Materials Literature
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Polymer stabilized liquid crystalline systems (PSLCs) have been of considerable research interest due to their great potential in liquid crystal display applications. Of particular importance in the properties of PSLC systems is the evolution of the polymer nanostructure. The unique characteristics of fluorinated mono…
Abstract Copolyesters with an alternating sequence of terephthalic acid and aliphatic dicarboxylic acids were prepared with three different methods. First, dicarboxylic acid dichlorides were reacted with bis(2‐hydroxyethyl)terephthalate (BHET) in refluxing 1,2‐dichlorobenzene. Second, the same monomers were polyconden…
4-Dimethylaminopyridin (DMAP) macht's möglich: Mit seiner Hilfe lassen sich metallische Nanopartikel effizient von einer organischen in eine wässrige Lösung transferieren. Das Bild zeigt den Transfer von Gold-Nanopartikeln von Toluol in die wässrige Phase durch Zugabe von DMAP (0.1 M, pH 10.5). Mit dieser Methode ist…
Uniform-size poly(tetrahydrofuran)s (poly(THF)s) having N -phenyl or N -methylpyrrolidinium salt end groups ( 1 p and 1 m, respectively) carrying a dicarboxylate counteranion have been prepared as ionic polymer precursors for an intramolecular cyclization reaction. Thus, 4,4‘-biphenyldicarboxylate ( 2a ) was first int…
Caged but not trapped! Caged reagents are molecules from which biological effectors are released by photolysis. Here, p-hydroxyphenacyl bromide is used to derivatize a model peptide containing a thiophosphotyrosine residue in order to mimic phosphorylation at tyrosine. Upon photolysis, a biologically active peptide is…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA New Synthetic Route to Benzoxazole Polymer via Tandem Claisen RearrangementGang Yang, Shin-ichiro Matsuzono, Emiko Koyama, Hideo Tokuhisa, and Kazuhisa HirataniView Author Information Nanoarchtectonics Research Center, National In…
Von organischen Radikalen zu Metallkomplexen konnte das bekannte Konzept für Ferroelektrika erfolgreich ausgedehnt werden: Die Abbildung zeigt ein Cyclophan-artiges Molekül mit einem Triplett-Grundzustand, in dem zwei CuII-Zentren von einem doppelten m-Phenylendiamid-Gerüst zusammengehalten werden.
5,10,15,20-Tetraphenyl-21 H,23 H -porphine manganese(III) chloride (Mn III TPP(Cl)) was encapsulated into MCM-41 and TiMCM-41, and its photoinduced electron transfer had been studied by using femtosecond diffuse reflectance photolysis. Two different transient species (c.a. 10 ps and c.a. 80 ps) were observed. The shor…
We report studies on the average molecular orientation state in steady and transient shear flow of two lyotropic liquid crystalline polymers: poly(benzyl glutamate) [PBG] and hydroxypropylcellulose [HPC], both in m -cresol solution. An annular cone and plate X-ray shear cell is used to probe molecular orientation in t…
The synthesis, spectroscopic properties, and electrochemistry of (BCA)Co(2) and (BCB)Co(2) are described where BCA and BCB represent biscorroles linked by an anthracenyl (A) or a biphenylenyl (B) bridge. The pyridine and CO binding properties of (BCA)Co(2) and (BCB)Co(2) are also presented, and one of the compounds in…
A novel series of poly(benzyl ether) type dendritic distyrylbenzenes bearing various electron or hole affinitive moieties including 1,3,4-oxadiazole, cyano, and propoxy groups on the outer surface of the first- and second-generations dendritic wedges have been synthesized for blue-light emission. Both theoretical and…
Alkoxides are of great interest as precursors for sol-gel processing of advanced ceramic materials, but there is very little general knowledge about the low-valent 3d-element alkoxides. The novel oxo-alkoxide, [Mn19O12(moe)14-(moeH)10].MOEH (MOE = OC2H2-OCH3), was prepared, by metathesis and auto-decomposition, from M…
Comparison of the thermal spin crossover transition in solution of a Fe(II) dinuclear triple helicate with the analogous mononuclear complex shows that the helicate transition takes place over a wider temperature range in a two step process, implying negative cooperativity.
The synthesis of 2-[3,4-bis(n-alkan-1-yloxy)phenyl]-2-oxazolines with alkan = octan, decan, dodecan, and tridecan is presented. Their living cationic ring opening polymerization produces cylindrical macromolecules that self-organize in a hexagonal columnar two-dimensional phase. The structural analysis of these polyme…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTFormation of an Amylose−Polyester Inclusion Complex by Means of Phosphorylase-Catalyzed Enzymatic Polymerization of α-d-Glucose 1-Phosphate Monomer in the Presence of Poly(ε-caprolactone)Jun-ichi Kadokawa, Yoshiro Kaneko, Atsushi Na…
Abstract High‐refractive‐index aminoalkoxysilane‐capped pyromellitic dianhydride (PMDA)–titania hybrid optical thin films (TP0–TP8) were synthesized and characterized in this study. They were prepared with PMDA, aminopropyltrimethoxysilane, and titanium(IV) isopropoxide via a sol–gel process followed by spin coating a…
Five new bufadienolides, 3beta-formyloxyresibufogenin (1), 19-oxobufalin (2), 19-oxodesacetylcinobufagin (3), 6alpha-hydroxycinobufagin (4), and 1beta-hydroxybufalin (5), have been isolated together with the previously known bufadienolides 6-20 from the Chinese traditional drug "Ch'an Su". The structures were elucidat…
Photochromic diarylethenes that have p-phenylene-substituted benzothiophene aryl groups with and without nitronyl nitroxide radicals at both ends of the molecules were synthesized. The absorption maxima of the closed-ring isomers showed a hypsochromic shift with the increase in the pi-conjugated chain length. The uniq…
First organic radicals, now metal complexes: A successful extension to metal complexes of a well-known organic radical approach to ferromagnetism is exemplified by the triplet ground-state molecule containing two Cu(II) centers connected by a double m-phenylenediamide skeleton of the cyclophane type shown in the schem…
We present the results of theoretical investigation on the electronic structure, bonding nature and ground state properties of Th$_2$Al and Th$_2$AlH$_4$ using generalized-gradient-corrected first-principles full-potential density-functional calculations. Th$_2$AlH$_4$ has been reported to violate the "2 Årule" of H-H…