Wyniki wyszukiwania - BazTech

1

Nowe azometiny jako składnik organicznych struktur fotowoltaicznych

Nowak E. M., Siwy M., Schab-Balcerzak E.

Journal of Education and Technical Sciences

|

2015

|

Vol. 2, nr 1

24--26

PL

W ciągu ostatnich lat rośnie zainteresowanie fotowoltaiką opartą o związki organiczne (OPV – organic photovoltaic). Na szeroką skalę poszukiwane są substancje, których budowa chemiczna i właściwości fizyczne pozwalałyby na uzyskanie wydajnych ogniw słonecznych. W pracy zbadano możliwości fotowoltaiczne nowych związków z grupy azometin. Wykonano urządzenia fotowoltaiczne dla różnych rodzajów warstwy aktywnej. Urządzenia działały na zasadzie heterozłącza objętościowego (BHJ – bulk heterojunction) i składały się z wielu bardzo cienkich warstw (rzędu 100 nm). Wykorzystano polimerowe związki wykazujące duże przewodnictwo elektryczne tj. politiofeny (P3HT i P3OT) oraz PEDOT:PSS. Zbadano i wyznaczono parametry charakteryzujące układ fotowoltaiczny tj. prąd zwarcia JSC, napięcie obwodu otwartego VOC, współczynnik wypełnienia FF oraz współczynnik konwersji. Zbadano dwie nowe zasady Schiffa uzyskując wydajności z przedziału 0.107-0.193%.

2

Electro-optic activity of an azopolymer achieved via poling with the aid of silicon nitride insulating layer

Kozanecka-Szmigiel A., Szmigiel D., Switkowski K., Schab-Balcerzak E., Siwy M.

Optica Applicata

|

2011

|

Vol. 41, nr 3

777--785

EN

Nonlinear optical chromophore was synthesized to form a guest-host system with a PMMA matrix. Thin polymer films were spin-coated onto the substrates containing an additional insulating layer. The layer material was high resistivity and high transmittance silicon nitride obtained by chemical vapour deposition with plasma enhancement at a relatively low temperature of 150 °C. The presence of the nitride layer allowed for performing the polymer poling in the range of high electric field strengths not attained in structures without the insulating layer. Here, for the first time to the best of our knowledge, the silicon nitride interlayer was used in the poling process.

3

Silver Ion Complexes with Macrocyclic Compounds Build on the Basis of Cyclotriphosphazene Ring

Seliger P., Andrijewski G., Siwy M., Sęk D.

Polish Journal of Chemistry

|

2009

|

Vol. 83, nr 4

581-588

EN

The new diethanethiol-dipyrrolidinyl PNP-lar iat ether, L2, was syn the sized. Spectral properties of the tetrapyrrolidinyl PNP-lar iat ether L1 as well as L2 and their complexes with silver cat ion were investigated. The formation constants of the complexes with Ag+ in methanol solutions were determined. The 1H NMR and potentiometric measurements in dicate that in both cases complexation of Ag+ ions pro ceeds with participation of endocyclic nitrogen atom of cyclophosphazene ring and of polyether oxygen donors. In the case of L2 there is no evidence for stabilization of the ob tained complex by ethanethiol sub units attached to the exocyclic P atom. There is also no evidence for additional stabilization by cyclophosphazene ring or any of the pyrrolidinyl groups.

4

Studies on azobenzene chromophores content and its localization in functionalized poly(esterimide)s

Wanic A., Siwy M., Schab-Balcerzak E.

Polish Journal of Applied Chemistry

|

2009

|

Vol. 53, nr 4

277-294

EN

In this article determination of azobenzene chromophore content in poly(esterimide)s by 13C NMR spectroscopy was reported for the first time. Azopolymers were obtained by a posf-azo-coupling reaction. The chemical shifts of carbon atoms signal characteristic for evaluation of chromophores load level in polymers were established based on analysis of several proper compounds. It was found that the most important for such analysis are the ranges 147-155 ppm and 112-116 ppm in 13C NMR spectrum. The calculated degree of poly(estrimide)s dye functionalization was compared with results estimated from UV-Vis spectroscopy and were in good agreement. The obtained results led to conclusion that 13C NMR spectroscopy is useful tool for determination chromophore content and moreover its localization in polymer. The elaborated method could be applied not only for polymers investigated in this work but also for all polyimides functionalized by azobenzene derivatives.

5

Badania nad pochodnymi korono-cyklofosfazenu o skojarzonym działaniu cytostatycznym

Brandt K., Porwolik-Czomperlik I., Siwy M., Sęk D.

Prace Naukowe Instytutu Technologii Organicznej i Tworzyw Sztucznych Politechniki Wrocławskiej. Konferencje

|

2003

|

Vol. 52, nr 25

354-356

PL

Dążenie do zwiększenia selektywności działania preparatów antynowotworowych oraz przeciwdziałanie uodparnianiu się komórek nowotworowych na stosowany lek jest jednym z głównych celów chemoterapii. Szczególnie istotne jest projektowanie i synteza związków zdolnych do skojarzonego działania antynowotworowego w ramach jednej cząsteczki tj. zawierających w swojej strukturze ugrupowania zdolne do różnego rodzaju odziaływań z DNA. Celem tej pracy jest synteza pochodnych korono-cyklofosfazenu zawierających zarówno grupy zdolne do alkilowania DNA, jak i również interkalatory DNA.

EN

Two groups of cyclophosphazene crown derivatives i.e one having four substituents with alkylation function and the second bearing one substituent with intercalation and three with alkylation functions have been syntherized and characterized. A preliminary study of some derivatives carried out in vitro showed their cytostatic activity.

6

Od oddziaływań supramolekularnych do molekularnych

Brandt K., Siwy M., Lach D.

Wiadomości Chemiczne

|

2000

|

[Z] 54, 5-6

389-434

EN

The review is focused on the problems of supramolecular assistance to molecular synthesis which means the employment of supramolecular interactions to control the chemical synthesis, i.e. to guide the regio- and/or stereoselective formation of covalent and/or mechanic bonds. Such an approach results from the tendency to mimic processes occurring in natural biological systems. The special attention is focused on the recent achievements in this field, i.e. on the design of so-called intelligent substrates, which contain in their structure the requisite stereoelectronic information needed to self-assemble spontaneously into a supramolecular intermediate, which converts further into a desired final product after the formation of one or more covalent bonds. Among the unusual structures obtained using this synthetic paradigm, mechanically interlocked molecular compounds, i.e. rotaxanes, catenanes and their supramolecular precursors: psedorotaxanes, are described in more detail, as they display features of bistable chemical switches, and therefore evolve currently a great scientific interest due to their prospective applications in nanotechnologies. Several examples have been given of supramolecular assistance to other complex chemical syntheses, in particular of organic compounds, organo(cyclophosphazenes) and oligonucleotides, enabling to perform them quickly and selectively from polyfunctional reagents, without the necessity to use any protecting groups. It has been emphasized that supramolecular interactions play a special role in guiding so-called self-replication processes of the molecules containing in their structure both reactive groups, able to undergo co-condensation, and complementary to those contained in the substrates supramolecular synthons (motifs), capable to form appropriately oriented ternary complexes with these substrates, in which the functional groups are in favourable position to interact towards the desired product. An influence of spontaneous self-assembly of the substrates, preceding their linking via covalent bond(s), on regio- and stereochemistry of the occurring processes has been discussed, with the special attention being paid to the role of so-called templates (previously named matrices), determining the orientation of the substrates due to the stabilization of particular transition states. Several types of templates have been discussed: complementary hydrogen bonding, metal cations (alkali metal, transition metal), p-donor-p-acceptor interactions and various combinations of the above mentioned; the examples of the respective template-driven syntheses have been quoted. The reactions of functional macrocyclic ligands, assisted by supramolecular interactions with the nucleophilic ion-paired co-reagents, have been only briefly mentioned and limited to the examples of the exchange reactions of benzo-crowns with substituents in aromatic rings, and of chlorocyclophosphazene-crowns.