Coordination Behaviour of a Pyrazole-Based Carboxamide, a Potential Substitute for ‘Coromine’ : Cobalt(II), Nickel(II) and Copper(II) Complexes of N,N-Diethyl-5(3)-methyl Pyrazole-3(5)-carboxamide
01 Jan 1984-Synthesis and Reactivity in Inorganic and Metal-organic Chemistry (Taylor & Francis Group)-Vol. 14, Iss: 5, pp 731-751
TL;DR: In this paper, it was shown that the halo-complexes of Co(II) are mixtures of both tetrahedral and octahedral forms at least in the solid state while, the nickel and the rest of the cobalt species are normal pseudo-octahedral ones.
Abstract: N,N-Diethyl-5(3)-methyl pyrazole-3(5)-carboxamide (MPDA) forms bis-complexes of the type M(MPDA)2X2·nH2O [M = Co/Ni/Cu; X = Cl/Br/I/SCN/ y2SO4/NO3/ClO4/BF4-] which have been characterised by physico-chemical methods. Electronic spectral features indicate that the halo-complexes of Co(II) are mixtures of both tetrahedral and octahedral forms at least in the solid state while, the nickel(II) and the rest of the cobalt(II) species are normal pseudo-octahedral ones. The copper(II) complexes are assigned to have the usual octahedral configuration in the context of the present data; the Dq values of Co(II), Ni(II) and Cu(II) complexes, however, are consistent with the position of these ions in the spectrochemical series. IR data point out the pyrazolyl ring nitrogen and the amide oxygen as the probable coordination sites, showing the neutral bidentate (NO) function of the title ligand.
Citations
More filters
764 citations
TL;DR: In this article, the geometries of the Ni(II) complexes have been found to be dependent on the counterion (X) present in the species Ni(DMPTA)X2(X2 = (X = N03, 1/2S04, C104) which are diamagnetic with a square planar configuration.
Abstract: N, N-Diethyl-5(3)-methylpyrazole-5(5)-thiocarboxamide (DMPTA) forms solid bis-complexes of the type M(DMPTA)2X2.nH20 [M = Co/Ni/Cu; X = a counter ion like Cl/Br/SCN/ 1/2S04/N03/C104/BF/] which have been physico-chemically characterised. Electronic spectral features indicate the chloro- and thiocyanato Co(II) complexes as mixtures of both octahedral and tetrahedral species both in solid and in solution, whereas the rest of the Co(II) complexes are pseudo-octahedral, as is also supported by LF parameters. The geometries of the Ni(II) complexes have been found to be dependent on the counterion (X) present in the species Ni(DMPTA)X2(X2 = (X = N03, 1/2S04, C104) which are diamagnetic with a square planar configuration, while with X = Cl, Br, SCN, the complexes [Ni(DMPTA)X2] are pseudooctahedral. All Cu(II) complexes have distorted octahedral structures. IR data point out the pyra-zolyl ring nitrogen and the sulphur atom of the thioamide residue as the probable coordination sites, showing neutral biden...
4 citations
TL;DR: In this paper, a series of cobalt(II), nickel(II) and copper (II) complexes of 2-picolinamineNoxide, HA, has been prepared.
Abstract: A series of cobalt(II), nickel(II) and copper(II) complexes of 2-picolinamineN-oxide, HA, has been prepared. Solids of formula [M(HA)3](BF4)2 (M=cobalt(II) or nickel(II); [Cu(HA)2]X2 (X=BF4−, NO3−); [Co(HA)2X2] (X=Cl− or Br−); [Ni(HA)2Cl2] and [Cu(HA)X2] (X=Cl− or Br−] have been isolated and characterized by partial elemental analyses, molar conductivities, magnetic susceptibilities, DSC-TGA, and spectral methods. All complexes were found to be monomeric, and their spectral parameters are compared with those of the metal ion complexes ofN-alkyl-2-picolinamineN-oxides, 2-dialkylaminopyridineN-oxides and 2-picolinamine. The cobalt(II) and nickel(II) halide complexes spectrally show a mixture of octahedral and tetrahedral centres.
2 citations
References
More filters
Book•
01 Jan 1999
TL;DR: Cotton and Wilkinson's Advanced Inorganic Chemistry (AIC) as discussed by the authors is one of the most widely used inorganic chemistry books and has been used for more than a quarter century.
Abstract: For more than a quarter century, Cotton and Wilkinson's Advanced Inorganic Chemistry has been the source that students and professional chemists have turned to for the background needed to understand current research literature in inorganic chemistry and aspects of organometallic chemistry. Like its predecessors, this updated Sixth Edition is organized around the periodic table of elements and provides a systematic treatment of the chemistry of all chemical elements and their compounds. It incorporates important recent developments with an emphasis on advances in the interpretation of structure, bonding, and reactivity.From the reviews of the Fifth Edition:* "The first place to go when seeking general information about the chemistry of a particular element, especially when up-to-date, authoritative information is desired." -Journal of the American Chemical Society.* "Every student with a serious interest in inorganic chemistry should have [this book]." -Journal of Chemical Education.* "A mine of information . . . an invaluable guide." -Nature.* "The standard by which all other inorganic chemistry books are judged."-Nouveau Journal de Chimie.* "A masterly overview of the chemistry of the elements."-The Times of London Higher Education Supplement.* "A bonanza of information on important results and developments which could otherwise easily be overlooked in the general deluge of publications." -Angewandte Chemie.
12,231 citations
8,264 citations
Book•
01 Jan 1962
TL;DR: This chapter introduces the theory of transition metal chemistry and its applications in ligand field theory and discusses the role of uranium in this theory.
Abstract: INTRODUCTION TO LIGAND FIELD THEORY BY CARL J. INTRODUCTION TO LIGAND FIELD THEORY VIDEO DAILYMOTION. INTRODUCTION TRANSITION METAL CHEMISTRY LIGAND FIELD THEORY. LIGAND FIELD THEORY WWWCHEM UWIMONA EDU JM. CHAPTER 23 INTRODUCTION TO THE TRANSITION ELEMENTS LIGAND. WILEY LIGAND FIELD THEORY AND ITS APPLICATIONS BRIAN N. CARL J BALLHAUSEN INTRODUCTION TO LIGAND FIELD THEORY. INTRODUCTION TO LIGAND FIELD THEORY
1,890 citations