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Dalton Transactions

The international journal for inorganic, organometallic and bioinorganic chemistry



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Dalton Trans., 2009, 9781 - 9786, DOI: 10.1039/b911962k

Rare earth metal squarates incorporating ethylene glycol ligand with a three-dimensional framework structure: RE(C4O4)1.5(C2H6O2) (RE = Y, La–Nd, Sm–Lu)

Yen-Shen Liu, Ming-Feng Tang and Kwang-Hwa Lii

Fifteen isostructural rare earth metal squarates incorporating ethylene glycol ligand with the formula RE(C4O4)1.5(C2H6O2) (RE = Y, La–Nd, Sm–Lu) have been synthesized under hydrothermal conditions and structurally characterized by single-crystal and powder X-ray diffraction, 13C 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 RE3+ cation in the structure is bonded to six squarate anions and one neutral ethylene glycol chelate, and each C4O42- anion coordinates to four RE3+ 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.

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