Self-assembly and structures of new lanthanide coordination polymers with 1,3-phenylenebis(oxy)diacetic acid

Abstract Seven Ln(III) coordination polymers, namely [Ln(PODA)(FA)(H 2 O)] n [Ln = La( 1 ), Ce( 2 ), Pr( 3 ), Nd( 4 ), Eu( 5 )] and [Ln(PODA) 1.5 (phen)] n [Ln = La( 6 ), Pr( 7 )] (H 2 PODA = 1,3-phenylenebis(oxy)diacetic acid, HFA = formic acid, phen = 1,10-phenanthroline) have been synthesized under hydrothermal conditions and characterized by IR spectroscopy, elemental analysis, single crystal X-ray crystallography, UV–Vis spectroscopy and powder X-ray diffraction analysis (PXRD). Structural analysis reveals that 1 – 5 are isostructural and exhibit 3-D frameworks with a (3 2 .4 2 .5 2 ) 2 (3 8 .4 20 .5 24 .6 14 ) topology, which comprise single- and quadruple-strand helical chains; while 6 and 7 show similar layer structures with a (4 4 .6 2 ) topology, however, they only consist of one kind of single-strand helical chain. In addition, the thermal stabilities of complexes 3 and 7 and the luminescent properties of complex 5 have been briefly investigated.