Y. Takeoka

Synthesis and evaluation of phosphonated poly(4-phenoxybenzoyl-1,4-phenylene)

Poly(4-phenoxybenzoyl-1,4-phenylene) (PPBP), which has high thermal stability and mechanical properties, was phosphonated by the three-step reaction. The phosphonated PPBP (P-PPBP) was characterized by FT-IR, 1 H-NMR, elemental analysis, and ICP emission spectroscopy. The thermal and electrical properties of P-PPBP were also investigated. The P-PPBP film containing 40 mol % phosphonic acid groups showed a proton conductivity of about 10 -4 S cm -1 at 90 %R.H.

Intercalated formation of two-dimensional and multi-layered perovskites in organic thin films.

Two-dimensional and multi-layered perovskites, [NH3(CH2)12NH3]PbBr4 and [NH3(CH2)12NH3](CH3NH3)(n-1)Pb(n)Br(3n+1), with a quantum confinement effect have been naturally formed by intercalating lead bromide into organic alkyldiammonium bromide frameworks.

Molecular design of layered zirconium phosphonates for fuel cell applications

Abstract Preparation and characterization of two-dimensional zirconium phosphonate derivatives in either crystalline or amorphous forms have been investigated. Composite zirconium phosphonates in single crystal phase have also been investigated and characterized by XRD and 31 P-MASNMR. These compounds are lamellar structures comprising zirconium phosphates or organophosphonates. The hydroxyl groups or sulfomethyl groups are bonded through the phosphorous atoms to an inorganic framework made of oxygen and zirconium atoms. Compounds were characterized for their proton-conductivity as a function of temperature and relative humidity.

Thermochromic and solvatochromic properties of poly(thiophene) derivatives with liquid crystal moiety

Regioregular poly(thiophene) derivatives with liquid crystal moiety, poly(3-[2-(4-fluorobenzyloxyethyl)]thiophene) (HT-PFBET) and poly(3-[2-benzyloxyethyl]thiophene) (HT-PBET), were synthesized using cross-coupling reaction according to the Rieke method. Thermochromism of HT-PFBET and HT-PBET was studied by electronic absorption measurements. HT-PFBET gave rise to a clear isosbestic point, while HT-PBET exhibited no isosbestic point with increasing temperature. This is due to a morphological effect induced by fluorine atoms.