Ma Yongxiang

Bis[(1-methyl-1-benzoylhydrazonoethyl)cyclopentadienyl]iron and its complexes with transition metals

Abstract The organometallic ligand derived from ferrocene(H 2 L), bis(1-methyl-1-benzoylhydrazonoethyl)cyclopentadienyl] iron has been prepared. A series of transition metal complexes: ML [M = Co(II), Ni(II), Zn(II), Cd(II), CU(II) and Mn(II)] and M(H 2 L)Cl 2 [M = Co(II), Ni(II), Cd(II) and Mn(II)] were obtained by reaction of the ligand with metal(II) acetates and chlorides respectively. The data of elemental analyses, IR, UV, NMR, molar conductance, TG and DTA show that the ligand coordinates in the enolic form with M(OAC) 2 and in the keto form with MCl 2 , and that the CN bond in complexes became very strong and much more thermostable than in the ligand due to forming the chelate ring.

Coordination complexes of acetylferrocene-m- nitrobenzoylhydrazone with lanthanides

Abstract The coordination complexes of acetylferrocene-m-nitrobenzoyl hydrazone(HL) with lanthanide elements, LnL 3 (where Ln = lanthanide), have been prepared by the reaction of HL with the metal(III) chlorides in acetonitrile. The data of elemental analyses, IR, UV, NMR, molar conductance, TG and DTA show that the ligand coordinates in the enolic form with a molar ratio of 3:1. The complexes are non-electrolytes in DMF, and are more thermostable than their ligands due to the formation of chelate rings.

Coordination complexes of formylferrocene benzoylhydrazone with lanthanides

Abstract The coordination complexes of formylferrocene benzoylhydrazone (HL) with lanthanide elements, LnL 3 · n H 2 O (where Ln = lanthanide and Y, n = 1–3), have been prepared by the reaction of HL with the metal(III) chlorides in acetonitrile. The elemental analyses, IR and UV spectra, molar conductance and thermal analyses show that the ligand coordinates to the metals in the enolic form with a molar ratio of 3 : 1. We propose a plausible structure and discuss the thermal properties for the complexes.

Chelates of acetylferrocene benzoylhydrazone with lanthanides

The chelates, Ln(HL)2Cl3·nH2O of acetylferrocene benzoylhydrazone with 15 lanthanide(III) metals have been prepared and characterized by elemental analysis, IR, UV, molar conductance, TG and DTA. It was found that the ligand coordinates to the central ions in the keto form, and some chloride ions and water molecules participate in coordination to the metal ion. The chelates are 1 : 1 electrolytes in methanol and DMF, and are more thermostable than their ligand due to the formation of chelate rings.

Preparation of some ferrocenylcarbonylhydrazones and their coordination compounds

Some new acylhydrazones(HL) containing the ferrocenyl group FcCONHNCHR [Fc = η5-C5H5FeC5H4; R = p-C6H4NO2 (I), p-C6H4OH (II), o-C6H4Cl (III), o-C6H4NO2 (IV), 2-furyl (V), 2-hydroxy-1-naphthyl (VI), o-C6H4OH (VII) and Fc (VIII)], have been synthesized by the condensing reaction of ferrocenylcarbonylhydrazine with some aldehydes. Nickel(II) chelates of these organometallic compounds, NiL2 have been prepared and characterized.

N-Ferrocenylcarbonyl-N′-benzoylhydrazine and its transition metal(II) complexes

SummaryA new ferrocene derivative, N-ferrocenylcarbonyl-N′-benzoylhydrazine (H2FB) and its transition metal complexes, [M(FB)]2·H2O (M = MnII, CoII, CuII, ZnII, CdII or HgII) and M(HFB)2·nH2O (M = MnII or CdII) were prepared by reacting H2FB with the metal(II) acetates and characterized by elemental analyses, i.r. and u.v. spectroscopy and t.g.a. H2FB appears to act as a tetradentate ligand, coordinating to the metal through the nitrogen enolic oxygen atoms.

Formylferrocene 2-thenoyl hydrazone and its bivalent transition metal complexes

Abstract The new ligand, formylferrocene 2-thenoyl hydrazone (HFfth) and some of its bivalent transition metal complexes have been prepared. The complexes were characterized by elemental analyses, molar conductivities, IR, NMR, UV, ESR and thermal analyses. In all the complexes, the ligand acts as bidentate donor coordinating to the metal ion via the azomethine nitrogen and enolic oxygen. The redox properties of the complexes have been studied by cyclic voltammetry.

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.

ACYLFERROCENE 2-FUROYL HYDRAZONES AND THEIR TRANSITION METAL(II) COMPLEXES

A series of new coordination complexes of Mn-II, Co-II, Ni-II, Cu-II and Hg-II with the new hydrazones derived from formylferrocene and/or acetylferrocene and 2-furoyl hydrazide have been synthesized and characterized by elemental analyses,electrical conductance, IR spectra, H-1 NMR spectra and TGA thermal analyses. These organometallic compounds act as uninegative bidentate (NO) ligands in the complexes. The IR spectra of the complexes reveals that the oxygen in the furyl ring does not participate in coordination. The complexes in DMF are non-electrolytes.

CHELATE COMPLEXES OF FORMYLFERROCENE AND ACETYLFERROCENE SALICYLHYDRAZONE WITH TRANSITION METALS

Abstract Two new ligands, formylferrocene salicylhydrazone (H2L1), acetylferrocene salicylhydrazone (H2L11) and 12 transition metal(II) complexes, M(HL)2·O-1H2O [M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II), UO2(II) and Mn(II)] have been prepared by the reaction of H2L with metal(II) acetate in EtOH-DMF. Elemental analyses, IR, UV, NMR and molar conductance show that the ligands coordinate to metal ions in the enol form. The ligands act as bidentates and their complexes in DMF are non-electrolytes.