The construction of two lanthanide coordination polymers based on 5-hydroxyisophthalate and bipyridine

Two lanthanide coordination polymers, [Tm-2(5-IPA)(4)(2,2-Hbipy)(2)]3H2O (1, 5-H(2)IPA=5-hydroxyisophthalic acid, 2,2-bipy=2,2-bipyridine) and [Er(5-HIPA)(3)(4,4-bipy)(3)(H2O)(2)]3H2O (2, 4,4-bipy=4,4-bipyridine), have formed by hydrothermal synthesis. Complex 1 exhibits a 2-D coordination network containing parallelepiped-shaped voids occupied by guest 22-bipy molecules. Complex 2 possesses a 1-D linear chain structure. The 1-D chains are linked by 4,4-bipy molecules to form a 3-D supramolecular framework. IR spectroscopy, elemental analysis, and thermogravimetric analysis were also investigated.