Isomeric phthalonitriles having four terminal cyano-groups are synthesized by means of nucleophilic replacement of 4-nitrophthalonitrile's nitro-group with resorcinol and hydroquinone fragments. ...Corresponding phthalocyaninates of cobalt, zinc, nickel and copper are obtained based on the compounds. The synthesized metal phthalocyaninates are studied in terms of spectroscopic properties using various organic solvents and additionally organic bases. Synthesized cobalt and zinc phthalocyaninates are found to form stable sandwich-type dimers while reacting with 1,4-diazabicyclo2.2.2octane (DABCO). Phthalocyaninates having substituted para-positions form more stable sandwich-type agregates than meta-substituted ones. A stability of molecular complexes of 1:1 composition obeys the following order: Py < Pz < DABCO for all synthesized phthalocyaninates.
Display omitted
•d-metal cyanophenoxy-phthalocyaninates were synthesized and characterized.•Extra-coordination leads to formation of aggregates close to J- and H- types.•Fluorescence quantum yields increase under the aggregation processes were found.•Cobalt complexes accelerate DTC oxidation reaction up to 19 times.
The possibility of obtaining eutectic binary nematic liquid crystal systems containing lanthanide mesogens was studied. As lanthanide mesogens, we used lanthanide(III) tris-(β-diketonate) adducts ...exhibiting nematic mesomorphism. The luminescence of the compositions containing Eu(III) adducts was investigated.
Shaped single crystal growth and scintillation properties of Bi:Gd3Ga5O12 Novoselov, A.; Yoshikawa, A.; Nikl, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2005, Letnik:
537, Številka:
1-2
Journal Article
Recenzirano
Shaped single crystals of Bi:Gd3Ga5O12 (Bi=0.102, 0.126 and 0.141%) were grown by the modified micro-pulling-down method. Strong evaporation of Bi during single crystal growth leading to lower ...concentration in the obtained crystals was detected. Measured optical absorption spectra show an absorption band round 290nm ascribed to the lowest energy 6s2→6s6p transition of Bi3+. In the radioluminescence spectra in the region of 440–560nm an emission composed of two bands and depending on Bi concentration was found and completed by the decay kinetics measurements. Unsuitability of Bi-doping in the Gd3Ga5O12 host to get energy transfer from Gd3+ towards Bi3+ centers was concluded.
