Huang Guo-sheng

Characterization and crystal structure of formylferrocenyl norbornenoyl hydrazone complexes with bivalent metals

Abstract Condensation of formylferrocene with bicyclo[2.2.1]hept-5-ene-2-carboxylic acid hydrazide yields a new ligand, formylferrocenyl-2-(5-norbornenoyl) hydrazone (HFfnh). Its cobalt(II), nickel(II), copper(II) and mercury(II) complexes were prepared. The ligand HFfnh acts as a uninegative bidentate organometallic ligand (ON). The crystal structure of the nickel(II) complex, Ni(Ffnh) 2 (C 38 H 38 N 4 O 2 Fe 2 Ni), has been determined by X-ray diffraction and shows that the nickel is in square planar coordination.

Coordination compounds of bis[(1-cinnamoylhydrazonoethyl) cyclopentadienyl] iron lanthanide

SummaryA new ligand, bis[(1-cinnamoylhydrazonoethyl)cyclopentadienyl] iron (BCHCI) has been prepared, and its complexes with lanthanides, Ln2(BCHCI)3Cl6·nH2O (Ln=Y, La, Ce, Pr, Nd, Sm, Eu, Dy, Ho. Er, Tm, Yb and Lu) have been made by reacting BCHCI with LnCl3. A structure for these complexes, in which the ligand coordinates to lanthanide ions in its ketone form in a 1.5∶1, molar ratio is suggested. The coordination numbers of the central metal ions are probably 8.

Synthesis and characterization of an organometallic Schiff base and its lanthanide chelates

SummaryA Schiff base containing an organometallic substituent,N, N′-[bis(ferrocenyl-1-oxo-3-methyl)propenyl]ethylenediamine (H2 bfe) and its chelates with lanthanide(III), [Ln(bfe)]Cl·0−1H2O (Ln=Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, or Lu) have been prepared and characterized by elemental analyses, i.r., u.v.,1H n.m.r., molar conductance, and t.g. analysis. The ligand is a tetradentate species and coordinates to the central lanthanide ion by the oxygen and nitrogen with 1∶1 stoichiometry. The chelates are 1∶1 electrolytes.

Lanthanide Complexes of Formylferrocene Salicylhydrazone

Abstract The complexes of formylferrocene salicylhydrazone (H2L) with some lanthanides, Ln(NaL)3·1-2H2O (1)(Ln = La, Nd, Dy, Er and Yb), and, Ln(L)Cl·1-2H2O (2) (Ln = La, Nd, Pr, Dy and Ho), have been prepared. The data of elemental analyses, UV, IR, 1H NMR, molar conductance and TGA show that the ligand coordinates to the central ions in the enolic form with a mole ratio of 3: 1 in complexes (1) and of 1: 1 in complexes (2). Referee I: L. Brammer Referee II: J. R. Morrow

ACETHYLFERROCENE-2-THENOYLHYDRAZONE COMPLEXES WITH TRANSITION METAL IONS

Complexes of acetylferrocene-2-thenoylhydrazone with Cu(II), Ni(II), Co(II) and Hg(II) have been prepared and characterized by elemental analyses, IR, NMR, electronic spectra, ESR, molar conductivity and thermal analyses. All results show that the ligand coordinates to the metal ion through the enolic oxygen and the azomethine nitrogen atoms as a bidentate donor.

N,N'-bis(1-ferrocenyl-1-oxo-3-methyl)propenylethylenediamine and its metal complexes

SummaryA new Schiff base ligand, N,N′-bis(l-ferrocenyl-1-oxo-3-methyl)propenylethylenediamine (H2L) and its copper(II), zinc(II), cobalt(II), nickel(II), cadmium(II) and manganese(II) complexes have been prepared, and the structure of the copper complex has been determined by single crystal X-ray techniques and refined to R = 0.041 for 7403 independent reflections. The copper atom is situated in a distorted planar environment. The dihedral angle between planes of two chelating rings which do not contain the metal is 33.5°. Two substituted Cp rings are conjugated with two chelating ‘acacim’ rings. The iron-centroid forms an angle of 179.4°. The Cp rings are twisted from the eclipsed conformation.

Metal(II) Complexes of 1,1′-Diacetylferrocene-Bis(4-Phenylthiosemicarbazone)

Abstract A new ligand, 1,1′-diacetylferrocene-bis(4-phenylthiosemicarbazone) (H2Dafpt) and some of its transition metal(II) complexes have been prepared. The complexes were characterized by elemental analyses, IR, NMR, electronic spectra, molar conductivities, magnetic moments and thermal analyses. Dafpt2− coordinates to the metal ion with two thio-enol groups and acts as a tetradentate.

The Chelates of Some Metals(II) with Schiff Bases From Thioarbohydrazide

Abstract Perrocenylthiocarbohydrazide (H2Fth), formylferro-cene salicylaldehyde thiocarbohydrazone (H2Fsth), and formylferrocene 2-acetyl-4-cresolthiocarbohydrazone (H2Fach) and their chelates with some metals have been prepared and characterized by elemental analysis, IR and NMR spectra. It is shown that H2Fth is a bidentate ligand which coordinates to central ions to form M(HFth)-Ac, while H2Fsth and H2Fach are tetradentate and coordinate to metal ions in form M2Fsth. AC2 and M2Fach. AC2.

LANTHANIDE ION COMPLEXES OF A LIGAND DERIVED FROM SALICYLALDEHYDE AND MALONYL DIHYDRAZONE

Abstract The chelates Na2[Ln(C34H28N8O8)Cl]·nH2O of the malonyl dihydrazone of salicylaldehyde with the lanthanides have been prepared and characterized by elemental analysis, IR, UV, molar conductance and TGA. It is shown that the ligand coordinates to the central ion with one hydrazone unit in the keto form and one chloride ion participates in coordination to the metal ion. These chelates are 1:2 electrolytes in DMF and are more thermostable than their ligand due to the formation of chelate rings.

Norbornenyl Aroylhydrazones and Their Copper (I) and Mercury (I) Complexes

Abstract Seven new aroyl hydrazones containing the norbornene group and their copper (I) and mercury (I) complexes have been synthesized and characterized by elemental analyses, electrolytic conductance, IR spectra, 1H NMR spectra and TGA analyses. These ligands coordinate to metal ions in the enolic form and act as bidentate ligands. All complexes are non-electrolytes in methanol — N,N-dimethylformamide (3 : 1 in volume).