Five-coordinate metal(II) complexes based pyrazolyl ligands.

Salah S. Massoud, Febee R. Louka, Regan N. David, Merlin J. Dartez, Quang L. Nguyn, Nicholas J. Labry, Roland C. Fischer, Franz A. Mautner

Publikation: Beitrag in einer FachzeitschriftArtikel

Abstract

The reactions of pyrazole based ligands with M(II) perchlorate hexahydrate in the presence of NH4NCS afforded the mononuclear complexes [Co(Bzbedmpza)(NCS)2]·3/4CH3COCH3 (1), [Ni(Bzbedmpza)(NCS)2] (2), [Cu(Bzbedmpza)(NCS)2] (3) and [Cu(Mebedmpza)(NCS)2] (4), and in the presence of NaN3, the complex [Cu(tedmpza)(N3)]ClO4 (5) was isolated where Bzbedmpza = N-benzyl-bis(3,5-dimethyl-2-(pyrazol-1H-yl)ethyl)amine, Mebedmpza = N-methyl-bis(3,5-dimethyl-2-(pyrazol-1H-yl)ethyl)amine and tedmpza = tris(2,5-dimethyl-ethyl-pyrazol-1H-yl)amine. The complexes were structurally characterized by elemental microanalyses, IR and UV-visible spectroscopy and by single crystal x-ray crystallog. The complexes 2-5 display distorted SP geometry, whereas the cobalt(II) complex 1 has a distorted TBP. Also, all the thiocyanato complexes 1-4 are coordinated to the central metal ions through N-terminal thiocyanate. The stability of any of the two possible limiting geometries (SP vs. TBP) including nature of the central metal ion and the structural parameters of the amine coligands (steric effect, nature of chelate ring sizes and skeleton of the coligand) are analyzed as a function of τ values. [on SciFinder(R)]
Originalspracheenglisch
Seiten (von - bis)258-265
Seitenumfang8
FachzeitschriftPolyhedron
Jahrgang90
DOIs
PublikationsstatusVeröffentlicht - 2015

Schlagwörter

  • metal geometry transition metal allyl pyrazolyl amine complex
  • crystal structure transition metal allyl pyrazolyl amine complex prepn

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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