Lanthanide Coordination Polymers Constructed from Dinuclear Building Blocks: Novel Structure Evolution from One-Dimensional Chains to Three-Dimensional Architectures

Abstract

A series of lanthanide coordination polymers [Ln(NIPH)(HNIPH)(phen)] [Ln = Tb ( 1 ), Ho ( 2 ), Er ( 3 ), La ( 4 ), Sm ( 5 )], [Ln 2 (NIPH) 3 (phen) 2 (H 2 O)]·(H 2 O) (Ln = Pr ( 6 ), Yb ( 7 ), [Ln 2 (NIPH) 3 (phen) 2 ] [Ln = Eu ( 8 ), Nd ( 9 )] (H 2 NIPH = 5-nitroisophthalic acid, phen = 1,10-phenanthroline) were hydrothermally synthesized and characterized by single-crystal X-ray diffraction. The frameworks constructed from dinuclear lanthanide building blocks exhibit three typical structure features: 1 − 3 possess one-dimensional double-stranded looplike chain structures, 4 − 7 have two-dimensional layer structure characteristics, 8 and 9 are the three-dimensional frameworks with pcu topology. In 1 − 9, NIPH ligands adopt multidentate coordination modes. The supramolecular architectures of 1 − 9 show that the presence of phen ligands and nitro groups on NIPH induced the formation of numerous hydrogen bonds. The luminescent and magnetic properties of 8 and 9 are investigated.