scholarly journals Copper(II) derivatives of the stereochemically adaptive ligands 1,2-bis(2′-pyridyl)ethane and bis(2-pyridyl)disulfide

1970 ◽  
Vol 48 (20) ◽  
pp. 3185-3192 ◽  
Author(s):  
M. Keeton ◽  
A. B. P. Lever ◽  
B. S. Ramaswamy
Keyword(s):  
Low Temperature ◽  
Vibrational Spectroscopy ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Structural Types ◽  
Distorted Octahedral ◽  
Derivatives Of

Tetrahedral, square, square pyramidal, and tetragonally distorted octahedral complexes of copper(II) with the title ligands are characterized by electronic and vibrational spectroscopy (at ambient and low temperature) and magnetism. The infrared spectra are utilized to infer information about the conformation of the ligands in these complexes. The variation in structural types observed is believed to be a consequence of the stereochemical adaptability of these ligands to the electronic demands of the metal ion.

Hydrogen sulphide – halogen complexes studied by matrix isolation vibrational spectroscopy

1985 ◽  
Vol 63 (7) ◽  
pp. 1705-1707 ◽  
Author(s):  
U. P. Agarwal ◽  
A. J. Barnes ◽  
W. J. Orville-Thomas
Keyword(s):  
Low Temperature ◽  
Vibrational Spectroscopy ◽  
Infrared Spectra ◽  
Hydrogen Sulphide ◽  
Matrix Isolation ◽  
Reaction Products ◽  
Hydrogen Halides ◽  
Stretching Vibration

Infrared spectra are reported of mixtures of hydrogen sulphide with chlorine or bromine in low-temperature argon or nitrogen matrices. The H2S … Cl2 and H2S … Br2 complexes were identified from the perturbed halogen stretching vibration. Absorptions due to the corresponding hydrogen halides provided evidence that reaction was occurring between the hydrogen sulphide and halogen (despite the use of a twin-jet deposition), and other reaction products were tentatively identified from the observed absorptions.

Thio derivatives of β-diketones and their metal chelates. VI. Metal chelates of 3-Mercapto-1,3-diphenylprop-2-en-1-one and their infrared spectra

1967 ◽  
Vol 20 (6) ◽  
pp. 1065 ◽  
Author(s):  
SHH Chaton ◽  
SE Livingstone
Keyword(s):  
Metal Complexes ◽  
Infrared Spectra ◽  
Metal Ion ◽  
Free Ligand ◽  
Carbonyl Oxygen ◽  
Metal Chelates ◽  
The Other ◽  
Methyl Derivative ◽  
Derivatives Of

Complexes of 3-mercapto-1,3-diphenylprop-2-en-1-one, PhC(SH)=CHCOPh, with iron(III), cobalt(III), rhodium(III), nickel(II), palladium(II), platinum(II), copper(II), silver(I), zinc(II), cadmium(II), and mercury(II) have been prepared and characterized. Complexes of 4- mercaptopent-3-en-2-one, MeC(SH)=CHCOMe, with cobalt(III) and cadmium(II) and of ethyl thioacetoacetate, MeC(SH)=CHCOOEt, with cobalt(III) and copper(I) are also reported. The infrared spectra of the complexes of 3-mercapto-1,3- diphenylprop-2-en-1-one are discussed. The similarity of the spectra of the silver(I), cadmium(II), and mercury(II) complexes to those of the free ligand and its S-methyl derivative, PhC(SMe)=CHCOPh, indicate that in these three complexes the carbonyl oxygen of the ligand is not, or is at most weakly, coordinated to the metal ion. The assignments of the principal bands in the other metal complexes of this ligand are: 1550- 1525 cm-1, v(C-C); 1480-1458 cm-1, v(C=O); 1438-1412 cm-1, v(C=O)+δ(C-H); 1270-1260 cm-1, v(C--S); 498-437 cm-1, v(M-O); 399-376 cm-1, v(M-S).

Thio derivatives of β-diketones and their metal chelates. I. Some Monothio-β-diketones and their nickel(II) chelates

1965 ◽  
Vol 18 (5) ◽  
pp. 673 ◽  
Author(s):  
SHH Chaston ◽  
SE Livingstone ◽  
TN Lockyer ◽  
VA Pickles ◽  
JS Shannon
Keyword(s):  
Low Temperature ◽  
Metal Complexes ◽  
Infrared Spectra ◽  
Hydrogen Sulphide ◽  
Mass Spectrometric ◽  
Dilute Solution ◽  
Nickel Chelates ◽  
Derivatives Of ◽  
Diethyl Dithiophosphate ◽  
Yellow Compound

Monothio-β-diketones of general formula RC(SH)=CHCOR? (R = Me, R* = Me, Ph, OEt; R = Ph, R' = Ph, OEt; R = α-thienyl, R' = CF3; and 12 = R' = CMe,) have been prepared in order to study their metal complexes. Five of these thio derivatives are new and were prepared by treatment of a dilute solution of the corresponding β-diketone in alcohol with hydrogen sulphide at low temperature. Mass spectrometric examination has established the structures of MeC(SH)=CHCOPh and RC(SH)=CHCOCF, (R = α-thienyl). The red compounds PhC(SH)=CHCOPh (VI) and MeC(SH)=CHCOPh (V) can be oxidized to yellow products. The structure of the yellow compound (XV) obtained from (VI) was established by mass and n.m.r. spectroscopy as the disulphide PhCOCH=C(Ph)SSC(Ph)=CHCOPh. The molecular ion of (XV) undergoes novel rearrangement reactions involving, inter alia, elimination of H2S to produce a thiophene ion. The nickel chelates Ni(RCS=CHCOR')2 are brown, diamagnetic, and soluble in organic solvents. Unstable paramagnetic bis-pyridine adducts, derived from two of the nickel chelates, were isolated. The infrared spectra of the monothio-β-diketones and their nickel chelates are reported. The spectra of the monothio-β-diketones show no SH band at c. 2570 cm-1 ; this indicates strong chelation of the thiol hydrogen between the sulphur and oxygen atoms. The monothio-β-diketones display four characteristic bands which are assigned as follows : 1670-1590 cm-1, v(C--O) ; 1638-1530 cm-1, v(C=C) ; 1267-1190 cm-1, v(C=S) ; 837-805 cm-1, provisionally assigned as v(C=S) + δ(C-H). The nickel chelates exhibit five characteristic bands: 1590-1535 cm-1, V(C=C); 1542-1477 cm-1, v(C-0); 1261-1220 cm-1, v(C--S); 817-800 cm-1, provisionally assigned to v(C-S)+ δ(C-H); 499-451 cm-1, v(Ni-O). No band corresponding to v(Ni-S) was detected above 250 cm-1. However, the metal-sulphur stretching frequency was observed as a peak of medium intensity within the range 360-308 cm-1 in the spectra of bis(o-methylthiobenzenethiolo)-nickel(II) and the diethyl dithiophosphate complexes of nicke1(II), palladium(II), chromium(III), and cobalt(III).

X-ray Structure Refinement and Vibrational Spectroscopy of Ca8Gd2 (PO4)6 O2

2013 ◽  
Vol 12 (10) ◽  
pp. 719-726
Author(s):  
R. Ayadi ◽  
Mohamed Boujelbene ◽  
T. Mhiri
Keyword(s):  
Solid State ◽  
General Formula ◽  
Vibrational Spectroscopy ◽  
Powder Diffraction ◽  
Infrared Spectra ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Unit Cell ◽  
Cell Group ◽  
X Ray

The present paper is interested in the study of compounds from the apatite family with the general formula Ca10 (PO4)6A2. It particularly brings to light the exploitation of the distinctive stereochemistries of two Ca positions in apatite. In fact, Gd-Bearing oxyapatiteCa8 Gd2 (PO4)6O2 has been synthesized by solid state reaction and characterized by X-ray powder diffraction. The site occupancies of substituents is0.3333 in Gd and 0.3333 for Ca in the Ca(1) position and 0. 5 for Gd in the Ca (2) position.  Besides, the observed frequencies in the Raman and infrared spectra were explained and discussed on the basis of unit-cell group analyses.

Infrared Spectra of Some Chloro Derivatives of s-Triazine

1966 ◽  
Vol 20 (3) ◽  
pp. 159-160 ◽  
Author(s):  
T. S. Herman
Keyword(s):  
Infrared Spectra ◽  
Triazine Ring ◽  
Chlorine Atoms ◽  
Vibrational Assignments ◽  
Fundamental Frequencies ◽  
Bending Mode ◽  
Chloro Derivatives ◽  
Derivatives Of

The effects of chlorine atoms on the fundamental frequencies of the s-triazine ring are discussed and the vibrational assignments in the region 1600–700 cm−1 are extended. The variation in the position of the C3N3-ring bending mode in the region near 810 cm−1 is discussed.

Infrared spectra of some derivatives of unsaturated phosphinic acids

1961 ◽  
Vol 10 (1) ◽  
pp. 62-66 ◽  
Author(s):  
N. A. Slovokhotova ◽  
K. N. Anisimov ◽  
G. M. Kunitskaya ◽  
N. E. Kolobova
Keyword(s):  
Infrared Spectra ◽  
Phosphinic Acids ◽  
Derivatives Of

The Through-Bond Interaction of a Sulfur Lone Pair with Oxygenated Substituents in the Thiacyclohexane Framework

2005 ◽  
Vol 58 (7) ◽  
pp. 531
Author(s):  
Laura Andrau ◽  
Jonathan M. White
Keyword(s):  
Low Temperature ◽  
Crystal Structures ◽  
Bond Distance ◽  
Lone Pair ◽  
X Ray ◽  
Ester Derivative ◽  
Bond Interaction ◽  
Derivatives Of ◽  
Electron Demand

Low-temperature X-ray crystal structures were determined on a range of derivatives of 4-thiacyclohexanol 5a of varying electron demand with a view to finding evidence for a through-bond interaction between the sulfur lone pair and the oxygenated substituent. In contrast to earlier suggestions, plots of C–OR bond distance versus pKa (ROH) showed that any interaction between the sulfur and the OR group is unlikely to be of a through-bond origin. Furthermore, unimolecular solvolysis rate measurements on the nosylate ester derivative 5g showed that the sulfur actually retards the reaction slightly in comparison with the corresponding sulfur-free analogue 6.

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