New conjugated polyfluorenes carrying main-chain bipyridyl fragments as efficient fluorescent chemosensors for transition-metal ions

New conjugated fluorescent bipyridyl-containing polyfluorenes are synthesized. They feature fluorescence, can chelate with metal ions, combine solubility in organic solvents with high thermal characteristics, and exhibit high selectivity and sensitivity to terbium ions. Polyfluorenes are promising for use as a basis for the design of efficient fluorescent chemosorbents.     

New magnetic nanomaterials based on ferrocene-containing polymers synthesized under ultrasonic irradiation

Russian Chemical Bulletin - A new magnetic nanomaterial was obtained based on soluble ferrocene-containing poly-phenylene synthesized under ultrasonic irradiation at room temperature. The maximum...     

Por?se Struktur der Polyarylate

Ohne Zusammenfassung     

The mechanism of chemical modification of artificial fibers based on cellulose derivatives

A fabric based on cellulose derivatives has been hydrophobized via coating with oligochloromethylethoxysiloxane and then treated with butyl alcohol, benzyl alcohol, and higher fatty alcohols. With the use of X-ray photoelectron spectroscopy, it has been shown that the reaction of alcohols with the siloxane coating proceeds through the exchange of ethoxysilane groups for higher alkoxy groups, whereas the expected reaction of chloromethyl groups with alcohols (the Williamson reaction) does not occur under the chosen conditions.     

Crystallization of polyterephthalates of bis(4-hydroxy-3-chlorophenyl)-2,2-propane

Crystallization of polyterephthalates of bis(4-hydroxy-3-chlorophenyl)-2,2-propane synthesized by an acceptor–catalytic polyesterification has been investigated quantitatively. It was found that in a homogeneous medium (in solvents for the polymer) amorphous polymers are formed, while polycondensation in a heterogeneous system (in nonsolvents for the polymer) gives rise to crystalline polyarylates, their degree of crystallization being dependent on synthesis conditions. Secondary treatment of resulting polymers can result in their crystallization and amorphization. Along with molecular weight the physicomechanical properties are significantly affected by the preparation method.     

Reaction of diisopropyl benzeneboronate with free radicals

Summary When diisopropyl benzeneboronate is treated with free radicals the initially formed diisopropyl benzeneboronate radical undergoes decomposition, which is reflected in the structure of the obtained polymer.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 2, pp. 367–368, February, 1965     

Synthesis and study of internally complex compounds of o-methoxythiophenol with metals

Conclusion Internally complex compounds of o-methoxythiophenol with a number of divalent metals have been obtained and some of their properties have been studied. The stabilities of the chelates synthesized have been evaluated by potentiometric titration at 25 °.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 11, pp. 2050–2051, November, 1966.