Divalent manganese, cobalt and nickel chloride complexes with neutral N 2 - and N 3 -based ligands derived from 2-pyridinecarbaldehyde: Synthesis, structural features and spectroscopic studies

Polyhedron ◽  
2016 ◽  
Vol 105 ◽  
pp. 238-245 ◽  
Author(s):  
Elena A. Buvaylo ◽  
Andrii K. Melnyk ◽  
Vladimir V. Trachevsky ◽  
Olga Yu. Vassilyeva ◽  
Brian W. Skelton
Keyword(s):  
Nickel Chloride ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Chloride Complexes ◽  
Cobalt And Nickel

scholarly journals There are two major types of skeletal keratan sulphates

1990 ◽  
Vol 271 (1) ◽  
pp. 243-245 ◽  
Author(s):  
I A Nieduszynski ◽  
T N Huckerby ◽  
J M Dickenson ◽  
G M Brown ◽  
G H Tai ◽  
...  
Keyword(s):  
Intervertebral Disc ◽  
Nasal Septum ◽  
High Field ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Neuraminic Acid ◽  
Keratan Sulphate

High-field 1H-n.m.r.-spectroscopic studies supported by chemical carbohydrate analyses show that skeletal keratan sulphates (KS-II) of bovine origin may be sub-classified into two groups. Keratan sulphate chains from articular and intervertebral-disc cartilage (KS-II-A) contain two structural features, namely alpha(1----3)-fucose and alpha(2----6)-linked N-acetyl-neuraminic acid residues, that are absent from keratan sulphates from tracheal or nasal-septum cartilage (KS-II-B).

Infrared Spectroscopic Studies of Thin Polyaniline Films

1990 ◽  
Vol 210 ◽  
Author(s):  
Carol Korzeniewski ◽  
David M. Seeger
Keyword(s):  
Spectroscopic Study ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Infrared Spectroscopic Study ◽  
Infrared Spectroscopic ◽  
Polyaniline Films

AbstractThe electrochemistry of polyaniline depends upon the pH of the deposition solution and the nature of the anion present during deposition. When the pH of the deposition solution is below 1.0, the response is typical of the para-substituted phenyleneamine structure. When the pH of the deposition solution is greater than 1.0, an additional voltammetric wave appears, and the response is a function of the dopant anion. This report presents results of an in situ infrared spectroscopic study aimed at elucidating structural features which determine the anion dependent voltammetric response.

scholarly journals Spectroscopic studies of benzoxazole-2-thione complexes. Derivatives of cobalt(II) and nickel(II) halides

1976 ◽  
Vol 54 (1) ◽  
pp. 85-90 ◽  
Author(s):  
Carlo Preti ◽  
Giuseppe Tosi
Keyword(s):  
Magnetic Susceptibility ◽  
Ir Spectra ◽  
Electronic Spectra ◽  
Spectroscopic Studies ◽  
Ligand Field ◽  
Conductivity Measurements ◽  
Derivatives Of ◽  
Ligand Field Parameters ◽  
Cobalt And Nickel

The preparation of some complexes of benzoxazole-2-thione with halides of cobalt(II) and nickel(II) is reported. The complexes of cobalt(II) and nickel(II) are tetrahedral of the type ML2X2 with the exception of NiLBr2. The complexes have been studied by means of magnetic susceptibility measurements, infrared and far ir spectra, electronic spectra, and conductivity measurements. The ligand behaves as monodentate N-bonded. The various ligand field parameters, Dq, B′, and β show about 60 and 80% of covalency in the cobalt(II) and nickel(II) complexes respectively and suggest a medium strong ligand field. The spectroscopy parameters of cobalt and nickel derivatives confirm the presence of CoN2X2 and NiN2X2 chromophores.

Chelated compounds and derivative of β-alkoxycarbonylalkyltin chlorides — 5-arylazo-8-quinolinolates, alizarinates, and thiocyanate: preparation and spectroscopic studies

1987 ◽  
Vol 65 (6) ◽  
pp. 1241-1246 ◽  
Author(s):  
Barun Kanti Deb ◽  
Amiya Kanti Ghosh
Keyword(s):  
Complex Formation ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Nucleophilic Attack ◽  
Hydroxyl Groups ◽  
Chelating Ligands ◽  
Carbonyl Groups ◽  
H Nmr ◽  
Elemental Analyses ◽  
Subsequent Elimination

Complex formation with chelating ligands like 5-phenylazo-8-quinolinol, 5-(2I-carboxyphenylazo)-8-quinolinol, 1,2-dihydroxyanthraquinone (i.e., alizarin), and 1-nitroso-2-naphthol is due to nucleophilic attack on tin of the β-alkoxycarbonylalkyltin chlorides (a unique class of PVC stabilizer intermediates) with the subsequent elimination of hydrogen chloride. A number of complexes of the types R2SnL2, RSnL2Cl, R2SnLCl, R2Sn(LIHI)2, R2SnLII, and RSnLIICl (where R = CH3OCOCH2CH2—, C4H9OCOCH2CH2—, and CH3OCOCH(CH3)CH2—; LH = 5-phenylazo-8-quinolinol, 1-nitroso-2-naphthol; LIHHI = 5-(21-carboxyphenylazo)-8-quinolinol; and LIIH2 = 1,2-dihydroxyanthraquinone) and a thiocyanate derivative viz. (CH3OCOCH2CH2)2Sn(SCN)2 have been prepared. 5-Arylazo-8-quinolinols exhibit azo–hydrazone tautomeric equilibria but their complexes exist only in the azo form. β-Alkoxycarbonylethyltin alizarinates are somewhat different from other complexes. In these complexes two hydroxyl groups of alizarin have been utilised in complex formation, moreover, one of the two carbonyl groups of alizarin also remains involved in coordination to tin. In (CH3OCOCH2CH2)2Sn(SCN)2, the thiocyanate group is possibly linked to tin atom through nitrogen. All the complexes and the thiocyanate derivative have been characterised by elemental analyses, electronic, ir, and 1H nmr spectra. Possible structural features of the compounds are discussed.

Taxol interaction with DNA and RNA — Stability and structural features

2004 ◽  
Vol 82 (6) ◽  
pp. 1112-1118 ◽  
Author(s):  
A Ahmed Ouameur ◽  
H Malonga ◽  
J F Neault ◽  
S Diamantoglou ◽  
H A Tajmir-Riahi
Keyword(s):  
Capillary Electrophoresis ◽  
Binding Site ◽  
Binding Constant ◽  
Lung Tumor ◽  
Rna Stability ◽  
Structural Features ◽  
Spectroscopic Studies ◽  
Dna And Rna ◽  
Helix Stability

Taxol (paclitaxel) is an anticancer drug that interacts with microtubule proteins in a manner that catalyzes their formation from tubulin and stabilizes the resulting structures. However, in the human lung tumor cell, the concentration of paclitaxel is highest in the nucleus. Therefore, it was of interest to examine the interaction of taxol with DNA and RNA in aqueous solution at physiological pH. Capillary electrophoresis and Fourier transform infrared (FTIR) difference spectroscopic methods were used to characterize the nature of drug–DNA and drug–RNA interactions and to determine the taxol binding site, the binding constant, the sequence selectivity, the helix stability, and the biopolymer secondary structure in the taxol–polynucleotide complexes in vitro. The FTIR spectroscopic studies were conducted with taxol/polynucleotide (phosphate) ratios of 1/80, 1/40, 1/20, 1/10, 1/4, and 1/2 with a final DNA(P) or RNA(P) concentration of 12.5 mmol/L, and capillary electrophoresis was performed after incubation of taxol with polynucleotides at ratios of 1/200 to 1/12 with a final polynucleotide concentration of 1.25 mmol/L. Taxol was shown to bind to DNA and RNA at G–C, A–T, or A–U bases and the backbone PO2 group. Two types of binding were observed for taxol–DNA with K1 = 1.3 × 104 L mol–1 and K2 = 3.5 × 103 L mol–1, whereas taxol–RNA complexes showed one type of binding with K = 1.3 × 104 L mol–1. The taxol–polynucleotide complexation is associated with a partial helix stabilization and no major alterations of B-DNA or A-RNA structure. Key words: DNA, RNA, taxol, binding site, binding constant, conformation, helix stability, electrophoresis, FTIR spectroscopy.

Structural and spectroscopic studies of Au(III) and Pd(II) chloride complexes and organometallics with 2-benzylpyridine

2013 ◽  
Vol 1032 ◽  
pp. 195-202 ◽  
Author(s):  
Daria Niedzielska ◽  
Tomasz Pawlak ◽  
Maria Bozejewicz ◽  
Andrzej Wojtczak ◽  
Leszek Pazderski ◽  
...  
Keyword(s):  
Spectroscopic Studies ◽  
Chloride Complexes
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