SYNTHESES AND CRYSTAL STRUCTURES OF [M(NO3)(2)(TPEN)][NO3]CENTER-DOT-3H(2)O (M=LA, TB), RARE EARTH COMPLEXES WITH STRONG M-N BONDS

摘要

The compounds [M(NO3)(2)(tpen)][NO3]. 3H(2)O with M = La, Nd, Eu, To and Y have been synthesized. Single crystals have been grown of the compounds with M=La and Tb from water-ethanol solution. Their crystal structures have been determined, The compounds are isostructural; the metals are ten-fold coordinated, with six nitrogens from one tpen ligand and four oxygens from two nitrates. Growth of crystals with nitrogen coordinated to rare earths in water-containing solution is unusual and indicates that tpen is a good nitrogen donor even with hard cations. [References: 25]