A NOVEL STRUCTURE-ANALYSIS METHOD FOR LAN THANIDE COMPLEX - NONE PARAMAGNETIC SHIFT TRI-LANTHANIDE MIXTURE METHOD

A new structure analysis method for lanthanide complexes was proposed, that is, none paramagnetic shift tri-lanthanide mixture method, It wa s found that the paramagnetic induced shift could be cancelled by mixi ng three kinds of paramagnetic lanthanide ions in appropriate proporti on. As a result, the chelating sites would he seen simplely from the h alf widths and the relative distances between lanthanide ion and the l igand nucleus could be calculated from the relaxation time (T-1) or th e half width. Care should be addressed that the analysis method is sui table for the systems in which intramolecular arrangements and intermo lecular ligand exchanges are relatively fasten NMR time scale used.