Complexes of some rare earth metals with 1-amino-4-hydroxyanthraquinone

La, Ce(III), Pr, Nd and Sm(III) form very stable reddishviolet 1:1 complexes with 1-amino-4-hydroxyanthraquinone in methanol. The stability constants are very similar.     

Complexes of some platinum group metals with hydrazone ligands and their catalytic oxidative properties

Summary New complexes of ruthenium(II), ruthenium(III), osmium(III) and palladium(II) have been prepared with a neutral bidendate hydrazone ligand derived from antipyrine-4-carboxaldehyde and benzoylhydrazine. Ruthenium(III) complexes have also been synthesized from monobasic bidendate ligands prepared from benzaldehyde and benzoyl orp-substituted (Me, Cl) benzoyl hydrazine. The complexes were characterized by spectroscopic techniques and investigated by cyclic voltammetry. The efficient catalytic oxidation of alcohols and 3,5-di- ^t butyl catechol in the presence of N-methylmorpholine-N-oxide orm-chloroperbenzoic acid as co-oxidants is reported.

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Komplexe einiger Platinmetalle mit Hydrazonliganden und ihre katalytischen oxidativen Eigenschaften

Zusammenfassung Neue Komplexe von Ru(II), Ru(III), Os(III) und Pd(II) mit einem aus Antipyrin-4-carbaldehyd und Benzoylhydrazin hergestellten neutralen bidentaten Hydrazonliganden wurden synthetisiert. Im Fall von Ru(III) wurden auch aus Benzaldehyd und verschiedenen Benzoylhydrazinen gewonnene monobasische bidentate Liganden eingesetzt. Die Komplexe wurden mittels spektroskopischer Methoden charakterisiert und mit Hilfe der cyclischen Voltammetrie untersucht. Es wird über die effiziente katalytische Oxidation von Alkoholen und 3,5-di- ^t Butyl-katechol in Gegenwart von N-Methyl-morpholin-N-oxid oderm-Chlorperbenzoesäure als Co-Oxidantien berichtet.

     

Complexes of metals with mixed acidoligands

Conclusions Sulfatochloride complexes of bismuth(III) with the compositions MBiCl₂SO₄ (M=K, Rb, NH₄, CN₃H₃) and M₃Bi₂Cl₅ (SO₄)₂·3H₂O (M=K, Rb) were synthesized for the first time. Conclusions regarding the structures of the synthesized substances were drawn on the basis of an investigation of their IR and NQR spectra.For Communication 9, see [1].Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 973–978, May, 1984.The authors thank I. B. Baranovskii for obtaining the long-wave IR spectra.     

Complexes of rare-earth metals with meconic acid

Two series of complexes of meconic acid (H₃ Mec) with rare-earths have been prepared by varying the preparative procedure. The compounds have the general formulae, [Ln(Mec) (H₂O)₂]·3 H₂O (whereLn=La, Ce, Pr, Nd, Sm, Ho and Y) and [Ln(HMec) (H₂ Mec) (H₂O)₂]·4 H₂O (whereLn=La, Pr, Nd and Sm). The infrared spectral data indicate that the carboxylate groups are bound to the rare-earth metal in a bidentate fashion. Thermal studies indicate that two water molecules are coordinated in each case. The complexes are probably polymeric.

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Komplexe von Seltenerd-Metallen mit Meconsäure

Zusammenfassung Es wurden zwei Reihen von Komplexen der Meconsäure (H₃ Mec) mit Seltenerd-Metallen mit den allgemeinen Formeln [Ln(Mec)(H₂O)₂]·3 H₂O (Ln=La, Ce, Pr, Nd, Sm, Ho, Y) und [Ln(HMec)₂(H₂ Mec) (H₂O)₂]·4 H₂O (Ln=La, Pr, Nd, Sm) hergestellt. Die IR-Spektren zeigen, daß die Carboxylat-Gruppen in zweizähniger Weise mit den Metallionen koordinieren; thermische Untersuchungen ergeben, daß in beiden Reihen jeweils zwei Wassermoleküle zusätzlich koordiniert sind. Die Komplexe weisen wahrscheinlich eine Polymerstruktur auf.

     

Complexes of zinc-group metals with oxamic acid

In this communication the preparation, for the first time, and the properties of the complexes of oxamic acid with Zn(II), Cd(II) and Hg(II) are reported. Analytical, conductometric and IR spectral data have been used for the characterization of the new complexes.An octahedral configuration is proposed for the Cd(II) complex, while in the Zn(II) and Hg(II) complexes the central metal ions appear to be in four-coordinate environments.     

Complexes of metals with paramagnetic 3-Imidazoline schiff bases

Methods for the synthesis of intracomplex bischelates CuL₂, NiL₂, CoL₂, and the mixed- ligand complex NiL₂y₂, where L is a deprotonated derivative of the stable nitroxide 4- (2′- hydroxyphenyl)- 2,2,5,5tetramethyl- 3- imidazoline- 1-oxyl, were developed. In the solid state, the compounds have a molecular structure. The most significant difference in the structure of ML₂ molecules lies in the values of the angle between the chelate rings (56.9‡ for CuL₂, 78.8‡ for CoL₂, and 0‡ for NiL₂. In complexes with paramagnetic metal ions, the intramolecular exchange interactions are ferromagnetic in character and are close in the order of magnitude (5.7 cm^{− 1} for CuL₂ and 6.8 cm⁻ for NiL₂Py₂) to the values for complexes with deprotonated enaminoketone derivatives of 3- imidazoline. The NiL₂ molecules, having a square coordination of the central atom, are biradicals with antiferromagnetic exchange interactions between the unpaired electrons of nitroxyl groups (− 3.6 cm⁻). The transformation of NiL₂ into NiL₂Py₂ leads to a transition of Ni(II) from the low- to high- spin state and to ferromagnetic exchange between the unpaired electrons of the paramagnetic centers. Translated fromZhumal Strukturnoi Khimii, Vol. 38, No. 4, pp. 750–761, July–August, 1997.     

Complexes of transition metals with 3-hydroxy- and 3-carboxycoumarins

Conclusions The complexes of Ag(I), Cu(II), Ni(II), Pd(II), and Rh(I), containing either 3-hydroxy- or 3-carboxycoumarin as the ligand, were synthesized.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khmicheskaya, No. 6, pp. 1418–1421, June, 1974.     

Complexes of macrocyclic polyethers with some potassium monoethyl benzeneazophosphonates

Complexes of the potassium monoethyl ester of [-(4-benzeneazoanilino)-N-benzyl]phosphonic acid, [-(4-benzeneazoanilino)-N-4-hydroxybenzyl]phosphonic acid and [-(4-benzeneazoanilino)-N-4-methoxybenzyl]phosphonic acid with dibenzo- 18-crown-6 and dibenzo-24-crown-8 have been studied. The new complexes were identified and characterized on the basis of elemental and thermogravimetric analysis, conductivity measurements, and UV, IR and ¹H NMR spectra. The results obtained were compared with those obtained for the corresponding sodium monoalkyl benzeneazophosphonate complexes. It has been observed that the formation of salt complexes is controlled by a combination of factors, including the metal cation size in relation to the polyether hole, size and charge density of the anion, as well as the choice of the reaction solvent.     

Complexes of hydrazine and substituted hydrazines with some oxocations

Summary Several new polymeric complexes of general composition MO_n(L)₄X₂ (where M = V, Zr and U; n = 1 or 2; X = Cl, Br, I, NO₃ and NCS and L = N₂H₄, PhNHNH₂ and Me₂NNH₂ have been synthesised and characterized by elemental and d.t. analyses and by magnetic measurements, electronic and i.r. spectra. The vanadyl(IV) complexes exhibit subnormal magnetic moments (1.26–1.36BM) possibly because of exchange interaction between vanadium(IV) ions. The thermal stability of hydrazine complexes fall in the order: Cl>Br>NCS>I. The M-N bond strength, as revealed, by v(M-N), decreases as: Me₂NNH₂>N₂H₄>PhNHNH₂.Presented in symposium on Frontiers of coordination chemistry, Allahabad University, Allahabad, Dec. 6–8, 1979.     

Alkali metal complexes: Complexes of alkali metals with quinaldinic acid

Complexes having the general formula ML.HL, where M = Na, K, Rb or Cs and HL = quinaldinic acid, have been obtained. The isolation of adducts in the solid state appeared to be favoured by increase in atomic radius, and hence decrease in ionisation potential of the metal. Attempts to synthesise similar adducts of picolinic acid N-oxide and quinaldinic acid N-oxide did not succeed. Complexes have been characterised by elemental analyses, thermal, IR spectral and solution studies. Our findings suggest that pK value of the ligands cannot be regarded a dominant factor in the synthesis and isolation of alkali metal complexes.     

Complexes of 2-(2-hydroxyacetophenone)imino-5-(p-anisyl)-1,3,4-oxadiazole with some bivalent metals ions

Summary The metal complexes of the type [M(SB)₂(H₂O)₂] and [M(SB)₂][where M = Mn^II, Co^II, Ni^II or Cu^II, M = Zn^II Cd^II, Hg^II and Pb^II and SBH = 2-(2-hydroxyacetophenone)imino-5-(p-anisyl)-1,3,4-oxadiazole] have been prepared and characterised by elemental analyses, thermal analyses, magnetic measurements, electronic and infrared spectral studies. The complexes [M(SB)₂(H₂O)₂] possess octahedral structures, whereas complexes [M(SB)₂] are tetrahedral. The crystal field parameters of the Co^II and Ni^II complexes are also calculated.     

Complexes of hydroxamic derivatives of carboxymethyl- and carboxyethylaubazidan with some d-elements

Complexes of hydroxamic derivatives of carboxymethyl- and carboxyethylaubazidan with Fe³⁺, Cu²⁺, Ni²⁺, Co²⁺, Mn²⁺ cations were synthesized. The structure and composition of the obtained compounds were studied by the IR and electronic spectroscopy and elemental analysis.