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Spectral-luminescent effects in heterometallic complexes of crown-porphyrins

“…A comparison of the emission spectra of the complexes with the spectra of the free ligands shows that the molecular luminescence intensity in the complexes decreases to 8-13%. These data confirm effective energy transfer from the organic chromophore moiety of the molecule to the lanthanide ion [15].…”

4f-Luminescence of ytterbium ions in the complexes with asymmetric porphyrins

“…The greatest influence of the nature of substituent is shown in nitrogen atom (q N 3 of pyrrol fragment) which is directly bounded with ␤-substituent. For meso-␤-substituted porphyrins these changes are greater as for P [1][2][3][4] . It is due to, probably, with greater deformation of porphyrin macrorings.…”

“…During 15 years we have investigated spectral-luminescent properties of lanthanide complexes with macrocyclic ligands (cryptands, crown-ethers, Schiff bases, 1,4,7,10-tetraazacyclododecane derivatives, calix[n]arenes, porphyrins) [1][2][3][4][5]. We would like to outline perspectives first of all porphyrins as luminescent sensors in near IR-region because they can form stable complexes with lanthanide ions and have high absorbance [6].…”

Synthesis, isolation, and redispersion of resorcinarene-capped anatase TiO2 nanoparticles in nonaqueous solvents

“…3). The bands in the region of 250-350 nm can be attributed to the transitions in the aromatic groups; the band at 618 nm can be attributed to the formation of intramolecular hydrogen bonding between the hydroxyl groups of resorcinol rings as a result of the essential redistribution of electron density takes place, causing the delocalization of π -electrons through H-bridges [46]. Thus, the effect of bonding of C 11 -resorcinarene to TiO 2 nanoparticles was studied on photoluminescence upon excitation at 308 nm.…”