Filiz Ercan

Synthesis and Crystal Structure of Linear Chain Homotetranuclear Complexes with N3

Mononuclear copper(II) complexes, Cu(L) [N,N′‐bis(salicylidene)‐1,3‐propanediaminato]copper(II), and Cu(LDM) [N,N′‐bis(salicylidene)‐2,2′‐dimethyl‐1,3‐propanediaminato]copper(II), were prepared from the ONNO type ligands N,N′‐bis(salicylidene)‐1,3‐diaminopropane (H2L) and N,N′‐bis(salicylidene)‐2,2′‐dimethyl‐1,3‐diaminopropane (H2LDM). These mononuclear complexes were transformed into tetranuclear complexes, [(S)Cu(L)Cu(N3)2]2 and [(S)Cu(LDM)Cu(N3)2]2 (S are solvent molecules, DMSO, DMF, THF, dioxan), with N3 ‐ and Cu(II) ions. All complexes were characterized by elemental analyses and IR spectroscopy. A molecular model of the complex [(DMSO)Cu(L)Cu(N3)2] was obtained by single crystal x‐ray diffraction methods.

Synthesis and crystal structure of two dimeric cadmium(II) complexes bonded with pseudohalides, 1.1 and 1.3 bonding

Abstract Two different complexes were obtained from (dmpp) and Cd(II) ions with the aid of pseudohalide ions in non-aqueous solvents. The dinuclear complex formed with thiocyanate ions show, using XRD, to posses two 1.3 bond μ bridges [CdL(SCN)2]2. The other dinuclear complex was also seen to form with cyanate ions but with the μ-bridge in a 1.1 position [CdL(OCN)2]. All Cd atoms are located in a distorted octahedral environment in 1 and 2 complexes. The Cd…Cda distances are 6.032(4) Å in 1 and 3.704(3) Å in 2, respectively. The N—C—S and O—C—N angles are approximately linear as 178.1(3) and 178.6(3)° in 1 and 177.2(5) and 176.9(7)° in 2, respectively. The Cd—(μN,S-NCS)2—Cda bonds form a zig-zag structure in 1 and the Cd—(μO,N-OCN)2—Cda bonds form a distorted square planar in 2.

Some DI- and Trinuclear Zinc Complexes: Anion Induced Complex Formation

Abstract Complexes of N,N′-bis(salicylidene)-1,3-diaminopropane, an ONNO type ligand, with ZnX2 (X = AcO−, NO3-, Cl−, Br−, I−) salts were prepared. Molecular structures of these complexes were identified using elemental analyses, IR spectrometry and X-ray diffraction techniques. It has been observed that the reactions between zinc ions and the said ligand tend to produce polynuclear complexes and depending on the anion present either di- or trinuclear complexes are formed. Thus, it can be deduced from the results presented in this article that trinuclear complexes form when the zinc salt used was the acetate or nitrate and dinuclear complexes form if the anion in the zinc salt is a halogen.

Synthesis and crystal structure of a homotrinuclear Ni(II) complex

Abstract A tetradentate ONNO type Schiff base was synthesized from salicyaldehyde and 1,4-diaminobutane. Thermogravimetric analysis, elemental analysis and X-ray diffraction results showed this Schiff base to give a trinuclear complex with Ni(II) ions in presence of acetate ions. The complex crystallizes in the triclinic P-1 space group with a = 9.7510(2), b = 10.6854(2), c = 12.4781(4) Å, α = 112.101(3), β = 100.621(4) and γ = 91.733(3)°. Similar to those found in the literature the terminal Ni(II) ions are coordinated to the Schiff base and have a N2O4 coordination sphere. The central Ni(II) ion has a O6 coordination sphere formed by the phenolic oxygens and the acetate bridges. The conformation of the chelate ring formed between the Ni(II) ions and the iminic nitrogens were examined.

{[μ-Bis(salicylidene)-1,3-propanediaminato]-bis(4-methylpyridine)nickel(II)}dichlorozinc(II)

The title compound, [Ni(C 17 H 16 N 2 O 2 )(C 6 H 7 N) 2 {ZnCl 2 }], is a heteronuclear dimeric complex. The Ni atom has an irregular octahedral environment involving two O atoms and two N atoms from the bis(salicylidene)-1,3-propanediaminate ligand in the equatorial plane, and two N atoms from the two 4-methylpyridine groups in the apical positions. The Ni-O-Zn, O-Zn-O, Zn-O-Ni and O-Ni-O angles in the bridged plane are 99.58(9), 80.59 (8), 100.57(9) and 79.26 (8)°, respectively. The Ni...Zn distance is 3.0896 (9) A.

Crystal and molecular structure of a new trinuclear copper(II) complex : Cu3L2(NCS)2 · 2.5(C4H8O2), L = bis-N,N' (salicylidene )1,3-propanediamine dianion

A trinuclear Schiff base complex was synthesized from N,N′-bis(salicylidene)-1,3-propanediamine and Cu(II) ions in the presence of thiocyanate ions in dioxane media. The complex has a nonlinear nucleus structure with the central Cu(II) ion and terminal Cu(II) ions bonded through phenolic μ-bridges. One of the terminal Cu(II) ions is coordinated by a dioxane molecule, resulting in differentiation between the Cu…Cu distances. The central Cu(II) ion has an octahedral coordination sphere, whereas one of the terminal Cu(II) ions posseses a square pyramidal and the other a square planar coordination sphere. The thermal analysis results are in accord with the complex stochiometry. The thiocyanate ions surrounding the central Cu(II) ion are transformed into CuS between 230–280 °C.

3,3-Dichloro-4-(4-chlorophenyl)-1-phenylazetidin-2-one

In molecules of C 15 H 10 Cl 3 NO, the four-membered lactam ring is nearly planar, with a C-N bond length of 1.367 (4) A in the amide group and C-C distances of 1.535 (5) and 1.566 (5)A. The displacement of the amide N atom from the plane through the atoms attached to it is 0.056 (3) A, indicating some pyramidal character which is correlated to the biological activity in related compounds. The phenyl rings are nearly perpendicular to one another [dihedral angle 79.4 (1)°]. There are intramolecular and intermolecular hydrogen bonds in the structure.

Crystal structure of a new homo trinuclear Ni(II) complex with μ-cyanoacetato bridge

Abstract Ni(II)-Ni(II)-Ni(II) homo-trinuclear linear complex was prepared using bis-N,N′(2-hydroxybenzyl)-1,3-propanediamine in DMF (dimethyl formamide) medium. μ-bridges between metal nuclei are formed using formate, acetate, chloroacetate and benzoate ions. The structure of the homo-trinuclear complex was determined with X-ray diffraction method. It was found that the terminal Ni(II) ions have a N2O4 coordination sphere and central Ni(II) ion has a O6 octahedral coordination sphere. The chelate ring, formed by the coordination of terminal Ni atoms and aminic nitrogen atoms, was found to have a chair conformation. The complexes were elucidated by the use of thermogravimetry and differential thermal analysis method. In acetate, chloroacetate, cyanoacetate and benzoate containing complexes thermal dissociation of DMF took place first while in formate containing complex it was observed that formate bridges and the complex degraded together with the dissociation of DMF moiety. It was observed that the thermal stability of carboxylate μ-bridge affects the thermal stability of the homo-nuclear complex. The average bond energies of coordinated DMF molecules were determined and these coordinative bond energies were found to be in the dimension of that of hydrogen bonds.

Dichlorido-1κCl,3κCl-bis­{μ-2,2′-[pro­pane-1,3-diylbis(imino­methyl­ene)]di­phenol­ato}-1:2κ6O,N,N′,O′:O,O′;2:3κ6O,O′:O,N,N′,O′-tricopper(II)

The title linear trinuclear copper(II) complex, [Cu3(C17H20N2O2)2Cl2], was obtained from N,N′-bis(2-hydroxybenzyl)-1,3-propanediamine and CuCl2. The overall charge of the three Cu2+ ions is balanced by four deprotonated phenol groups and two Cl− ligands. The complex is centrosymmetric with the central Cu2+ occupying a special position (). This Cu2+ ion is coordinated by the four phenolate O atoms in a square-planar fashion. The second Cu2+ occupies a general position in a square-pyramidal fashion. Two phenolate O atoms and two amine N form the basal plane, with Cl− ligands occupying the fifth coordination site.

Bis{[μ-N,N′-bis­(salicyl­idene)-1,4-butane­di­amine-N,N′,O,O′-copper(II)]-μ-chloro-chloromercury(II)}

A new tetranuclear CuII–HgII–HgII–CuII complex, [Cu2Hg2Cl4(C18H18N2O2)2], has been prepared by means of a copper complex found in the literature. The molecular structure of this complex was determined by X-ray diffraction and the Cu–Hg–Hg–Cu chain was seen to be non-linear. The change in magnetic susceptibility with temperature was recorded for this complex and observed to abide by the Curie–Weiss law. The coordination around the HgII ions is square pyramidal. The Cu⋯Hg bridging distance is 3.5269 (7) A.