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Synthesis and un-isotherm kinetic study of some ferrocene acids

100%
Apreutesei D., Lisa G., Hurduc N., Scutaru D.
Open Chemistry
|
2004
|
vol. 2
|
issue 4
553-562
EN
The goal of this paper is to study thermal stability of some ferrocenes with acidic functional groups. Some other kinetic characteristics such as critical temperature and the rate constant corresponding to maximal degradation speed have been also evaluated. The type of functional units adjacent to the ferrocenyl unit determines thermal stability of ferrocene compounds. Groups with a powerful withdrawing effect determine a decreasing of the temperatures at which the material starts to lose weight. If a very long alkyl chain is connected to the ferrocene unit, a shielding effect in respect to the other carboxylic groups was observed, with an increase of the thermal stability.
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Synthesis and photochromic behavior of some azo-polysiloxanes modified with nucleobases or donor-acceptor groups

76%
Enea R., Resmeriţă A.-M., Petraru L., Grigoraş C., Scutaru D., Simionescu C., Hurduc N.
Open Chemistry
|
2007
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vol. 5
|
issue 4
981-995
EN
This paper presents the syntheses, characterization and photochromic behavior of some new azo-polysiloxanes modified with uracil, cytosine or nitro-phenolic groups. Taking into consideration the possibility of generating H-bonds or donor/acceptor interactions, this class of materials present a potential applicability in the immobilization of biomolecules and their nano-manipulations. Also, such compounds are capable of producing a fluid phase, with directional flowing capacity. For all these polymers, the molecular modeling simulations have shown disordered structures, which would generate amorphous phases, a very important aspect for molecules’ nano-manipulation. The photochromic behavior in the presence of UV irradiation was also evaluated. [...]
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