Designs, Syntheses, Structures And Properties Of Rare Earth Complexes Of Dihydrazone Ligands

Isonicotinoyl hydrazine, salicyloyl hydrazine and 2,3-butanedione were used to synthesise rare earth bis-Schiff base complexs in this dissertation. Three new complexes were finally synthesized and structurally characterized.(1) A crystalline complex [(LaL)(NO₃)₃(CH₃CH₂OH)]·(CH₃CH₂OH)₃ was synthesized by reaction of 2,3-butanedione, isonicotinoyl hydrazine and La(NO₃)₃·6H₂O in CH₃CH₂OH. The complex was characterized by IR and UV spectral methods and X-ray single crystal diffraction.(2) Two crystalline complexs were synthesized by reaction of 2,3-butanedione, salicyloyl hydrazine and La(NO₃)₃·6H₂O or Ce(NO₃)₃·6H₂O in CH₃CH₂OH. The complexes were characterized both by IR and UV spectral methods and X-ray single crystal diffraction.The above comlexes are similar in structures and properties. They were eleven-coordinate. This coordination number is higher than ordinary ones of 8 or 9. This can be attributed to the characteristics of the dihydrazone ligands.