Novel highly symmetrical class of lanthanide tetrakis-complexes Na(H_2O)4LnL_4 (HL -l,3-bis(l,3-dimethyl-lH-pyrazol-4-yl)-l,3-propandione) - synthesis, crystal structure and unique photophysical properties.

摘要

Tetrakis-complexes are the least of all studied among all lanthanide 1.3-diketonates1. In the same time peculiarities of they structures make them an attractive objects for investigation of photophysical, crystallographic and magnetic properties. Recently we have developed a general synthetic approach to 1.3-diketones, bearing pyrazole moiety2. One of these ligands - l,3-bis(l,3-dimethyl-lH-pyrazol-4-yl)-l,3-propandione appeared to be unique compound because of its complexation capability. Here we wish to report about new isostructural series of tetrakis-complexes based on this ligand and their unusual properties.