Rare earth metal squarates incorporating ethylene glycol ligand with a three-dimensional framework structure: RE(C(4)O(4))(1.5)(C(2)H(6)O(2)) (RE = Y, La-Nd, Sm-Lu).
Fifteen isostructural rare earth metal squarates incorporating ethylene glycol ligand with the formula RE(C(4)O(4))(1.5)(C(2)H(6)O(2)) (RE = Y, La-Nd, Sm-Lu) have been synthesized under hydrothermal conditions and structurally characterized by single-crystal and powder X-ray diffraction, (13)C CPMAS NMR, absorption spectroscopy, and magnetic susceptibility. A variable-temperature in situ powder X-ray diffraction study on the Ce compound was also performed to determine its thermal stability. Each RE(3+) cation in the structure is bonded to six squarate anions and one neutral ethylene glycol chelate, and each C(4)O(4)(2-) anion coordinates to four RE(3+) cations such that a new 3-D framework is formed. They are the first examples of organic-inorganic hybrids which contain both squarate and ethylene glycol ligands.
Liu
Yen-Shen
YS
Department of Chemistry, National Central University, Chungli, Taiwan.
Tang
Ming-Feng
MF
Lii
Kwang-Hwa
KH