Sharif, S.Zaheer, S.Mumtaz, M. W.Sahin, O.Ahmad, S.Zulfiqar, S.Adnan, A.2025-03-232025-03-2320211070-32841608-3318https://doi.org/10.1134/S1070328420120076https://hdl.handle.net/11486/5321Two new complexes of gadolinium(III) and erbium(III) with pyridine-2,6-dicarboxylic acid (H(2)Pydc),{Na-3[Gd(Pydc)(3)]center dot 2H(2)O}(n) (I) and [Er(HPydc)(3)]center dot 10H(2)O (II), were prepared and their crystal structures were determined by X-ray crystallography (CIF files CCDC nos. 940633 (I) and 872068 (II)). The gadolinium atom in I is nine-coordinate (GdN3O6) and exhibits a tricapped trigonal prismatic geometry having 14 triangular faces. The Pydc ligand adopts chelating and, mu(3)- and mu(5)-bridging coordination modes. The 1D chains are further joined by Na atoms to generate a 3D coordination polymer. The structure is additionally stabilized by H-bonding. The Erbium polyhedron in II is also a tricapped trigonal prism (ErN3O6). The HPydc anions in II behave as tridentate chelating ligands. The complex molecules are connected to each other through hydrogen bonding interactions to form a three-dimensional network. Fluorescence titration experiments for complex II displayed highly sensitive fluorescence quenching efficiency of 98.3% against picric acid.eninfo:eu-repo/semantics/closedAccessgadolinium(III)erbium(III)pyridine-26-dicarboxylatecrystal structurefluorescence quenchingArticle4719510410.1134/S10703284201200762-s2.0-85100838721Q3WOS:000617822200013Q4