SYNTHESIS AND CRYSTAL STRUCTURES OF EUROPIUM COMPLEXES WITH A STERICALLY HINDERED Ar BIG -BIAN LIGAND

The reduction of Ar BIG -bian (Ar BIG -bian = 1,2-bis[(2,6-dibenzhydryl-4-methylphenyl)-imino]acenaphthene) with an excess of metallic europium in dme and subsequent crystallization from a tmeda/thf mixture leads to the formation of an europium(II) complex [(Ar BIG -bian)Eu(thf) 2 ] ( 1 ) containing a diimine ligand dianion. As a result of the interaction of 1 with 0.5 molar equivalent of tetramethylthiuram disulfide in dme, the ligand is oxidized to the radical anion and the [(Ar BIG -bian)Eu{S 2 CNMe 2 }(dme)] dithiocarbamate derivative ( 2 ) is formed. The newly obtained compounds 1 and 2 are characterized by IR spectroscopy and elemental analysis. Molecular structures of the complexes are determined by XRD.