Sulphur-nitrogen chelating agents. VII. Five- and six-coordinate complexes of cobalt(II), nickel(II), and copper(II) with an S-N-S tridentate ligand

1969 ◽  
Vol 22 (9) ◽  
pp. 1817 ◽  
Author(s):  
SE Livingstone ◽  
JD Nolan
Keyword(s):  
High Spin ◽  
Electronic Spectra ◽  
Copper Complexes ◽  
Chelating Agents ◽  
Nickel Complexes ◽  
Tridentate Ligand ◽  
Octahedral Complex ◽  
Halide Complexes

Mono-ligand complexes of the tridentate ligand N-(2-methylthiophenyl)- 2?-methylthiophenylmethyleneimine (SNS) of the type MX2(SNS) (M = Co, Ni, Cu; X = Cl, Br, I, or FCS) have been prepared. The electronic spectra indicate that the cobalt halide complexes are five-coordinate, whereas the complex Co(NCS)2- (SNS) and the nickel complexes are six- coordinate and polymeric. The copper complexes CuX2(SNS) (X = Cl, Br) are possibly five-coordinate. ��� The bis-complexes of nickel [Ni(SNS)2]X2 (X = ClO4, BF4) are high- spin but the complex [Co(SNS)2](ClO4)2 appears to be a rare example of a low-spin octahedral complex of cobalt(II).

Sulphur-nitrogen chelating agents. VI. Five- and six-coordinate complexes of 3d metal ions with an SNN tridentate ligand

1969 ◽  
Vol 22 (8) ◽  
pp. 1613 ◽  
Author(s):  
PSK Chia ◽  
SE Livinhstone
Keyword(s):  
Metal Ions ◽  
High Spin ◽  
Infrared Spectra ◽  
Magnetic Moment ◽  
Nickel Complex ◽  
Copper Complexes ◽  
Chelating Agents ◽  
Iron Complex ◽  
Tridentate Ligand ◽  
Infrared Data

Mono-ligand complexes of 6-methylpyrid-2-yl-N-(2?-methylthiophenyl)- methyleneimine (SNSMe) of the type MX2(SNNMe) (M = Mn, Fe, Co, Xi, and Cu; X = Cl, Br, I, or NCS) have been prepared. Infrared data show that in all the complexes the ligand (SNNMe) is tridentate. The electronic and infrared spectra indicate that the complexes of manganese, iron, and cobalt are five-coordinate, whereas the nickel and copper complexes are six-coordinate and polymeric. The complex CO(NO3)2(SNNMe) is six- coordinate and contains one bidentate and one unidentate nitrato group. ��� The bis-ligand complexes [N(SNNMe)2]Y2 (M = Fe, Ni, and Cu; Y = ClO4 or BF4) were also isolated. The iron complex is low-spin (μ 1.5 B.M.) but the magnetic moment of the nickel complex (μ 3.0 B.M.) is normal for high-spin octahedral nickel(II).

Thio derivatives of β-diketones and their metal chelates. IX. Nickel and copper complexes of some new fluorinated monothio-β-diketones

1968 ◽  
Vol 21 (7) ◽  
pp. 1781 ◽  
Author(s):  
RKY Ho ◽  
SE Livingstone
Keyword(s):  
General Formula ◽  
High Spin ◽  
Copper Complexes ◽  
Nickel Complexes ◽  
Metal Chelates ◽  
Sulphur Atom ◽  
Derivatives Of ◽  
Infrared Data

Four new fluorinated monothio-β-diketones of general formula RC(SH)=CH- COCF3 have been prepared; they are: l,l,l-trifluoro-4-mercapto-4-(4-methylphenyl)but-3-en-2-one (R = p-methylphenyl), 1,1,1-trifluoro-4-mercapto-4- (4-methoxyphenyl)but-3-en-2-one (R = p-methoxyphenyl), 4-(4-bromophenyl)-l,l,l- trifluoro-4-mercaptobut-3-en-2-one (R = p-bromophenyl), and l,l,l-trifluoro-4- (2-furyl)-4-mercaptobut-3-en-2-one (R = 2-furyl). Their nickel complexes, which are brown and diamagnetic, yield stable high-spin bis-pyridine adducts. When R = p-MeC6H4, p-MeOC6H4, or p-BrC6H4 the ligand yields both copper(1) and copper(11) complexes but when R = 2-furyl only a copper(11) complex is obtained. Infrared data indicate that in the copper(1) complexes the ligand is coordinated through the sulphur atom only.

Anomalous magnetism of iron(II) complexes of methyl-substituted pyridylthiazoles

1972 ◽  
Vol 25 (4) ◽  
pp. 715 ◽  
Author(s):  
HA Goodwin ◽  
DW Mather
Keyword(s):  
Magnetic Properties ◽  
Temperature Dependence ◽  
High Spin ◽  
Metal Atom ◽  
Electronic Spectra ◽  
Chelating Agents ◽  
Strong Dependence ◽  
Chelating Agent ◽  
Crossover Region ◽  
Field Strengths

Bis-ligand iron(11) and nickel(11) complexes of the potentially tridentate chelating agents 2-(3-methyl-2-pyridylamino)-4-(2-pyridyl)thiazole and 2-(4-methyl- 2-pyridylamino)-4-(2-pyridyl)thiazole are described. The electronic spectra of the nickel(11) complexes show that the field strengths of the ligands are in the neighbourhood of the Crossover region for iron(11). The magnetic properties of the cationic iron(11) complexes are anomalous and consistent with a spin-equilibrium involving the nearly equi-energetic 5T2 and 1A1 states of the metal atom. The magnetism shows a strong dependence on the associated anion. 2-(6-Methyl-2-pyridylamino)-4- (2-pyridyl)thiazole is also described. In its bis-ligand iron(11) complexes it functions as a bidentate chelating agent and the complexes are high-spin. All three ligands may be deprotonated to yield inner complexes with iron(11) which in some instances have anomalous magnetic properties associated with the presence of a spin-equilibrium. 2-(6-Methyl-2-pyridyl)-4-(2-pyridyl)thiaole and its bis-ligand iron(11) and nickel(11) complexes are also described. The iron(11) complexes are high-spin and show normal temperature dependence of their magnetism.

Complexes of N-methyliminobis(methylenephosphonic) acid with cobalt, nickel, copper, and zinc

1988 ◽  
Vol 53 (5) ◽  
pp. 987-994 ◽  
Author(s):  
Ivan Lukeš ◽  
Zdeněk Kváča ◽  
Ivor Dominák
Keyword(s):  
High Spin ◽  
Electronic Spectra ◽  
Central Atom ◽  
Cobalt Complex ◽  
Nickel Complexes ◽  
Magnetic Susceptibilities ◽  
Cobalt Nickel ◽  
Copper And Zinc ◽  
Nickel Copper ◽  
Cobalt And Nickel

The 1 : 1 cobalt, nickel, copper and zinc complexes of N-methyliminobis(methylenephosphonic) acid, and 1 : 2 cobalt and nickel complexes were prepared. The effect of alkali and alkali earth metals as "external cations" on the crystallization and stoichiometry of solid cobalt complex was investigated. Infrared and electronic spectra and magnetic susceptibilities indicate that cobalt and nickel form high-spin complexes. The coordination sphere of the central atom is formed by a distorted octahedron of the ligand oxygen atoms.

Infrared and Electronic Spectral Studies of Cobalt(II) and Nickel(II) Complexes of N-Allyl Urea and N-Allyl Thiourea

1972 ◽  
Vol 50 (16) ◽  
pp. 2603-2609 ◽  
Author(s):  
P. P. Singh ◽  
I. M. Pande
Keyword(s):  
Magnetic Susceptibility ◽  
Electronic Spectra ◽  
Electrical Conductance ◽  
Spectral Studies ◽  
Ligand Field ◽  
Magnetic Susceptibility Data ◽  
Susceptibility Data ◽  
Halide Complexes ◽  
Ligand Field Parameters ◽  
Allyl Thiourea

Complexes of N-allyl urea (NAU) and N-allyl thiourea (NATU) with cobalt (II) and nickel (II) halides and perchlorates have been prepared and characterized by electrical conductance, magnetic susceptibility, infrared and electronic spectra. Infrared spectra suggest coordination in NAU through oxygen and in NATU through nitrogen. The electronic spectra and magnetic susceptibility data indicate tetrahedral and octahedral stereochemistry for cobalt (II) and nickel (II) halide complexes, respectively. The various ligand field parameters Dq, B′, and β calculated for these complexes show about 25 and 11% covalency for Co (II) and Ni (II), respectively, and suggest a weak ligand field.

scholarly journals High-Frequency and -Field EPR of a Pseudo-octahedral Complex of High-Spin Fe(II):  Bis(2,2‘-bi-2-thiazoline)bis(isothiocyanato)iron(II)

2004 ◽  
Vol 126 (21) ◽  
pp. 6574-6575 ◽  
Author(s):  
Andrew Ozarowski ◽  
S. A. Zvyagin ◽  
William M. Reiff ◽  
Joshua Telser ◽  
Louis-Claude Brunel ◽  
...  
Keyword(s):  
High Spin ◽  
High Frequency ◽  
Octahedral Complex

scholarly journals Synthesis, Spectral Characterization and Evaluation of Pharmacodynamic Activity of Copper and Nickel Complexes of Ethambutol Dihydrochloride

2006 ◽  
Vol 3 (4) ◽  
pp. 274-277 ◽  
Author(s):  
M. Mathrusri Annapurna ◽  
M. E. Bhanoji Rao ◽  
B. V. V. Ravi Kumar
Keyword(s):  
Metal Ion ◽  
Copper Complexes ◽  
Nickel Complexes ◽  
Octahedral Geometry ◽  
Spectral Characterization ◽  
Alamar Blue Assay ◽  
Alamar Blue ◽  
Thermal Data ◽  
Lowenstein Jensen ◽  
Assay Methods

Nickel and copper complexes of ethambutol [EB] were synthesized and characterized. On the basis of spectral and thermal data an octahedral geometry was assigned to the complexes with molecular formulae [Cu(C10H24N2O2)2Cl2] 5H2O and [Ni(C10H24N2O2)2Cl2] 2H2O. Coordination of ethylene diamine derivative to the metal ion was proposed. The anti-tubercular activity of the complexes was evaluated using Lowenstein–Jensen medium and MABA [Microplate Alamar Blue Assay] methods.

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