THE PREPARATION OF SOME THIOSEMICARBAZONES AND THEIR COPPER COMPLEXES. PART I

1960 ◽  
Vol 38 (5) ◽  
pp. 712-719 ◽  
Author(s):  
B. A. Gingras ◽  
R. W. Hornal ◽  
C. H. Bayley
Keyword(s):  
Complex Formation ◽  
Aromatic Aldehyde ◽  
Infrared Spectra ◽  
Copper Complexes ◽  
Chemical Evidence

A number of thiosemicarbazones and their 1:1 copper complexes are described and the possible structures of the latter are discussed. Formation of copper complexes from aromatic aldehyde and ketone thiosemicarbazones results in a loss of one H atom as indicated by infrared spectra. In the aliphatic series, no loss of H atom is apparent upon complex formation. It is reasonable to assume that different processes are involved resulting in two possible structures for the aromatic and the aliphatic copper complexes. Some chemical evidence supports this view.

THE PREPARATION OF SOME THIOSEMICARBAZONES AND THEIR COPPER COMPLEXES: PART III

1962 ◽  
Vol 40 (6) ◽  
pp. 1053-1059 ◽  
Author(s):  
B. A. Gingras ◽  
T. Suprunchuk ◽  
C. H. Bayley
Keyword(s):  
Hydrogen Atom ◽  
Complex Formation ◽  
Infrared Spectra ◽  
Copper Complexes ◽  
Cyclization Product

Reactions of some diketones with thiosemicarbazide have been studied under various conditions. Monothiosemicarbazones, dithiosemicarbazones, and cyclization products can be obtained. It was found that dithiosemicarbazones form 1:1 complexes with Cu(II) but failed to react with Cu(I). Dithiosemicarbazones in which the N2-hydrogen atom has been replaced by Me do not form complexes, confirming our views about the importance of this hydrogen atom in the thione ↔ thiol tautomerism necessary for complex formation. 4,4-Dimethyldithiosemicarbazones behave like the unsubstituted parent compounds in forming 1:1 complexes with Cu(II). Infrared spectra provide evidence for the structure of a cyclization product, 5,6-diphenyl-3-thio-1,2,4-triazine, which had been erroneously described by various authors as the thiol tautomer, 5,6-diphenyl-3-mercapto-1,2,4-triazine.

scholarly journals Solid-State Synthesis, Characterization, and Biological Activity of the Bioinorganic Complex of Aspartic Acid and Arsenic Triiodide

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Guo-Qing Zhong ◽  
Wen-Wei Zhong ◽  
Rong-Rong Jia ◽  
Yu-Qing Jia
Keyword(s):  
Crystal Structure ◽  
Biological Activity ◽  
Solid State ◽  
Complex Formation ◽  
Aspartic Acid ◽  
Infrared Spectra ◽  
Room Temperature ◽  
Biological Test ◽  
Bridge Structure ◽  
Monoclinic System

The bioinorganic complex of aspartic acid and arsenic triiodide was synthesized by a solid-state reaction at room temperature. The formula of the complex is AsI3[HOOCCH2CH(NH2)COOH]2.5. The crystal structure of the complex belongs to monoclinic system with lattice parameters:a=1.0019 nm,b=1.5118 nm,c=2.1971 nm, andβ=100.28°. The infrared spectra can demonstrate the complex formation between the arsenic ion and aspartic acid, and the complex may be a dimer with bridge structure. The result of primary biological test indicates that the complex possesses better biological activity for the HL-60 cells of the leukemia than arsenic triiodide.

INFRARED SPECTRA OF 2,6-DIMETHYL-4-PYRONE COMPLEXES

1961 ◽  
Vol 39 (6) ◽  
pp. 1184-1189 ◽  
Author(s):  
Denys Cook
Keyword(s):  
Complex Formation ◽  
Oxygen Atom ◽  
Carbonyl Group ◽  
Lewis Acid ◽  
Frequency Band ◽  
Infrared Spectra ◽  
Donor Site ◽  
Carbonyl Oxygen ◽  
Acid Strength ◽  
Group A

The infrared spectra of 2,6-dimethyl-4-pyrone in solution, and in complexes with HgCl2, ZnCl2, BF3, SbCl5, and HBr have been recorded. A band at 1639 cm−1 in the free pyrone moves to progressively lower frequencies in the complexes as the Lewis acid strength increases, identifying this band as the carbonyl stretching frequency and the donor site as the carbonyl group. A higher-frequency band, at 1678 cm−1 in the free pyrone, moves to lower frequency on complex formation, but to a much smaller extent, and is to be identified with a stretching mode of the ring. The site of protonation in 2,6-dimethyl-4-pyrone salts has been unequivocally shown to be the carbonyl oxygen atom.

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).

Infrared Spectra of Some Trivalent Earth Metal Cupferrone Complexes

1974 ◽  
Vol 29 (1-2) ◽  
pp. 24-27 ◽  
Author(s):  
A. H. Abou El Ela ◽  
H. H. Afifi
Keyword(s):  
Complex Formation ◽  
Absorption Spectra ◽  
Ammonium Salt ◽  
Infrared Spectra ◽  
Earth Metal ◽  
Ir Absorption ◽  
Absorption Bands ◽  
Ir Absorption Spectra

The IR absorption spectra of the ammonium salt of cupferrone and aluminium, scandium, yttrium and lanthanum trivalent cupferrate complexes are investigated. The IR absorption bands identified in the region 400-4000 cm-1 are given and assigned. It is shown that on complex formation NO stretching frequencies are lowered and new absorption bands are observed and assigned to the M-O band.

Factor analysis as a complement to band resolution techniques. VI. Complex formation between pentachlorophenol-OD and acetone

1979 ◽  
Vol 57 (20) ◽  
pp. 2707-2713 ◽  
Author(s):  
J. Korppi-Tommola ◽  
H. F. Shurvell
Keyword(s):  
Principal Component Analysis ◽  
Factor Analysis ◽  
Complex Formation ◽  
Equilibrium Constant ◽  
Isotope Effect ◽  
Infrared Spectra ◽  
Equilibrium Constants ◽  
Principal Component ◽  
Proton Donor ◽  
Good Agreement

Complex formation between pentachlorophenol-OD (PCP-OD) and acetone and acetone-d6 in CCl4 solution has been studied. Digitized infrared spectra in the O—D stretching region ν(OD) of PCP-OD and the C—O stretching region ν(CO) of acetone have been recorded from solutions of various concentrations. The present results are compared with previous work on complex formation between PCP and the same acceptor molecules. In the ν(OD) region, factor analysis (principal component analysis) and a concentration study of the areas of the resolved band components suggest that two (1:1) complexes occur in solution. The equilibrium constant obtained for one of the complexes shows an isotope effect due to deuteration of the proton donor. In the ν(CO) region, only one band due to complexed species was resolved. Equilibrium constants calculated using the results from the ν(OD) and ν(CO) regions are in good agreement with each other.

PROTON MAGNETIC RESONANCE AND INFRARED SPECTRA OF SOME COMPLEXES OF N,N-DIMETHYLACETAMIDE

1966 ◽  
Vol 44 (16) ◽  
pp. 1881-1887 ◽  
Author(s):  
A. J. Carty
Keyword(s):  
Magnetic Resonance ◽  
Complex Formation ◽  
Infrared Spectra ◽  
Proton Magnetic Resonance ◽  
Low Field ◽  
New Compounds ◽  
Solid Complexes ◽  
Magnetic Resonance Spectra

Proton magnetic resonance spectra of some complexes of In, Zn, Cd, and Sn halides and perchlorates with N,N-dimethylacetamide (DMA) have been measured in acetone-d6. Low field shifts of the methyl resonances of DMA on complex formation are dependent on metal and anion. The similarity of the spectra of all the complexes suggests only oxygen-coordinated DMA in solution. Infrared spectra in the range 2 000–625 cm−1 are recorded. Changes in the C—O and C—N stretching frequencies of the ligand on coordination are consistent with oxygen-bonded DMA both in the solid complexes and in solution.The new compounds Zn(ClO4)2•6DMA, Cd(ClO4)2•6DMA, CdI2•2DMA, and SnCl4•2DMA are reported.

scholarly journals Complex Formation Between Imidazole and Nickel(II) Salts

1974 ◽  
Vol 29 (7-8) ◽  
pp. 527-531 ◽  
Author(s):  
J. C. Jansen ◽  
J. Reedijk
Keyword(s):  
Complex Formation ◽  
Infrared Spectra ◽  
Coordination Compounds ◽  
Tetragonal Symmetry ◽  
Ligand Field ◽  
X Ray ◽  
Square Planar ◽  
Ligand Field Spectra ◽  
Crystal Field Parameters ◽  
Imidazole Compounds

Coordination compounds of formula Ni(Iz)nX2(H2O)m, in which Iz=imidazole, n = 1, 2, 4, 6, m = 0-4, and X = Cl-, Br-, I- and NCS-, are described. The anhydrous compounds are prepared from ethanolic solutions of Iz and nickel(II) salts in stoichiometric amounts in the presence of the dehydrating agent triethylorthoformate. Without this dehydrating agent hydrates are isolated for n = 2,4 and 6 with X = Cl, Br.The compounds were identified by means of infrared spectra (4000-25 cm-1), ligand-field spectra (35000-4000 cm-1) and X-ray powder diagrams. Compounds of formula [Ni(Iz)6]X2 all contain octahedrally coordinated Ni2+, for which the spectrochemical parameters were obtained. Tetragonal Ni2+ ions occur in [Ni(Iz)4X2] in which X = Cl and NCS, and in [Ni(Iz)4(H2O)2]X2 in which X = Cl and Br. These compounds are paramagnetic and the crystal-field parameters for tetragonal symmetry have been calculated. In [Ni(Iz)4]X2 with X = I and Br, the Ni2+ ions are square-planar coordinated with anions in the second coordination sphere, resulting in orange-coloured diamagnetic compounds.Anion-bridged distorted octahedrally coordinated Ni2+ ions probably occur in the compounds of formula Ni(Iz)2X2, in which Iz takes the axial positions. Similar structures are suggested for the mono-imidazole compounds, NiIzX2.

Synthesis and properties of some formylferrocene thiosemicarbazones

1968 ◽  
Vol 46 (11) ◽  
pp. 1865-1871 ◽  
Author(s):  
D. M. Wiles ◽  
T. Suprunchuk
Keyword(s):  
Absorption Spectra ◽  
Infrared Spectra ◽  
Electronic Absorption ◽  
Copper Complexes ◽  
Electronic Absorption Spectra

Twelve new substituted thiosemicarbazones have been prepared from formylferrocene and 2- and 4-monosubstituted and 4,4-disubstituted thiosemicarbazides. The infrared spectra of these compounds are discussed in some detail. Copper complexes of three of them were synthesized and their structures established. They were found to be strongly paramagnetic. The electronic absorption spectra of the thiosemicarbazones and the copper complexes are reported.

Sign in / Sign up

Export Citation Format

Share Document