ABSTRACT
In the title compound, {[Tb(C(12)H(8)NO(2))(3)(H(2)O)(2)]·H(2)O}(n), the Tb(III) cation is in an eight-coordinate environment, ligated by six carboxylate O atoms from five 3-(pyridin-4-yl)benzoate (L) ligands and by two O atoms from water molecules. The cations are bridged by the carboxylate O atoms of the L ligands to form a two-stranded polymeric chain which is assembled into a three-dimensional supramolecular network through regular interchain O-H···N hydrogen bonding. On excitation at 320 nm, the title compound displays a series of emissions, which were assigned to the characteristic electronic transitions of Tb(III).
ABSTRACT
In the title compound, [Ni(C(9)H(6)N(3)O(3)S)(2)(H(2)O)(2)](n), the Ni(II) atom, located on an inversion center, is ligated in an octa-hedral geometry by two carboxyl-ate O atoms from two 2-{[5-(pyridin-4-yl)-1,3,4-oxadiazol-2-yl]sulfan-yl}acetate (L) ligands and two O atoms from water mol-ecules in the equatorial plane, and two pyridine N atoms from other two L ligands at the apical sites. Two L ligands bridge pairs of metal atoms in an anti-parallel manner, forming centrosymmetric dinuclear quasi-recta-ngular units which are linked into infinite double-stranded chains parallel to [100]. O-Hâ¯O hydrogen bonds between the coordinating water mol-ecules and the carboxyl-ate groups of the L ligand as well as interchain Sâ¯N inter-actions [2.726â (2)-3.363â (2)â Å] lead to the formation of a layer structure parallel to (001).
ABSTRACT
In the distorted W-shaped mol-ecule of the title compound, C(17)H(12)N(6)O(3)S(2), a twofold axis passes through the carbonyl group. The mol-ecules stack in the crystal through π-π inter-actions [centroid-centroid distance = 3.883â Å] and weak C-Hâ¯N hydrogen-bonding inter-actions, forming a three-dimensional architecture.
