- An efficient route for design of luminescent composite materials based on polyethylene containing europium dibenzoylmethanate
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Luminescent composite materials based on linear polyethylene doped by a well dispersed tetrakis dibenzoylmethanate europium complex have been developed. The anion of the latter serves as an efficient light harvesting antenna and possesses the desired photophysical properties. The targeted modification of the Eu complex, namely introduction of a long hydrocarbon chain into the tetraalkylammonium cation [RNEt3]+, has ensured the compatibility of the complex with the polyethylene matrix. The [RNEt3]+ cation has been obtained by using long-chained 1-iodoalkanes synthesized via the Nd-catalyzed ethylene oligomerization process. The photophysical properties and the homogeneity of the obtained composites have been controlled by optical spectroscopy, luminescence intensity mapping as well as scanning electron microscopy.
- Roitershtein, Dmitrii M.,Puntus, Lada N.,Lyssenko, Konstantin A.,Taidakov, Ilya V.,Varaksina, Evgenia A.,Minyaev, Mikhail E.,Gerasin, Victor A.,Guseva, Maria A.,Vinogradov, Alexey A.,Savchenko, Maria S.,Nifant'Ev, Ilya E.
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- Synthesis and biological activity of azasqualenes, bis-azasqualenes and derivatives
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Azasqualenes, bis-azasqualenes and derivatives, designed as inhibitors of squalene 2,3-epoxide cyclase, a key enzyme in sterol biosynthesis, were synthesized and their in vitro activities against a variety of yeasts, fungi, gram-positive and gram-negative bacteria were determined.The synthesis involves a new method of squalene degradation, together with an unusual procedure for the aminative reduction of lipophilic aldehydes.A study of the structure-activity relationship was attempted for different biological parameters: anti-bacterial and anti-fungal activities (MIC), inhibition of mycelial growth (GTT), surfactant activity (CMC) and membrane perturbation activity (induction of leakage in liposomes).
- Ceruti, Maurizio,Balliano, Gianni,Viola, Franca,Cattel, Luigi,Gerst, Nicolas,Schuber, Francis
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p. 199 - 208
(2007/10/02)
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