scholarly journals Coordinating Properties of the Fluorosulfate Ion. Tetrakis(pyridine) Complexes of Zinc(II), Copper(II), and Nickel(II) Fluorosulfates

1974 ◽  
Vol 52 (18) ◽  
pp. 3218-3228 ◽  
Author(s):  
Carl S. Alleyne ◽  
Robert C. Thompson
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Metal Ions ◽  
Electronic Properties ◽  
Infrared Spectra ◽  
Copper Complex ◽  
Electronic Spectra ◽  
Nickel Complexes ◽  
Ionic Dissociation ◽  
Distorted Octahedral

Complexes of the type M(py)4(SO3F)2 (py = pyridine, M = Ni, Cu, Zn) have been prepared and characterized. Infrared spectra of all three complexes, electronic spectra and magnetic susceptibility studies of the copper and nickel complexes, and e.p.r. studies of the copper complex are reported. The complexes have tetragonally distorted octahedral structures with fluorosulfate groups coordinated to metal ions as unidentate ligands. To facilitate comparison of the coordinating action of the fluorosulfate ion with other polyatomic anions the complexes, Cu(py)4X2 (X = ClO4−, BF4−, NO3−, p-CH3C6H4SO3−, CF3CO2−) have been prepared and their electronic properties examined. The studies indicate that the coordinating strength of SO3F− towards metals is greater than ClO4−, BF4−, and NO3− but less than p-CH3C6H4SO3− and CF3CO2−. Electrical conductivity studies on solutions in acetonitrile indicate a correlation between the relative coordinating strength of the anion in a given complex and the extent to which the complex undergoes ionic dissociation in this solvent.

Basic halides and related species of molybdenum(III). II. Spectroscopic and magnetic properties of MoOF(H2O)3 and MoOCl(H2O)3

1976 ◽  
Vol 29 (4) ◽  
pp. 717 ◽  
Author(s):  
DJ Stabb
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Absorption Spectroscopy ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Related Species ◽  
Bound Water ◽  
Temperature Range ◽  
Field Dependent

Two basic halides of molybdenum(111), namely MoOF(H2O)3 and MoOCl(H2O)3 (some samples containing additional loosely bound water), were investigated by absorption spectroscopy in the range 200-50000 cm-1, and by magnetic susceptibility measurements over a temperature range of 100-300 K. Infrared spectra showed bands at about 670 and 1600 cm-l, but not in the range 800-1100 cm-1. Electronic spectra showed poorly defined bands superimposed on strong general absorption. Very weak paramagnetism was observed: this was field dependent. The results are interpreted to show the compounds to be oxygen-bridged polymers [MOX(H2O)3O]n, rather than species containing Mo=O or Mo-0-H groups.

Electrical Conductivity, Magnetic Susceptibility, and Infrared Spectra in the Superconducting Systems BiSrCaCuO and TlBaCaCuO

1989 ◽  
Vol 153 (1) ◽  
pp. 307-313 ◽  
Author(s):  
H. Gruber ◽  
E. Krautz ◽  
H. P. Fritzer ◽  
K. Gatterer ◽  
A. Popitsch
Keyword(s):  
Electrical Conductivity ◽  
Magnetic Susceptibility ◽  
Infrared Spectra

scholarly journals Polymetallic Complexes Part LXXXXV Bis-bidentate Donor Azodye Dimeric Complexes

1970 ◽  
Vol 44 (4) ◽  
pp. 445-452 ◽  
Author(s):  
Bipin Bihari Mahapatra ◽  
Nilanchala Patel
Keyword(s):  
Magnetic Susceptibility ◽  
Key Words ◽  
Electronic Spectra ◽  
Structure Elucidation ◽  
X Ray Diffraction ◽  
Antifungal Activities ◽  
X Ray ◽  
Dimeric Complexes ◽  
Distorted Octahedral ◽  
Polymetallic Complexes

Twelve dimeric complexes of Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) with two new bis-bidentate donor azodye ligands, 4,4'-bis (2'-hydroxy-3',5'-dinitrophenylazo) diphenylsulphone and 4,4'-bis (2'-hydroxy-5'-nitrophenylazo) diphenylsulphone has been synthesized. The structure elucidation of the complexes was made basing upon analytical, conductance, magnetic susceptibility, IR, electronic spectra, ESR, NMR, and X-ray diffraction (powder pattern) data. Antifungal activities of the ligands and a few complexes were also studied. The cobalt (II) and nickel (II) complexes are found to be octahedral, copper (II) complexes are distorted octahedral and a tetrahedral stereochemistry has been suggested to Zn (II), Cd (II) and Hg (II) complexes. Key words: Polymetallic complexes; Azodye complexes; Multidentate ligands. DOI: 10.3329/bjsir.v44i4.4596 Bangladesh J. Sci. Ind. Res. 44(4), 445-452, 2009

scholarly journals Preparation of New Complexes

2013 ◽  
Vol 10 (3) ◽  
pp. 497-508
Author(s):  
Baghdad Science Journal
Keyword(s):  
Magnetic Susceptibility ◽  
Metal Ions ◽  
Absorption Spectra ◽  
Infrared Absorption ◽  
Elemental Analysis ◽  
Electronic Spectra ◽  
Molar Conductance ◽  
Spectroscopic Techniques ◽  
Non Linear ◽  
Infrared Absorption Spectra

This paper deals with the preparation and investigation studies of a number of new complexes of Cu(II) , Zn(II) , Hg(II) , Ag(I) , Pt(IV) and Pb(II).The complexes were formed by the reaction of the mentioned metal ions with the ligand which is derived from oxadiazole (OXB), 2- (2-butyl) thio-5- phenyl – 1,3,4 – oxadiazole in the mole ratio (1:1) , (1:2) and (1:3) (metal to ligand ).The result complexes having general formulae :M(OXB)Cl2] [M(OXB)X2]H2O [ M= Cu(II) , Zn(II) M= Hg(II) , Pb(II) [M(OXB)2 X2] X= Cl– M = Cu (II), Zn (II), Hg (II), Pb (II) X= Cl–, NO3-, CH3COO- [Pt(OXB)3]Cl4 [Ag(OXB)]NO32-(2-??????? ) ???? -5- ???? –4,3,1– ???????????? OXB = These complexes have been characterized by variety of chemical, physical and spectroscopic techniques , such as elemental analysis , molar conductance , Infrared absorption spectra , electronic spectra and magnetic susceptibility measurements . These studies indicate that the tetracoordinate complexes have either square planer or tetrahedral structures and the hexacoordinate complexes while that bidentate complexes for Ag(I) have been found to have non-linear (deviated) structure . Furthermore, the prepared complexes ability was tested as their bactericidal materials.

The electronic spectra of coordinated nitrite ion: correlation between spectra and structure

1980 ◽  
Vol 58 (8) ◽  
pp. 823-832 ◽  
Author(s):  
Ian M. Walker ◽  
A. B. P. Lever ◽  
Paul J. McCarthy
Keyword(s):  
Fine Structure ◽  
Metal Ions ◽  
Single Crystals ◽  
Electronic Spectrum ◽  
Electronic Spectra ◽  
Electronic Transition ◽  
Structure Elucidation ◽  
Nickel Complexes ◽  
Nitrite Ion ◽  
Oxygen Atoms

The characteristic electronic spectrum of the nitrite ion survives when the ion is bonded to metal ions through the oxygen atoms. The vibrational fine structure associated with the n → π* electronic transition in the near uv region has been examined at 10 K in single crystals of K3[Hg(O2N)4](NO3) and in a series of nickel complexes with N-alkylated ethylenediamines. When either non-coordinated, monodentate oxygen coordinating, or bidentate chelating through oxygen, nitrite ion in the crystals shows vibronic features which depend on nitrite environment. It is suggested that the electronic spectra of the nitrite ion may constitute a useful tool in structure elucidation.

Spectral and Magnetic Properties of Dithiocyanato bis (Biguanide) Chromium(III) Thiocyanate

1974 ◽  
Vol 29 (7-8) ◽  
pp. 492-494 ◽  
Author(s):  
A. Syamal
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Infrared Spectra ◽  
Magnetic Moment ◽  
Electronic Spectra ◽  
Title Compound ◽  
Ligand Field ◽  
Octahedral Structure ◽  
Modified Method ◽  
Infrared Spectral

A reinvestigation of the title compound is reported. The compound has been prepared by a modified method and characterised by infrared spectra, electronic spectra and magnetic susceptibility measurements. The infrared spectral data suggest that the two coordinated thiocyanate ions are bonded to chromium(III) through N atoms rather than the S atoms. The complex exhibits two ligand field bands at 20410 and 26660 cm-1 due to the transitions 4A2g → 4T2g and 4A2g → 4T1g (F) respectively. Electronic spectral and magnetic moment data suggest that the complex has an octahedral structure with d2sp3 bonding.

Donor properties of 2-aminothiazole and 2-acetylaminothiazole towards cobalt(II) halides

1974 ◽  
Vol 27 (3) ◽  
pp. 509 ◽  
Author(s):  
PP Singh ◽  
AK Srivastava
Keyword(s):  
Magnetic Susceptibility ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Point Group ◽  
Carbonyl Oxygen ◽  
Ligand Field ◽  
Tetrahedral Configuration ◽  
X Ray ◽  
Ligand Field Parameters

Molecular addition complexes of the type CoL2X2 (X = Cl, Br, I and L = 2-aminothiazole and 2-acetylaminothiazole) have been prepared and studied by infrared spectra, electronic spectra, magnetic susceptibility and X-ray powder data. Infrared and electronic spectra suggest coordination through exocyclic nitrogen in 2-aminothiazole and through carbonyl oxygen in 2-acetylaminothiazole. The complexes have tetrahedral configuration and belong to the C2" point group. Ligand field parameters Dq, B' and β show more covalency in 2-aminothiazole complexes than in 2-acetylamino-thiazole complexes and suggest a weak ligand field for both the ligands.

A series of tetranuclear [2 × 2] grid complexes derived from an asymmetric ligand: Structural differences based on metal ion affinities

2011 ◽  
Vol 83 (9) ◽  
pp. 1721-1729 ◽  
Author(s):  
Takuya Shiga ◽  
Mao Noguchi ◽  
Takuto Matsumoto ◽  
Hiroki Sato ◽  
Hirotaka Tahira ◽  
...  
Keyword(s):  
Magnetic Susceptibility ◽  
Carboxylic Acid ◽  
Metal Ions ◽  
Copper Complex ◽  
Metal Ion ◽  
Copper Ions ◽  
Acid Methyl Ester ◽  
Water Molecules ◽  
Pyridine Carboxylic Acid ◽  
Pyridine Carboxylic

A series of tetranuclear grid-type complexes were prepared by the reaction of the asymmetric multidentate ligand HL (HL = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridine carboxylic acid ethylester) with different metal sources. The tetranuclear copper complex, [Cu4(L1)4(NO3)4(H2O)4]·Et2O·2MeOH (1, HL1 = 2-[3-(2-hydroxyphenyl)-1H-pyrazol-5-yl]-6-pyridine carboxylic acid methyl ester) consists of four ligands, four copper ions, four nitrate ions and four water molecules, forming a [2 × 2] grid structure, in which all four copper ions have the same coordination environment. On the other hand, the corresponding nickel and cobalt complexes, [M4(L2)4(H2O)4]·4MeOH·6H2O (M = Ni (2) and Co (3), (H2L2 = 6-[1,3-dioxo-3-(2-phenyl)propionyl]pyridine-2-carboxylic acid)), have a similar grid core structure to the copper complex with four metal ions, four ligand molecules, and four water molecules, however, in these clusters there are two kinds of coordination site for the metal ions. Temperature-dependent magnetic susceptibility measurements for all complexes demonstrated that antiferromagnetic interactions between the metal ions were in operation. The magnetic susceptibility data of the copper and nickel complexes were analyzed using a tetranuclear model based on H = –2J(S1S2+S2S3+S3S4+S4S1) to give best-fit parameters of g = 2.11(1), J = –1.39(3) cm–1 and g = 2.19(1), J = –0.44(2) cm–1, respectively.

Revisiting the passivation of stainless steels and other passive CRAs

2018 ◽  
Vol 106 (1) ◽  
pp. 107 ◽  
Author(s):  
Jean- Louis Crolet
Keyword(s):  
Electrical Conductivity ◽  
Metal Ions ◽  
Base Metal ◽  
Stainless Steels ◽  
Electronic Conductivity ◽  
Transport Processes ◽  
General Knowledge ◽  
Inorganic Polymers ◽  
Faraday Cage

All that was said so far about passivity and passivation was indeed based on electrochemical prejudgments, and all based on unverified postulates. However, due the authors’ fame and for lack of anything better, the great many contradictions were carefully ignored. However, when resuming from raw experimental facts and the present general knowledge, it now appears that passivation always begins by the precipitation of a metallic hydroxide gel. Therefore, all the protectiveness mechanisms already known for porous corrosion layers apply, so that this outstanding protectiveness is indeed governed by the chemistry of transport processes throughout the entrapped water. For Al type passivation, the base metal ions only have deep and complete electronic shells, which precludes any electronic conductivity. Then protectiveness can only arise from gel thickening and densification. For Fe type passivation, an incomplete shell of superficial 3d electrons allows an early metallic or semimetallic conductivity in the gel skeleton, at the onset of the very first perfectly ordered inorganic polymers (- MII-O-MIII-O-)n. Then all depends on the acquisition, maintenance or loss of a sufficient electrical conductivity in this Faraday cage. But for both types of passive layers, all the known features can be explained by the chemistry of transport processes, with neither exception nor contradiction.

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