Reactions between 4 0 -phenyl-terpyridine (L) and several Zn(II) salts (trifluoromethane sulfonate, 5) and [Zn(m-OCOPhOH) 2 L] (6), which were characterized by elemental analysis, 1 H NMR, 13 C NMR, IR, single crystal X-ray diffraction and fluorescence spectroscopies. In 1, the Zn atom is hexacoordinated, with a N 3 O 3 coordination environment, whereas in the remaining structures the metal atom is envisaged as possessing distorted N 3 O 2 irregular trigonal bipyramidal coordination geometries. All the compounds show interesting photo-luminescent properties in solid and solution states in DMF, DMSO and methanol, which are reported along with their TG-DTA thermal decomposition processes.

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The title compound, [ZnCl2(C21H15N3)], was obtained from the reaction of ZnCl2·4H2O with 4′-phenyl­terpyridine (L) and disodium 2,6-dipicolinate. The Zn2+ cation is ligated by the N atoms of the tridentate L ligand and two chloride anions, forming a ZnN3Cl2 polyhedron with a distorted trigonal–bipyramidal coordination geometry. In the crystal, nonclassical C—H⋯Cl hydrogen bonds are observed.

Key indicators: single-crystal X-ray study; T = 298 K; mean (C-C) = 0.002 Å; R factor = 0.023; wR factor = 0.067; data-to-parameter ratio = 19.7.The title salt, [K 2 (C 16 H 12 O 6 )] n , was obtained by the reaction of 1,2-bis[4-(ethyl-carboxyl)-phenoxyl]ethane with KOH in water. The anion lies on a crystallographic inversion center, which is located at the mid-point of the central C-C bond. The K + cation is coordinated by six O atoms, two from the chelating carboxylate group of the anion and four from four neighboring and monodentately binding anions, giving rise to an irregular [KO 6 ] coordination polyhedron. The coordination mode of the cation leads to the formation of K/O layers parallel to (100). These layers are linked by the nearly coplanar anions (r.m.s. deviation of 0.064 Å of the carboxyl, aryl and O-CH 2 groups from the least-squares plane) into a three-dimentional network. Related literature