Synthesis and properties of a new nanomaterial based on copper octacarboxyphthalocyaninate

Russian Journal of Physical Chemistry A - A new, highly ordered nanomaterial containing copper phthalocyaninate as the main structural unit is prepared via the interaction between copper...     

Bistability of self-modulation of the GaAs intrinsic stimulated picosecond radiation spectrum

The bistability of self-modulation of the spectrum of the stimulated picosecond radiation that appears during picosecond optical pumping of GaAs is detected. The radiation is measured before it reaches the end faces of a sample. One set of equidistant modes occurs in the radiation spectrum at the radiation pulse front. A set of modes located at the center between the initial modes replaces the first set in the descending radiation branch. The intermode interval inside each set coincides with the calculated interval between the eigenmodes of the GaAs layer, which is an active cavity. The radiation rise time turns out to be an oscillating function of the photon energy. The spectrum evolution is self-consistent so that the time-integrated spectrum and the spectrum-integrated radiation pulse envelope have a smooth (without local singularities) shape. The revealed bistability explains the physical nature of the two radiation-induced states of population depletion between which subterahertz self-oscillations in the radiation field were detected earlier. The radiation spectrum self-modulation is assumed to be a variant of stimulated Raman scattering.     

Synthesis of <Emphasis Type="Italic">meso</Emphasis>-phenyl-substituted porphyrins as starting compounds for the preparation of porphyrin-containing polymers

Data on the synthesis of symmetrical and unsymmetrical meso-phenyl-substituted porphyrins, which are building blocks for porphyrin-based polymers of different structure, are analyzed. Methods for the porphyrin ring construction and modification by active functional groups for further immobilization onto a polymer or preparation of porphyrin monomers are considered. Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 4, pp. 680–703, April, 2007.     

Immobilization of tetraphenylporphyn and its metallocomplexes on the surface of plasma-treated polypropylene

The immobilization of 5,10,15,20-tetraphenylporphyn and its zinc and manganese complexes on the surface of polypropylene modified by plasmachemical treatment and subsequent grafting copolymerization of acrylamide or 4-vinylpyridine has been studied by multiple attenuated total reflection FTIR spectroscopy, electronic absorption spectroscopy, and atomic force microscopy. It has been demonstrated that the immobilized molecules of tetraphenylporphyn and its metallocomplexes are active in the photosensitized generation of singlet oxygen to the gas phase.