Complexes of Cobalt(II), Nickel(II), And Copper Acetates, Perchlorates, and Tetrafluoroborates with Heterocyclic Ligands Containing Va and Via Group Donor Atoms

1975 ◽  
Vol 53 (2) ◽  
pp. 177-185 ◽  
Author(s):  
C. Preti ◽  
G. Tosi
Keyword(s):  
Infrared Spectroscopy ◽  
Metal Ion ◽  
Electronic Spectroscopy ◽  
Far Infrared ◽  
Heterocyclic Ligands ◽  
Free Ions ◽  
Nitrogen Donor ◽  
Molecular Conductance ◽  
Far Infrared Spectra ◽  
Metal Ligand

Cobalt(II), nickel(II), copper(II), and copper(I) acetate, perchlorate, and tetrafluoroborate complexes with thiazolidine-2-thione, thiomorpholin-3-one, and thiomorpholin-3-thione have been prepared. On the basis of infrared and far infrared spectra, electronic spectroscopy, magnetism, and molecular conductance, the stereochemistries of these complexes were identified. Assignments for the metal–ligand modes have also been made. By the use of infrared spectroscopy it has been possible to distinguish whether or not the polyanions present in the complexes are coordinated to the transition metal ion or are present as free ions. Spectroscopic parameters for the complexes have been calculated and compared with similar chromophores containing sulfur, oxygen, and nitrogen donor atoms.

Vibrational and electronic spectra of new liposoluble metalloporphyrins in a nonpolar noncoordinating solvent

1991 ◽  
Vol 69 (7) ◽  
pp. 1070-1079 ◽  
Author(s):  
Michel Ringuet ◽  
Denis Girard ◽  
Camille Chapados
Keyword(s):  
Experimental Data ◽  
Infrared Spectroscopy ◽  
Structural Characteristics ◽  
Electronic Spectroscopy ◽  
Far Infrared ◽  
Covalent Radius ◽  
Far Infrared Spectroscopy ◽  
Normal Coordinate ◽  
Vibrational Bands ◽  
Far Infrared Spectra

A new liposoluble porphyrin, 2,7,12,17-tetrahexyl-3,8,13,18-tetramethylporphin(THTMP), and its complexes with divalent (Mg, Co, Ni, Cu, Zn, Cd, Hg) and trivalent (Mn, Fe) metals have been synthesized. The electronic, infrared, and far-infrared spectra of these compounds were obtained in the same nonpolar, noncoordinating solvent, CCl4. After comparison with the experimental data and the results of normal coordinate analyses from the literature, the assignment of the vibrational bands of THTMP and its complexes is made. Some correlations between the shifts of the metal sensitive bands in the diffferent regions and the structural characteristics of the porphyrin complexes are reported. Some emphasis is made on the magnesium complex in relation to chlorophyll. Key words: Metalloporphyrin, porphyrin, infrared spectroscopy, far-infrared spectroscopy, electronic spectroscopy, nitrogen-metal bond, covalent radius, reduced mass.

Isotopic Studies of the Metal–Ligand Bond. Part III. The Far Infrared Spectra of Some Tetragonal Diamine Complexes of Cobalt(II) and Nickel(II): Studies of the Metal–Nitrogen Bond, as a Function of Metal Ion and of Spin State

1973 ◽  
Vol 51 (10) ◽  
pp. 1567-1581 ◽  
Author(s):  
A. B. P. Lever ◽  
Elvio Mantovani
Keyword(s):  
Infrared Spectra ◽  
Metal Ion ◽  
Far Infrared ◽  
Geometric Factors ◽  
Square Planar ◽  
Isotopic Studies ◽  
First Time ◽  
Far Infrared Spectra ◽  
Metal Ligand ◽  
Nitrogen Bond

The far infrared spectra of 35 complexes of the formula M(diamine)2X2 are reported where M = Co(II) and Ni(II), X = Cl−, Br−, I−, NO3−, SCN−, ClO4−, and AgI2− and the diamine is ethylenediamine or its N,N-symmetric or antisymmetrically substituted dimethyl or diethyl derivative. Isotopic substitution studies with 62Ni and with 2H are carried out with eleven characteristic complexes and assignments for the metal–nitrogen modes in both octahedral and square planar complexes so deduced. In most cases the appropriate number of metal–ligand modes, based on symmetry considerations, are observed. The variations in observed M—N frequencies are discussed in terms of the electronic and geometric factors previously utilized for the corresponding copper(II) complexes. In complexes containing the asymmetric ligands, stretching vibrations arising from the two types of metal–nitrogen bond can be separately identified. Isotopic studies of pairs of complexes containing the same ligand and metal ion but with the latter in alternate spin states are reported here for the first time. All of the cobalt(II) complexes and several of the nickel(II) complexes are reported here for the first time.

Metal Isotope Effect on Metal-Ligand Vibrations. IX. Far Infrared Spectra of Octahedral Nickel Halide Complexes of Pyridine and γ-Picoline

1973 ◽  
Vol 27 (3) ◽  
pp. 213-217 ◽  
Author(s):  
Y. Saito ◽  
C. W. Schläpfer ◽  
M. Cordes ◽  
K. Nakamoto
Keyword(s):  
Isotope Effect ◽  
Infrared Spectra ◽  
Far Infrared ◽  
Isotopic Shifts ◽  
Halide Complexes ◽  
Far Infrared Spectra ◽  
Metal Ligand

The far infrared spectra of Ni (pyridine)4X2 and Ni(γ-picoline)4X2 (X = CI, Br and I) have been measured. The Ni-X and Ni-N stretching bands have been assigned based on isotopic shifts due to the 58Ni-62Ni, pyridine-pyridine-d5, and Cl-37Cl substitutions.

N,N′-Bis(phenylaminomethyl)parabanic add as a complexing agent. Complexes of some bivalent first row transition metals

1977 ◽  
Vol 55 (2) ◽  
pp. 344-349 ◽  
Author(s):  
Antonio Costantino Fabretti ◽  
Gian Carlo Franchini ◽  
Carlo Preti ◽  
Giuseppe Tosi
Keyword(s):  
Nmr Spectra ◽  
Far Infrared ◽  
Complexing Agent ◽  
Ligand Field ◽  
Conductivity Measurements ◽  
B Values ◽  
Nitrogen Bonds ◽  
Ligand Field Parameters ◽  
Far Infrared Spectra ◽  
Metal Ligand

The preparation of some complexes of N,N′-bis(phenylaminomethyl)parabanic acid with halides of cobalt(II), nickel(II), and copper(II) is reported. The complexes of the type MLX2 seem to have pseudo-tetrahedral and pseudo-octahedral symmetry. The complexes have been studied by means of magnetic susceptibility measurements, infrared and far infrared spectra, electronic and nmr spectra, and conductivity measurements. The ligand behaves as bidentate N-bonded. The various ligand field parameters, Dq, B', and β have been evaluated. The B' values suggest a strong covalency in the metal–ligand σ bond and Dq values show a medium strong ligand field. The presence of metal–nitrogen bonds is suggested. The possible stereochemistries of the complexes are discussed in the light of the experimental results.

Fourier transform far-infrared spectroscopy of HN2+ on the AILES beamline of synchrotron SOLEIL

2013 ◽  
Vol 91 (11) ◽  
pp. 937-940 ◽  
Author(s):  
S. Gruet ◽  
A. Morvan ◽  
O. Pirali ◽  
T. Chamaillé ◽  
E. Bouisset ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Broad Band ◽  
Far Infrared ◽  
Far Infrared Spectroscopy ◽  
Pure Rotation ◽  
Frequency Tunable ◽  
Discharge Cell ◽  
Rotation Spectrum ◽  
Far Infrared Spectra

We report the pure rotation spectrum of HN2+ as measured by Fourier transform (FT) absorption spectroscopy in the 20–40 cm−1 spectral range. The cations are produced in a liquid nitrogen cooled hollow cathode discharge cell developed on the AILES beamline of synchrotron SOLEIL. The setup was optimized by recording rotation–vibration spectra of H3+ (with the ν2 band centered at about 2521 cm−1), HN2+ (with the ν1 band centered at about 3234 cm−1), and HCO+ (with the ν1 band centered at about 3089 cm−1). Many rotation–vibration lines have been assigned for each ion and five pure rotational transitions have been detected for HN2+. These results demonstrate the feasibility of recording far-infrared spectra of cationic species using FT broad band spectroscopy associated with the bright synchrotron radiation continuum as an alternative to laser-based frequency tunable techniques.

scholarly journals Study of the Reactions of Chromium(III) Halides and Heterocyclic Ligands Containing Group VA and VIA Donor Atoms

1974 ◽  
Vol 52 (16) ◽  
pp. 2845-2850 ◽  
Author(s):  
C. Preti ◽  
G. Tosi
Keyword(s):  
Electronic Spectroscopy ◽  
Far Infrared ◽  
Conductivity Measurements ◽  
Heterocyclic Ligands ◽  
Spectroscopic Parameters

Complexes of thiomorpholin-3-one, thiomorpholin-3-thione, thiazolidine-2-thione, and thiazolidine-2-selenone with CrX3•nH2O (X = Cl, Br, I) were prepared and characterized. On the basis of vibrational (conventional and far infrared) and electronic spectroscopy, magnetism and conductivity measurements, the structures of these complexes were identified. The bonding occurs through the oxygen in the complexes of thiomorpholin-3-one and through the nitrogen in all the remaining complexes. The complexes crL3x3 involve unidentate ligands, are neutral, monomeric, and hexacoordinate. Spectroscopic parameters for the complexes have been calculated and compared with similar chromophores containing CrN3X3, CrO3X3, and CrS3X3 chromophores.

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