A series of lanthanide complexes with different N-donor ligands: synthesis, structures, thermal properties and luminescence behaviors. Issue 75 (26th July 2016) - Wang, Ye
Abstract : Complexes1 and2 are stitched together via Cl–π and hydrogen bonding interactions to form 1D, 2D, 3D supramolecular structures, while complexes3 and4 are packed together by Cl–Cl, π–π, and hydrogen bonding interactions to form 1D, 2D structures. Abstract : Four novel lanthanide complexes, [Ln(2, 4-DClBA)3 (terpy)(H2 O)]·H2 O (Ln = Eu(1), Tb(2)); [Ln(2, 4-DClBA)3 (5, 5′-DM-2, 2′-bipy)(C2 H5 OH)]2 (Ln = Eu(3), Tb(4); 2, 4-DClBA: 2, 4-dichlorobenzoate; terpy: 2, 2′:6′, 2′′-terpyridine; 5, 5′-DM-2, 2′-bipy: 5, 5′-dimethyl-2, 2′-bipyridine) have been synthesized via a conventional solution method at room temperature and structurally characterized by single crystal and powder X-ray diffraction. Complexes1–2 exhibit mononuclear lanthanide architectures and each Ln 3+ ion is nine-coordinated adopting a distorted monocapped square antiprismatic molecular geometry, while complexes3–4 exhibit binuclear lanthanide architectures in which each Ln 3+ ion is eight-coordinated adopting a distorted square antiprismatic molecular geometry. Mononuclear complexes1–2 are stitched together via Cl–π and hydrogen bonding interactions to form the 1D, 2D, 3D supramolecular structures. While complexes3–4 are packed together through Cl–Cl, π–π, and hydrogen bonding interactions to form 1D, 2D supramolecular structures. Luminescence investigation reveals that complexes1, 3 and2, 4 display strong red and green emission respectively, showing that terpy and 5, 5′-DM-2, 2′-bipy can act as sensitizing chromophores, but the former is more effective. The IR, TG-DTG, and the heat capacities of complexes1–4 were also measured.