Syntheses, structures, photoluminescence, and magnetism of a series of discrete lanthanide complexes based on 2,5-dichlorobenzoate and 1,10-phenanthroline

The syntheses and crystal structures of eight lanthanide complexes with formula [Ln(2,5‐DCB)x(phen)y] are reported, which are characterized via single‐crystal, powder X‐ray diffraction, elemental analysis, IR spectroscopy, thermogravimetric analysis, photoluminescence measurement, and DC/AC magnetic measurement. These eight complexes are isostructural, and possess a discrete dinuclear structure. The adjacent dinuclear molecules are linked by the hydrogen bonding interactions into a one‐dimensional (1D) supramolecular chain. The neighboring 1D chains are further extended into a two‐dimensional (2D) supramolecular layer by the π-π stacking interactions. The photoluminescent properties of complexes 1 (Nd${}^{III}$), 2 (Sm${}^{III}$), 3 (Eu${}^{III}$), 5 (Tb${}^{III}$), 6 (Dy${}^{III}$), and 8 (Yb${}^{III}$) were investigated. Magnetic investigations also reveal the presence of ferromagnetic interactions in complexes 4 (Gd${}^{III}$), 6 (Dy${}^{III}$), and 7 (Er${}^{III}$). Additionally, complex 6 (Dy${}^{III}$) demonstrates field‐induced slow magnetic relaxation behavior. (© 2019 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)