoelectronic
devices
Enhancement of Photoinduced Electron Transfer in Self-Assembled Polymer Films Using Mixed Metal–Terpyridine Complexes
The design and synthesis of photoactive
polymeric systems are important
in regard to solar energy harvesting and utilization. In this report,
we synthesized photoactive polymeric thin films via iterative self-assembly
using reversible metal–terpyridine (M–tpy) interactions.
The growth rate of thin film deposition depends on the metal ion of
choice. RuÂ(II)Â(tpy)<sub>2</sub>-incorporated polyÂ(vinyl alcohol) also
functionalized with tpy was subjected to iterative self-assembly on
glass substrates. UV–vis spectroscopy and surface profilometer
investigations show that the polymeric thin films with CuÂ(II) grew
2 times faster than those with ZnÂ(II), attributed to the strong M–tpy
interaction. Interestingly, photocurrent generated in the polymeric
thin films with ZnÂ(II) was much higher than those of other films.
The apparent diffusion rate constant (<i>k</i><sub>app</sub>) was measured for the electron hopping process via potential-step
chronoamperometry. As a result, the <i>k</i><sub>app</sub> for the polymeric thin films with ZnÂ(II) was almost 2 times larger
than those with other metal ions. The choice of metal ions appears
crucial in the mixed metal–tpy complex systems not only for
the film growth but also for the efficient photoinduced electron transfer