Far-infrared and electronic spectra of some bis(ethylenediamine) and related complexes of copper(II) and the relevance of these data to tetragonal distortion and bond strengths

1971 ◽  
Vol 10 (4) ◽  
pp. 817-826 ◽  
Author(s):  
Alfred B. P. Lever ◽  
Elvio Mantovani
Keyword(s):  
Electronic Spectra ◽  
Far Infrared ◽  
Tetragonal Distortion ◽  
Bond Strengths

scholarly journals The effect of temperature on the electronic spectra of octahedral iron(II) complexes

1968 ◽  
Vol 21 (12) ◽  
pp. 2859 ◽  
Author(s):  
G Winter
Keyword(s):  
Electronic Spectra ◽  
Tetragonal Distortion ◽  
Effect Of Temperature ◽  
Temperature Changes ◽  
Spectral Changes ◽  
Band Separation

Spectral changes in iron(11) complexes caused by temperature changes have been examined. When the iron(11) ion is surrounded by six equivalent ligands (FeC12, FeBr2, FeI2, FeSiF6,6H2O) the band separation that arises from the splitting of the 5Eg level decreases on cooling. The variation is proportional to the magnitude of the band separation. In complexes with tetragonal distortion (FeCl2,2H20, FeCl2,- 2CH3OH,FeCl2,4pyridine, FeCl2,2pyridine, FeCl2,4isoquinoline, FeBr2,4isoquinoline) the variation in band separation with change in temperature is smaller and is inversely related to the magnitude of the band separation.

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.

Composés de coordination de molécules soufrées. II. Complexes pseudo-tétraédriques et plan du nickel(II) avec quelques dithiole-1,2 thiones-3

1971 ◽  
Vol 49 (15) ◽  
pp. 2598-2604 ◽  
Author(s):  
François Yves Petillon ◽  
Jacques Emile Guerchais
Keyword(s):  
Solid State ◽  
Electronic Spectra ◽  
Spectral Region ◽  
Far Infrared ◽  
Infrared Spectral Region ◽  
Planar Complex ◽  
Square Planar ◽  
Infrared Spectral ◽  
Tetrahedral Complexes

The study of the far infrared spectral region permits one to distinguish between the pseudo-tetrahedral complexes NiI2L2 (L = R1R2C3S3 where R1 = CH3 and R2 = H, R1 = R2 = CH3, R1 = C4H3S and R2 = H) and the square planar complex NiI2L′2 (L′ = R1R2C3S3 where R1 = C6H5 and R2 = H). The electronic spectra recorded in the solid state confirm the distinction. The displacement of the band νC=S of the molecule 1,2-dithio-1-3-thione which enters the sphere of coordination is more marked in the complexes of cobalt(II) than in the corresponding nickel(II) complexes.

Some Oxime and Amide Complexes of NiCl2

1973 ◽  
Vol 51 (8) ◽  
pp. 1260-1264 ◽  
Author(s):  
M. E. Stone ◽  
K. E. Johnson
Keyword(s):  
Electronic Spectra ◽  
Tetragonal Distortion ◽  
Cyclohexanone Oxime

[Ni(Aox)4Cl2] (Aox = acetaldoxime), [Ni(Acm)4(H2O)2]Cl2 (Acm = acetamide), Ni(Cy)3Cl2 (Cy = cyclohexanone oxime), and [Ni(cap)6]Cl2(Cap = caprolactam) have been prepared. Their solution electronic spectra indicate approximately octahedral environments for Ni(II) while solid Ni(Aox)4Cl2 shows a small tetragonal distortion. The i.r. spectra can be accounted for by oxime bonding to Ni via nitrogen and amide bonding to Ni via oxygen alone.

ORGANIC COMPLEXES OF URANIUM: PART I. THE SYNTHESIS AND SPECTRUM OF URANYL PHTHALOCYANINE

1964 ◽  
Vol 42 (10) ◽  
pp. 2201-2208 ◽  
Author(s):  
J. E. Bloor ◽  
J. Schlabitz ◽  
C. C. Walden ◽  
A. Demerdache
Keyword(s):  
Electronic Spectrum ◽  
Infrared Spectra ◽  
Electronic Spectra ◽  
Far Infrared ◽  
Strong Absorption ◽  
Uranyl Compounds ◽  
Metal Phthalocyanines ◽  
Strong Band ◽  
Organic Complexes ◽  
Far Infrared Spectra

The preparation of uranyl phthalocyanine from uranyl chloride and dilithium phthalo-cyanine is described. The infrared and electronic spectra of the complex are quite different from that previously reported for uranyl phthalocyanine and it is suggested that previous workers obtained mainly a mixture of phthalocyanine (PcH2) and inorganic uranyl compounds. The infrared spectra of α- and β-PcH2, β-PcCu, PcLi2, and PcUO2 from 4000 to 300 cm−1; the far infrared spectra of β-PcH2, β-PcCu, and PcUO2 from 300 to 100 cm−1; and the electronic spectrum from 3500 to 10 000 Å of PcUO2 in 1-chloronaphthalene are recorded. A tentative assignment of a band at 278 cm−1 to the O—U—O bending frequency is made. The electronic spectrum of PcUO2 differs from previous spectra of metal phthalocyanines in that it possesses no strong absorption in the 6000–7000 Å region. It does, however, have a strong band at 9145 Å, ε = 4.15 × 104.

Physical, Chemical, and Crystallographic Characterization of Anodic Coatings on High Strength Aluminum Base Alloys

1976 ◽  
Vol 34 ◽  
pp. 636-637
Author(s):  
R. E. Herfert ◽  
N. T. McDevitt
Keyword(s):  
Sulfuric Acid ◽  
Salt Spray ◽  
High Strength ◽  
Environmental Stability ◽  
Anodic Films ◽  
Sodium Dichromate ◽  
Corrosion Resistant ◽  
Aerospace Applications ◽  
Bond Strengths ◽  
Adhesive Bonded Joints

Durability of adhesive bonded joints in moisture and salt spray environments is essential to USAF aircraft. Structural bonding technology for aerospace applications has depended for many years on the preparation of aluminum surfaces by a sulfuric acid/sodium dichromate (FPL etch) treatment. Recently, specific thin film anodizing techniques, phosphoric acid, and chromic acid anodizing have been developed which not only provide good initial bond strengths but vastly improved environmental durability. These thin anodic films are in contrast to the commonly used thick anodic films such as the sulfuric acid or "hard" sulfuric acid anodic films which are highly corrosion resistant in themselves, but which do not provide good initial bond strengths, particularly in low temperature peel.The objective of this study was to determine the characteristics of anodic films on aluminum alloys that make them corrosion resistant. The chemical composition, physical morphology and structure, and mechanical properties of the thin oxide films were to be defined and correlated with the environmental stability of these surfaces in humidity and salt spray. It is anticipated that anodic film characteristics and corrosion resistance will vary with the anodizing processing conditions.

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