121.
Six lanthanide compounds [Ln(H
2O)
9](
m-BDTH)
3·9(H
2O) where Ln = La (
1), and [Ln(H
2O)
8](
m-BDTH)
3·9(H
2O) (
m-BDTH
2 = 1,3-benzeneditetrazol-5-yl) where Ln = Lu (
2), Yb (
3), Er (
4), Ho (
5) and Y (
6) were hydrothermally synthesized and characterized by elemental analyses, infrared spectra, powder X-ray diffraction (PXRD) and X-ray single crystal diffraction. PXRD indicates that
2–
6 are isomorphous. Structural analyses reveal that
1 is coordinated by nine water molecules forming a capped-square antiprism, while
2–
6 are coordinated by eight water molecules forming a simple square antiprismatic geometry. Effects of water molecules on thermal stability were also discussed by thermogravimetric (TG), DSC, and PXRD under different temperatures. TG analyses suggest that
1 loses lattice and coordinated water molecules with no diacritical boundary, and
6 removes lattice water molecules first and then coordinated water molecules. DSC and PXRD further confirm the consequence.
相似文献