Crystal, molecular, and electronic structure of Trans‐bis[ethanone, 1‐(2‐hydroxyphenyl)‐oximato]Nickel(II)

Abstract

The compound [Ni(apo~)~], (where apoxdenotes the anion of 2-hydroxyacetophenoneoxime, C8H8N02-), was prepared and studied by means of spectroscopic (IR, 'H NMR, UV-Vis) measurements and theoretical calculations employing the Hiickel method. The structure was determined by X-ray diffraction studies. The unit cell is monoclinic (space group P21/c)0 with dimensions a = 7.845(1), Keywords: 2-Hydroxyacetophenoneoxime complex; nickel b = 9.911(2), c = 19.371(2) A, ,b'= 94.37(1)" and contains four formula units. Hiickel investigations in comparison with the electronic excitation spectrum revealed that the two bands at 2.73 and 2.62 pm-' can be characterised as MLCT, the band at 1.62 pm-' as d-d transition, while the band at 2.14 cm-' has a mixed character of both MLCT and d-d transition.complex, Ni(CxHgN02)2; crystal structure Kris tall-, Molekularund Elek tronens truktur von Trans-Bis[ e thanon,l-(Zhy drox yphenyl)oximato]nickel( 11) Inhaltsiibersicht. [ N i ( a p~x )~] (apox = Anion des 2-Hydroxy-Z = 4. Hiickel-Rechnungen im Zusammenhang mit dem acetophenonoxims, C8H8NOZ-) wurde dargestellt und durch Elektronenspektrum zeigen, daB die Banden bei 2,73 und spektroskopische Messungen (IR, 'H NMR, UV-Vis) und 2,62 pm-' als MLCT und bei 1,62 pm-l als d-d-Ubergang theoretische Berechnungen mit der Hiickel-Methode unter-charakterisiert werden konnen, wahrend die bei 2,14 pm-' sucht. Die Struktur wurde durch Rontgenstrukturanalyse er-einen gemischten Charakter von MLCT und d-d-Ubergang mittelt. Elementarzelle: monoklin, RaumGruppe P2'/c mit aufweist. a = 7,845(1), b = 9,911(2), c = 19,371(2) A, / I = 94,37(1)",

Crystal structure of trans-bis[2-hydroxy-5-methyl-phenonethanoneoximato- N,O]nickel(II), C18H20N2NiO4

“…Each Ni atom is surrounded by two nitrogen and two oxygen atoms at distances 1.887(2) Â and 1.823(2) À respectively, in a nearly centrosymmetric distorted square-planar arrangement. The fused rings, one chelate and the other cyclic lie in this plane and so for the hydrogens that form quite strong hydrogen bonds [02*-01 2.47 Â (comparable with one of the two respective distances in [4], 02*-H-01 1.7288 À, 0(2)*-H2-0(l) 135.8° and 0 (2) (7) 0.0648 (9) 0.0371 (7) 0.0150 ( …”

“…This conformation explains the strong tension of the crystal to split vertically to this direction. The conformation molecule is trans planar, similar to that of bis(propanone-1 -[2-hydroxyphenyl]oximato)Pd(II) and of bis[ethanone-l-[2-hydroxyphenyl]oximato)Ni(II) structures[4,5].…”

Bis{2-(5-hydroxy-2-[1-(hydroxyimino)ethyl]phenolato-κ2O1,N}nickel(II)N,N-dimethylformamide disolvate

“…For general background to the applications of 2-hydroxyaryloxime complexes in extractive metallurgy and biology, see: Keeney et al (1984); Elo & Lumme (1985); Chaudhuri (2003); Milios et al (2007). For related structures, see: Hatzidimitriou et al (1997); Voutsas et al (1999).…”

“…E65, m1305 [https://doi.org/10.1107/S1600536809039257] (Chaudhuri, 2003;Elo & Lumme, 1985;Keeney et al, 1984;Milios et al, 2007). (Hatzidimitriou et al, 1997), and bis[2-(5-methyl-1-(hydroxyimino)ethyl)phenolato]nickel (Voutsas et al, 1999), have been reported. As a continuation of these studies, the structure of the title complex, (I), is described herein.…”

trans-Bis{2-[1-(hydroxyimino)ethyl]phenolato}cobalt(II)

“…In the title compound, which is isostructural with the corresponding nickel(II) (Hatzidimitriou et al, 1997) and copper(II) (Zhou et al, 1985) complexes, the geometry of the cobalt(II) ion is best described as distorted square-planar. The Co-N bond lengths of 1.889 (3) and 1.892 (3) Å are in agreement with the corresponding distances found in other four-coordinated Co complexes (Fachinetti et al, 1979;Rudolf et al, 1988).…”