The crystal and molecular structure of diammine-(o-phthalato)copper(II)

Abstract

Diammine-(o-phthalato)copper(II), Cu(NH3)zCaH404, is monoclinic, P21/c: a=6"64 (1), b= 19-91 (1), c= 7"55 (1) A, fl= 109.9 (.1), Z= 4. The crystal structure has been determined from three-dimensional X-ray photographic data and refined by differential methods with anisotropic parameters to a final R value of 7"7%. The coordination around the metal atom is nearly square planar and involves two oxygen atoms from different phthalate ions and two nitrogen atoms from ammonia molecules [Cu-O 1-988 (5), 1.971 (5); Cu-N 1.992 (6), 1.997 (8) A]. Two more oxygen atoms, trans with respect to the coordination plane, make two long contacts [Cu-O 2.313 (5), 2.799 (5)/~] so the coordination polyhedron can be considered also a distorted bipyramid. Two of these bipyramids are coupled along an O-• • O edge and the couples are linked in chains by phthalate bridges. Both carboxyl groups are slightly rotated with respect to the benzene ring in the same direction. Packing is determined by a set of hydrogen bonds involving the nitrogen atoms from ammonia molecules and the oxygen atoms from the carboxyl groups.

Synthesis, structure and magnetic properties of cobalt(II) and copper(II) coordination polymers assembled by phthalate and 4-methylimidazole

“…The apical position is occupied by O(1) of the carboxylate group belonging to another Pht residue. The equatorial Cu-N (1.978(2), 1.981(2) Å ), Cu-O carboxylate (2.009(2) Å ) and Cu-O water (2.040(2) Å ) distances are in agreement with those observed in [Cu 2 (Pht) 2 (g-Pic) 4 (H 2 O)] n (Cu-N 1.985(7)-2.012(7), Cu-O 1.995(7)-2.053(5) Å [33]). The axial Cu(1)-O(1) distance of 2.353(2) Å is longer than that in the related complex (2.240(4) Å [33]).…”

“…180 C) and was then followed by a two-step total weight loss of 61.68% from 180 C to 300 C, which is due to the loss of two molecules of 4-MeIm and one molecule of phenyl radical [44] (calculated 58.63%). Further weight loss of 13.53%, corresponding to the elimination of two molecules of CO [45] (4) , whereas the cis angles range from 59.94 (3) to 110.04(4) ( Table 2). The main distortion from the octahedral geometry in the coordination polyhedron is due to the small angle O(3a)-Co(1)-O(4a) of 59.94 (3) at the chelate carboxylate group of the Pht ligand.…”

The crystal and molecular structure of carbonatodiamminecopper(II), Cu(NH3)2CO3

“…The Cu-N bond lengths of 1.971 (2) and 1.984 (2),~, are similar to the copper-ammine nitrogen distances found in sulfato and selenatotetraamminecopper(II) (Morosin, 1969), diammine-(o-phthalato)copper(lI) (Cingi, Guastini, Musatti & Nardelli, 1970), diazidodiamminecopper-(II) (Agrell, 1966), hexaamminecopper(II)chloride (Distler & Vaughan, 1967), di-/z-hydroxobis(dimethylamine)copper(II) sulfate monohydrate (Iitaka, Shimizu & Kwan, 1966), bis(ethylenediamine)copper(II) thiocyanate (Brown & Lingafelter, 1964), and nitrate (Komiyama & Lingafelter, 1964) as well as in other molecules, all of which fall in the range 1.97 to 2.07/~,. The Cu-O(1) and Cu-O(3) bond lengths of 1.986 (2) and 1.989 (2) A are within the range of 1.88 to 2.03 A found in monopyridinecopper acetate (Barclay & Kennard, 1961), copper acetate monohydrate (van , acetylactone-mono-(ohydroxyanil)copper(lI) (Barclay & Hoskins, 1965), azurite, CH3(OH)2(CO3) 2 (Gattow & Zemann, 1958), and other related molecules.…”

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

“…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.…”