Aqua-trinitrato[2,4,6-tris-(pyridin-2-yl)-1,3,5-triazine]neodymium(III) dihydrate.

In the title compound, [Nd(NO(3))(3)(C(18)H(12)N(6))(H(2)O)]·2H(2)O, the Nd(3+) ion is in a distorted bicapped square-anti-prismatic geometry formed by three N atoms from the 2,4,6-tris-(pyridin-2-yl)-1,3,5-triazine (TPTZ) ligand, six O atoms from the three nitrate anions and one O atom from the aqua ligand. The mol-ecules are linked by O-H⋯O and O-H⋯N hydrogen bonds. Two types of π-π stacking inter-actions occur between the TPTZ ligands of adjacent complexes [centroid-to-centroid distances = 3.760 (4) and 3.870 (3) Å].

µ-Adipato-bis-[chlorido(2,2':6',2''-terpyridine)-copper(II)] tetra-hydrate.

In the title compound, [Cu(2)(C(6)H(8)O(4))Cl(2)(C(15)H(11)N(3))(2)]·4H(2)O, the dinuclear copper complex is located on a crystallographic inversion centre. Each Cu atom is in a distorted square-pyramidal coordination environment, with one O atom of an adipate dianion and three N atoms from the 2,2':6',2''-terpyridine ligand occupying the basal plane, and one chlorine in the apical site. In addition, there is weak Cu-O inter-action opposite of the chlorine with a distance of 2.768 (1) Å. The adipate ligand adopts a gauche-anti-gauche conformation. The inter-stitial water mol-ecules form hydrogen-bonded tertramers that are connected to the complexes via O-H⋯O and O-H⋯Cl hydrogen bonds, thus leading to the formation of tightly hydrogen-bonded layers extending perpendicular to the b-axis direction.

Poly[[tetra-aqua-bis[µ(4)-2,2'-(p-phenyl-ene-di-oxy)diacetato][µ(2)-2,2'-(p-phenyl-ene-di-oxy)diacetato]dierbium(III)] hexa-hydrate].

The asymmetric unit of the title compound, [Er(2)(C(10)H(8)O(6))(3)(H(2)O)(4)]·6H(2)O, comprises one Er(3+) ion, one and a half 2,2'-(p-phenyl-enedi-oxy)diacetate (hqda) ligands, two coordinated water mol-ecules and three uncoordinated water mol-ecules. The Er(3+) ion is nine-coordinated by seven O atoms from hqda ligands and two O atoms from water mol-ecules. In the title compound, there are two types of crystallographically independent ligands: one with an inversion center in the middle of the ligand is chelating on both ends of the ligand towards each one Er center; the other hqda ligands are bridging-chelating on one side, and bridging on the other end of the ligand. Two adjacent Er(3+) ions are thus chelated and bridged by -COO groups from hqda ligands in three coordination modes (briding-chelating, bridging and chelating). These building blocks are linked by OOC-CH(2)O-C(6)H(4)-OCH(2)-COO spacers, forming two-dimensional neutral layers. Adjacent layers are linked by O-H⋯O hydrogen-bonding inter-actions, forming a three-dimensional supermolecular network.

catena-Poly[diaqua-tris(µ(3)-biphenyl-2,2-dicarboxyl-ato)disamarium(III)].

The title compound, [Sm(2)(C(14)H(8)O(4))(3)(H(2)O)(2)](n), is composed of one-dimensional chains and is isostructural with previously reported compounds [Wang et al. (2003 ▶). Eur. J. Inorg. Chem. pp. 1355-1360]. The asymmetric unit contains two Sm atoms, each of which lies on a crystallographic twofold axis. Both crystallographically independent Sm atoms are coordinated by eight O atoms in a distorted dodeca-hedral arrangement. The polymeric chains run along [001]. Adjacent chains are connected through π-π inter-actions [centroid-centroid distance = 3.450 (2) Å], forming a two-dimensional supra-molecular network.