Journal ArticleDOI
Thermochemistry of some complexes of chromium(III) with imidazoles
M. Sánchez,J. Losada +1 more
TLDR
In this article, the thermal decomposition in air of several complexes of chromium(III) with imidazole, N-methylimidazoles, and 2-Methylimideazole has been studied with the aid of differential thermal analysis (DTA), thermogravimetry (TG), and derivative thermograves (DTG) in the temperature range 25-600°C.Abstract:
The thermal decomposition in air of several complexes of chromium(III) with imidazole,N-methylimidazole and 2-methylimidazole has been studied with the aid of differential thermal analysis (DTA), thermogravimetry (TG) and derivative thermogravimetry (DTG) in the temperature range 25–600°C. Although the final process of the decomposition gives Cr2O3, there are interesting differences in the complete process of decomposition. The reasons for these differences appear to be related to the trans-effect and to the presence in the imidazole complexes of hydrogen bonds. Enthalpies of the several decomposition reactions have been determined by differential thermal analysis.read more
Citations
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Journal ArticleDOI
Novel Chromium (III) Complexes Containing Imidazole-Based Chelate Ligands with Varying Donor Sets: Synthesis and Reactivity
TL;DR: In this paper, the reaction of tri-and bidentate bis(N-methylimidazole-2-yl) ligands gave the new Cr(III) complexes [Cr(N∧N ∧Y)Cl3] (3a−c), [Cr (N∩N)Cl 3]2 (4a −c), and [CrMe)(N ∩N∞Cl2] (5a,b) in ≥90% yield.
Journal ArticleDOI
Synthesis, characterisation and catalytic behaviour of a novel class of chromium(III) and vanadium(III) complexes containing bi- and tri-dentate imidazole chelating ligands: a comparative study
TL;DR: In this article, the synthesis and characterisation of tri-and bi-dentate coordinated chromium-III and vanadium-III complexes of the general composition is described.
Journal ArticleDOI
Thermal and structural studies of amide complexes of transition metal(II) chlorides. I: Stoichiometry
TL;DR: In this paper, a series of aliphatic amide complexes of nickel(II), cobalt(II) and copper (II) chlorides has been prepared and the effects of the structure and the nature of the different amide ligands on the thermal stabilities of the complexes have been investigated by thermal analysis.
Journal ArticleDOI
Chromium(III)-pyrazole complexes. X-Ray crystal structures, 1H NMR investigation of ligand fluxional behavior and EPR studies
TL;DR: In this paper, the fluxional behavior of the pyrazole tautomerization was probed by variable temperature 1H NMR spectra in −50°C to +23°C range and activation parameters were derived.
References
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Book
Comprehensive inorganic chemistry
TL;DR: In this article, the transition elements involving metal-metal bonds are defined and an introductory essay is given, along with a discussion of homogeneous catalysis and transition metal chemistry, B L Shaw & N I Tucker.
Journal ArticleDOI
Cobalt(II), nickel(II), and copper(II) complexes of imidazole and thiazole
TL;DR: In this paper, the spectral and magnetic properties of the Co(imidazole)6X2 and Ni(thiazole)4Cl2 and Cu(thizolatonickel)2Cl2 are reported.
Journal ArticleDOI
Spectres de vibration de l’imidazole, de l’imidazole (D)-1, de l’imidazole (D3)-2,4,5 et de l’imidazole (D4) - Partie I : Région entre 4 000 et 1 700 cm–1
TL;DR: In this paper, the authors propose an attribution of frequences fondamentales de l'imidazole situees entre 1 700 and 250 cm-1. But they do not consider the effect of vibrations externes on absorption.
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