Jun-ichi Kadokawa

Intercalation of colored organic anions into insulator host lattices of layered double hydroxides

Abstract Colored organic anions such as tetra (4-carboxyphenyl)porphyrin (TPP-C), tetra(4-sulfonatophenyl)porphyrin (TPP-S), tetracarboxyphthalocyaninato cobalt (TPC-C) and others were intercalated into the Mg Al and Zn Al layered double hydroxides (LDHs). After the intercalation of organic anions, interlayer spacing of the LDHs increased to 7.8–30.7 A depending on the amounts of intercalated anions and the sizes of these anions. The amounts of intercalated organic anions reached 48–100% of the exchange capacity of the Zn Al LDH. Absorption maxima of TPP-C and TPP-S intercalates were from 439 to 445 nm and longer than 414 to 420 nm, respectively, of TPP-C and TPP-S alone in solvents.

Disproportionation of diarylmethanol derivatives by using supercritical water

Non-catalytic disproportionation of diarylmethanol derivatives was found to proceed efficiently in supercritical water. This method was also applied to various diarylmethylamine derivatives to give the disproportionation products in good yields.

Effect of diaminotoluene on the decomposition of polyurethane foam waste in superheated water

Post-use polyurethane (PU) foam was degraded in superheated water at 423 to 623 K. The yield of diaminotoluene (TDA), one of the products, reached near 90%. The hydrolysis conditions (time and temperature) were important and the perfect liquid products could be obtained under the economic conditions at 523 K for 30 min. TDA was added to the reaction to investigate the effect on the decomposition of PU foam waste. However, in our conditions, basic additives only slightly improved the yield of TDA.

Synthesis of an amylose–polymer inclusion complex by enzymatic polymerization of glucose 1-phosphate catalyzed by phosphorylase enzyme in the presence of polyTHF: a new method for synthesis of polymer–polymer inclusion complexes

The enzymatic polymerization of α-D-glucose 1-phosphate (Glc-1-P) with phosphorylase in the presence of polytetrahydrofuran (polyTHF) leads to an amylose–polyTHF (polymer–polymer) inclusion complex; the present reaction system provides a new method for the preparation of polymer–polymer inclusion complexes.

Ring‐Opening Polymerization of Ethylene Carbonate Catalyzed with Ionic Liquids: Imidazolium Chloroaluminate and Chlorostannate Melts

Ring-opening polymerization of ethylene carbonate in the presence of ionic liquids, 1-butyl-3-methylimidazolium chloroaluminate melt and 1-butyl-3-methylimidazolium chlorostannate melt, has been investigated. Polymerization takes place accompanied with decarboxylation even at temperatures below 100°C under the reaction conditions selected to give poly(ethylene ether-carbonate)s.

Synthesis of Hyperbranched Aminopolysaccharides

Sugar dihydroozaxole monomers with two free hydroxyl groups undergo acid-catalyzed polymerization to hyperbranched aminopolysaccharides [Eq. (a)]. Their molecular weights were determined by the light-scattering method to be between 2.3×105 and 7.6×105 . The degree of branching determined by 1 H NMR spectroscopy after reaction with [iPr2 Si(Cl)]2 O is close to the ideal value. Ts=MeC6 H4 SO2 , CSA=10-camphorsulfonic acid.

Ring-opening polymerization of lactones catalyzed by ion-exchanged clay montmorillonite

Tin ion-exchanged montmorillonite catalyzed the ring-opening polymerization of δ-valerolactone in a solvent free system. The polymerization proceeded in a living manner, giving rise to poly(δ-valerolactone)s with controlled molecular weights. Aluminium and iron ion-exchanged montmorillonites were also effective for the polymerization. Furthermore, the copolymerization of δ-valerolactone with γ-butyrolactone took place in the presence of the montmorillonite to produce the corresponding copolymers.

Preparation and photochromism of sulfonated spiropyran-silica nanocomposites

Reversible and stable photochromic properties of sulfonated spiropyran (SP-SO3−) were achieved by trapping SP-SO3− in a silica matrix by the sol-gel route. The presence of organic anions was essential for the photochromic properties, indicating the importance of the coexistence of polar and non-polar regions. The half-life time (t1/2) of the photoinduced merocyanine (MC) trapped in the silica matrix in the presence of dodecylbenzenesulfonic acid (DBS) was larger than 30 days (k<2.7 × 10−7 s−1). The reversibility of SP-SO3− was improved by the addition of triplet quenchers such as benzophenone, naphthalene and anthracene.

Preparation of New Inorganic—Organic Layered Compounds, Hydroxy Double Salts, and Preferential Intercalation of Organic Carboxylic Acids into Them

Abstract New inorganic—organic layered compounds were prepared by ion-exchange reactions of zinc-nitrate and copper-nitrate HDSs with organic carboxylic acids whose interlayer spacings increased depending on the sizes of carboxylic acids. The amounts of ion-exchanged 2-naphthoic acid and 2,6-naphthalene dicarboxylic acid were larger than those of 1-naphthoic acid and 2, 7-naphthalene dicarboxylic acid, respectively, indicating the molecule recognition ability of the HDSs.

Preparation of new organic-inorganic nanocomposite by intercalation of organic compounds into MoO3 by ultrasound

Abstract 4-Substituted pyridines were reacted with the layered host lattice MoO 3 using ultrasonic wave irradiation. XRD patterns and TG spectra showed the formation of new organic-inorganic nanocomposites. XPS spectra showed that no reduction of Mo metal occurred through the reaction. These results and IR spectra indicated that pyridimium ion interacted with oxygen of MoO 3 by hydrogen bonding.