Synthesis and structure of tetracoordinated nickel(II) complexes of deprotonated chelated aminoazo ligands: X-ray crystal structure of bis[1-isopropyl-3-methyl-4-(4-methylphenylazo)-5-(4-methoxyphenylamidato)pyrazole] nickel(II) View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1994-06

AUTHORS

Alexander L. Nivorozhkin, Hans Toftlund, Leonid E. Nivorozhkin, Irina A. Kamenetskaya, Alla S. Antsishkina, Michail A. Porai-Koshits

ABSTRACT

Tetracoordinate nickel(II) complexes NiL2 derived from the deprotonated forms of aminoazoligands HL were prepared and investigated by spectroscopy and magnetic susceptibility measurements. The magnetic moments, which lie in the 3.1–3.6 B.M. range correspond to the occurrence both in solution and in the solid state of the high spin (S = 1) form and a tetrahedral configuration at the metal centre. The u.v. spectra exhibit three ligand field bands at 1020–1280 nm characteristic of high spin nickel(II) complexes. The large isotropic chemical shifts found in the 1H n.m.r. spectra are consistent with partial delocalization of unpaired electron spin density to the ligand HOMO. The X-ray single crystal structure of NiL24[L4= 1-isopropyl-3-methyl-4-(4-methylphenylazo)-5-(4-methoxyphenylamino)-pyrazole] reveals that the metal is coordinated by four nitrogen atoms in tetrahedral configuration with an angle of 90° between the N(1)NiN(2) and N(6)NiN(7) planes belonging to the different almost planar metallocycles. The rates of R⇄S interconversion of the tetrahedral configuration for NiL24and NiL25[L5 = 1-isopropyl-3-methyl-4-phenylazo-d5-5-(4-methoxyphenylamino)pyrazole] are slow on the n.m.r. timescale. In contrast to NiL21-Ni26, NiL27], which contains coordinated NH-groups instead of NAr-groups, is planar. More... »

PAGES

319-324

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00139103

DOI

http://dx.doi.org/10.1007/bf00139103

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042354217


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