STRUCTURE AND SPECTRAL-LUMUINESCENT PROPERTIES OF LANTHANIDE-CONTAINING COMPLEXES WITH AZACROWN CALIXARENES

Lanthanide complexes with calix[4]arenes lower rim substituted with two azacrown ether fragments are reported. The size of the substituent cavity varied from 4 to 6 heteroatoms. The complexes were analyzed by means of IR, NMR, ESI mass spectroscopy. It is assumed that the coordination of Ln(III) ions occurs through the donor atoms of the lower rim; the counter anion and solvent molecule are also coordinated. Lanthanide-centered characteristic luminescence was observed in Eu(III), Tb(III) and Yb(III) complexes. The most efficient 4f-luminescence is observed for terbium-containing complexes with benzo-crown-derived ligands. The pathways of the sensitization of 4f-luminescence are discussed.

MONOLAYERS LENGMYUR AZAKRAUN-ESSENTIAL DERIVATIVES OF CALIXES[4]ARENA

In this work, aggregation behavior of azacrown-ether derivatives on a macrocyclic calix[4]arene scaffold within ultrathin Langmuir films on water subphase is considered.

(Z)-2-(4-{[(E)-2-Hydroxybenzylidene]amino}phenyl)-3-[4-(1,4,7,10-tetraoxa-13-azacyclopentadecan-13-yl)phenyl]acrylonitrile

The title compound, C32H35N3O5, is an important fluorescence probe. It is composed of a 1,4,7,10-tetraoxa-13λ2-azacyclopentadecane unit linked to a twisted (Z)-2-(4-{[(E)-2-hydroxybenzylidene]amino}phenyl)-3-phenylacrylonitrile chain. In the molecule, an O—H...N hydrogen bond forms an S(6) ring motif. There is also in intramolecular C—H...N hydrogen bond in the azacrown ether moiety, which also forms an S(6) ring motif. In the crystal, molecules are linked via pairs of C—H...O hydrogen bonds, forming inversion dimers.