scholarly journals Magnetic Moments and Electronic Spectra of Low-spin Cobalt(II) Complexes

1972 ◽  
Vol 45 (2) ◽  
pp. 461-465 ◽  
Author(s):  
Yuzo Nishida ◽  
Sigeo Kida
Keyword(s):  
Electronic Spectra ◽  
Magnetic Moments

scholarly journals Complexes of Pyridine-2-carbaldehyde S-Methylthiosemicarbazone with nickel(II) and copper(II)

1974 ◽  
Vol 27 (5) ◽  
pp. 1133 ◽  
Author(s):  
MA Malik ◽  
DJ Phillips
Keyword(s):  
Electronic Spectra ◽  
Magnetic Moments ◽  
Tridentate Ligands ◽  
Pale Yellow ◽  
Nickel Perchlorate

New complexes of pyridine-2-carbaldehyde S-methylthiosemicarbazone (pmts) with nickel(11) and copper(11) are reported, together with magnetic moments, infrared and electronic spectra. The pale yellow bis-ligand complexes with nickel perchlorate, tetrafluoroborate and nitrate have the ionic structures [Ni(pmts)2] X2, with six-coordinate nickel(11) and tridentate ligands. Thiocyanate co-ordination and bidentate pmts appear to be present in the six-coordinate orange-brown complex Ni(pmts)2(NCs)2. The complexes, Ni(pmts)X2 (X = Cl, Br), are halogen-bridged and six-coordinate. The complexes Cu(pmts)X2 (X = Cl, Br, NO3) do not appear to be five coordinate, and may be six coordinate.

Magnetism, electronic spectra, and structure of transition metal alkoxides. I. methoxides and ethoxides of chromium(II), manganese(II), Iron(II), cobalt(II), nickel(II), copper(II), titanium(III), chromium(III), and iron(III)

1966 ◽  
Vol 19 (2) ◽  
pp. 207 ◽  
Author(s):  
RW Adams ◽  
E Bishop ◽  
RL Martin ◽  
G Winter
Keyword(s):  
Transition Metal ◽  
Spectral Data ◽  
Electronic Spectra ◽  
Magnetic Moments ◽  
Field Parameter ◽  
Ligand Field ◽  
Metal Alkoxides ◽  
Infinite Lattices ◽  
Ligand Field Parameter

The magnetic moments and electronic spectra are reported for the following divalent transition metal methoxides: Cr(OCH3)2, Mn(OCH3)2, Fe(OCH3)2, Co(OCH3)2, Ni(OCH3)2, and Cu(OCH3)2. These measurements when coupled with the involatility and insolubility of the compounds favour structures based on infinite lattices composed either of regular (Mn, Fe, Co, and Ni) or distorted (Cr and Cu) MO6 octahedra. The spectral data place the ligand field parameter, Δ, for the methoxide group very close to that of water.

Copper(II) Dihydroxybenzoates; Synthesis and Properties

1993 ◽  
Vol 58 (6) ◽  
pp. 1363-1370 ◽  
Author(s):  
Jozef Sokolík ◽  
Brigita Lučanská ◽  
Gustáv Plesch ◽  
Ingrid Tumová ◽  
Aladár Valent ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Electronic Spectra ◽  
Room Temperature ◽  
Magnetic Moments ◽  
Tetragonal Distortion ◽  
High Toxicity ◽  
Antipyretic Activity ◽  
Pharmacological Screening ◽  
Cooperative Ordering

Compounds of composition Cu(2,5-DHB)2 . 4 H2O (DHB, dihydroxybenoate anion) and Cu(2,Y-DHB)2 . 8 H2O (Y = 4 or 6) were prepared as potential antiinflamatory gents with a view of pharmacological screening. The room-temperature magnetic moments allow to classify all compounds into the group of magnetically diluted copper(II) complexes. According the EPR and electronic spectra, the degree of tetragonal distortion increases passing from Cu(2,6-DHB)2 . 8 H2O (III) through Cu(2,4-DHB)2 . 8 H2O (I) to Cu(2,5-DHB)2 . 4 H2O (II. The complexes differ also in the cooperative ordering in their structures. All tested compounds exhibit higher antiinflamatory activities (on dextran edema) than free carboxylic acids. However, their effects were accompanied with relatively high toxicity. Remarkable results were also achieved on evaluating the antipyretic activity.

Coordination properties of β-alanine: new complexes with some transition metals cobalt(II), nickel(II), and copper(II)

1976 ◽  
Vol 54 (15) ◽  
pp. 2426-2431 ◽  
Author(s):  
Giuseppe Marcotrigiano ◽  
Ledi Menabue ◽  
Gian Carlo Pellacani
Keyword(s):  
Transition Metals ◽  
Carboxy Group ◽  
Electronic Spectra ◽  
Magnetic Moments ◽  
Chelating Agent ◽  
Neutral Ligand ◽  
Coordination Properties ◽  
Halide Complexes

The neutral six-coordinated tetragonal Co(β-ala)2•2H2O complex(β-ala = NH2CH2CH2COO−) was prepared. In this complex β-alanine acts as an O,N-chelating agent, as in the known Cu(β-ala)2•6H2O and Ni(β-ala)2•3H2O complexes. We also prepared some complexes of a type that is new for β-alanine, with stoichiometries such as M(β-alaH)2X2, M(β-alaH)4(ClO4)2 (M = Co and Ni), Cu(β-alaH)3(ClO4)2, and Cu(β-alaH)Cl2[Formula: see text] in which the ligand acts as a zwitterion and coordinates toward the carboxy group as a formally neutral ligand. The possibility of formulating the complexes as H2[M(β-ala)2X2] is discussed. The electronic spectra and the magnetic moments of the halide complexes are in accord with pseudo-tetrahedral, octahedral, and tetragonal stereochemistry for the cobalt(II), nickel(II), and copper(II) ions, respectively, while those of the perchlorate complexes are in accord with pseudooctahedral stereochemistry. The β-alanine hydrohalide salts and the bis(β-alaninium)tetrachlorocuprate complex were also prepared and are discussed.

Monocyclopentadieny1titanium(III) compounds. III. Complexes of oxygencontaining ligands

1973 ◽  
Vol 26 (1) ◽  
pp. 47 ◽  
Author(s):  
RSP Coutts ◽  
RL Martin ◽  
PC Wailes
Keyword(s):  
Physical Properties ◽  
Electronic Spectra ◽  
Magnetic Moments ◽  
Cp Ti

Complexes of the type cpTiX2,nL [where cp = π-cyclopentadienyl; X = Cl or Br; n = 1 when L = 1,2-dimethoxyethane (dme); n = 2 when L = ethanol (EtOH), or methanol (MeOH)] have been prepared. Various physical properties, including magnetism and electronic spectra, have been measured and interpreted on the basis of six-coordinate titanium(III) atoms. The magnetic moments of all complexes approximate to the spin-only value. ��� Reactions with dioxan did not result in the formation of stoichiometric complexes, while β-diketones caused rupture of the cp-Ti bonds as well as the halide-titanium bonds giving known tris-β- diketonates of titanium(III).

Synthesis and structural studies of iron(II) and iron(III) sulfonates

1981 ◽  
Vol 59 (4) ◽  
pp. 669-678 ◽  
Author(s):  
John S. Haynes ◽  
John R. Sams ◽  
Robert C. Thompson
Keyword(s):  
Electronic Spectra ◽  
Lattice Structure ◽  
Magnetic Moments ◽  
The Other ◽  
Antiferromagnetic Coupling ◽  
Structural Studies ◽  
Structural Isomerism ◽  
Mössbauer Data

The iron(II) sulfonates Fe(CF3SO3)2 and Fe(p-CH3C6H4SO3)2 have been prepared and on the basis of vibrational and electronic spectra and magnetic and MÖssbauer data have been assigned a layer lattice structure involving hexacoordinated iron(II) and terdentate bridging anions. The FeO6 chromophore in these compounds is distorted by a trigonal elongation along the C3 axis. Fe(CH3SO3)2 has been obtained in two isomeric forms, one having a trigonal elongation of the FeO6 chromophore, the other a trigonal compression. No structural isomerism has been found for the other iron(II) sulfonates; however, evidence for such isomerism in methanesulfonates of cobalt(II) and zinc(II) is presented. While Fe(CF3SO3)2 and Fe(p-CH3C6H4SO3)2 appear to be magnetically dilute the presence of antiferromagnetic coupling in both forms of Fe(CH3SO3)2 is indicated. The iron(III) sulfonates, Fe(CF3SO3)3, Fe(p-CH3C6H4SO3)3, and Fe(CH3SO3)3, have been prepared and all three are magnetically concentrated exhibiting magnetic moments which are significantly less than 5.92 BM and which decrease with decreasing temperature.

Preparation, Infrared Spectra, Electronic Spectra, and Magnetic Moments of Copper(II) Complexes of N-Acetylglycine and Their Amine Adducts

1974 ◽  
Vol 52 (21) ◽  
pp. 3607-3611 ◽  
Author(s):  
G. Marcotrigiano ◽  
G. C. Pellacani
Keyword(s):  
Infrared Spectrum ◽  
Infrared Spectra ◽  
Elemental Analysis ◽  
Magnetic Moment ◽  
Electronic Spectra ◽  
Magnetic Moments ◽  
The Other ◽  
Square Planar ◽  
Amine Adducts ◽  
Planar Pattern

Compounds of the type [CuA2•H2O]2 and [CuA2•4H2O]2 have been prepared, where A is N-acetylglycine (aceturic acid). Amine adducts of the type CuA2B (B = piperazine, 2,2′-bipyridine, and 1,10-phenantroline) and CuA2B2 (B = N-methylpiperazine, piperidine, morpholine, pyridine, and ethylenediamine) were obtained by reaction of the amines with CuA2•4H2O. Each complex was characterized by elemental analysis, infrared spectrum, electronic spectrum, and magnetic moment. For the piperazine and ethylenediamine adducts a square-planar pattern of coordination about copper(II) ion is probable, while for the other amine adducts a square-pyramidal structure is proposed. For all the complexes the coordination of the N-acetylglycine occurs only through the terminal carboxyl oxygen in a monodentate arrangement.

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