Zinc(II) carboxylates with imidazole and 2-methylimidazole: unprecedented cyclic dimer and polynuclear coordination polymers based on bridging phthalate ions

Ni(II) coordination compounds based on mixed phthalate and aromatic amine ligands: synthesis, crystal structures and magnetic properties

“…Reaction of nickel(II) acetate with o-phthalic acid and excess of pyridine in water resulted in the high yield formation of [Ni(Pht)(Py) 2 [1,3,8,14,15,28] and carboxylate complexes [37][38][39]. The infrared spectra also show broad bands in the 3541-3071 cm À1 region, which can be assigned to water molecules.…”

“…In this case, the phthalate anion is a bidentate ligand and coordinates to metal ions by one oxygen atom from each of the carboxylate group. This structural motif of the ligand promotes the formation of polymeric structures such as were found in copper(II) [4][5][6][7][8][9], cobalt(II) [10][11][12], zinc(II) [13][14][15] and other metal complexes [16]. It is noteworthy that when the 1,6-bridging mode is realized, the other oxygen atoms from the same carboxylate groups are also able to coordinate additional metal ions resulting in supracage assemblies or complicated polymeric structures.…”

“…The good examples of the former are the fascinating Mn 18 [17,18] and Mn 10 [19] clusters reported by Christou et al as well as WinpennyÕs remarkable Ni 16 [20] and Co 13 [21,22] cages, which contain phthalate ligands displaying rare and unprecedented bridging modes. For the latter case, we can mention the coordination polymer [Zn(Pht)(2-MeIm)] n [15]. In this structure, one of a pair of zinc atoms is linked by 1,6-bridges of two phthalate ligands, while the other is held together through syn-syn bridging carboxylate groups in a 1,3-fashion from the same phthalates.…”

“…We have focused our efforts on synthesis and investigation of 3d coordination compounds based on mixed phthalate ligand and aromatic amines such as pyridine, imidazole and their derivatives and several interesting cobalt(II), copper(II) and zinc(II) [1,3,8,12,14,15] À1 ): 3209s,br, 1607vs, 1586sh, 1563vs, 1488s, 1449s, 1404vs, 1219m, 1153m, 1084w, 1072s, 1043s, 1015m, 951m, 932m, 887m, 812s, 761s, 698s, 656s, 636s, 592m, 577m. Single crystals suitable for diffraction studies were obtained from the mother liquid.…”

Crystal Structures and Spectroscopic Properties of Zinc(II) Ternary Complexes of Vitamin L, H&prime; and Their Isomer <i>m</i>-Aminobenzoic Acid with Bipyridine

“…21,22) Our study stems from the value of the zinc complexes containing carboxylate ligands. By far many Zn carboxylate complexes have been reported, [29][30][31][32][33][34][35][36] but rare is related about the aminobenzoic acid (AB). In the viewpoint of constructing functional compounds, we prepared several Zn(II) complexes involving some natural products such as o-aminobenzoic acid, Vitamin L (o-AB) and its isomers m-aminobenzoic acid (m-AB) and p-aminobenzoic acid, Vitamin HЈ (p-AB).…”