Hydrothermal syntheses, and crystal structures of new lanthanide coordination polymers with nitrilotriacetic acid

Hydrothermal reactions of Nd(ClO4)(3)center dot 6H(2)O, Gd(ClO4)(3)center dot 6H(2)O and Er2O3 with H(3)NTA (nitrilotriacetic acid) afford three new lanthanide coordination polymers, {[Nd(NTA)(H2O)]center dot 2H(2)O}(n) (1), {[Gd(NTA)(H2O)]center dot 2H(2)O}(n) (2) and {[Er(NTA)(H2O)]center dot H2O} n (3), characterized by elemental analysis and IR spectroscopy. X-ray single crystal structural analyses showed that 1 and 2 are an isomorphous 2D-layered framework containing the nine-coordinated Nd(III) (or Gd(III)), and woven into a 3D suprastructure by interlayer hydrogen bonding while 3 is a 3D structure with eight-coordinate Er(III).