Crystal structures, magnetic and photoluminescent properties of one-dimensional lanthanide complexes with picolinate ligand

Two novel lanthanide picolinate complexes [Ln(pic)3](Ln = Nd(1) and Sm(2); Hpic = picolinic acid) were prepared by hydrothermal method. The results of an X-ray crystallographic analysis reveal that both of complexes are unique tris-carboxylato-bridged one-dimensional chain structures. This 1D chain consists of one zigzag strand and two helical strands formed by oxygen atoms of the carboxylato groups and metal ions. The luminescence properties of complex 2 show the characteristic transition of the Sm(III). The magnetic properties of complexes 1 and 2 also have been studied.