부산대학교 도서관

The series of isostructural lanthanide coordination polymers with the empirical formula [Ln(PDA)(HO)]·2HO, where PDA = 1,4-phenylenediacetate anion = [CH(COO)]; Ln = La-Lu(III), and Y(III) were produced in the reaction of LnCl· nHO with ammonium salt of 1,4-phenylenediacetic acid in water solution. The compounds were characterised structurally using powder X-ray diffraction, elemental and thermogravimetric analyses as well as FT-IR spectroscopy. Thermogravimetric analyses show that in the range 60-170 °C the dehydration process occurs. The thermal stability of dehydrated compounds, Ln(PDA) increased from about 200-350 °C in the whole series of complexes. Single-crystal X-ray diffraction analysis for the Gd(III) complex revealed that the compound crystallizes in the monoclinic P2/ c space group with a = 21.863(2) Å, b = 10.035(1) Å, c = 13.854(1) Å, β = 91.53(1)° and V = 3,038.5(4) Å. The complex contains one-dimensional gadolinium-carboxylato chains, which are connected with the -CH-CH-CH- spacers of PDA ligand to the three-dimensional metal-organic framework. [ABSTRACT FROM AUTHOR]