Thermal behaviors and adsorption properties of two Europium(III) complexes based on 2-(4-carboxyphenyl)imidazo[4,5-f]-1,10-phenanthroline.

Two Europium(III) complexes [Eu(NCP)(1,4-bdc)] n ·0.5H 2 O ( 1 ) and [Eu(NCP)(4,4′-bpdc)] n ·0.75H 2 O ( 2 ) (HNCP = 2-(4-carboxyphenyl)imidazo(4,5-f)-(1,10)phenanthroline, 1,4-H 2 bdc = benzene-1,4-dicarboxylic acid, 4,4′-H 2 bpdc = 4,4′-biphenyldicarboxylic acid) have been hydrothermally synthesized and characterized via elemental analysis, infrared spectrometry and single crystal X-ray diffraction. Structural analyses revealed that two complexes all exhibit three-dimensional network structures with a Schläfli symbol of 4 12 ·6 3 topologies. In addition, these two metal-organic frameworks present excellent thermal stabilities and the preferential adsorption of CO 2 over N 2 . [ABSTRACT FROM AUTHOR]