Studies of Radii‐Dependent Lanthanide Coordination Behavior with 4‐Acetamidobenzoate and 1,10‐Phenanthroline

Abstract

AbstractA series of new lanthanide complexes [Ln(aba)3(Haba)(phen)2(H2O)] [Ln = La, (1), Pr (2), and Nd (3)] and [Ln2(aba)4(phen)2(NO3)2]·2C2H5OH [Ln = Eu (4) and Er (5)] (aba = 4‐acetamidobenzoate; phen = 1,10‐phenanthroline) were synthesized by solvothermal reaction and characterized by single‐crystal X‐ray diffraction analysis, IR spectra, and thermal analysis. These complexes exhibit two typical structure features attributed to the lanthanide contraction effect: complexes 1–3 possess one‐dimensional chain structures linked by intermolecular hydrogen bonds between the mononuclear units, and 4 and 5 have two‐dimensional layer structures, which are formed by intermolecular hydrogen bonds between the dinuclear units. The aba molecules adopt four coordination modes in these complexes. Furthermore, the luminescent properties of complex 4 in the solid state were investigated at room temperature.