Structure of triaqua[N-(5-bromosalicylidene)-L-tryptophanato]nickel(II) dihydrate

Abstract

Abstract. [Ni(C18H13BrN203)(H20)3].2H20, Mr = 534-0, monoclinic, P21, a = 7.379 (1), b = 7.63, (1), c =19-981(3) A, fl=99-29(1) °, V=llll.I(2)A 3, Dx =1.59/~cm -3, Z=2, F(000)=544, Cu Ka, A= 1-5418 A,/z = 37.7 cm-l, room temperature. Final R = 0.051, wR = 0.050 for 1811 observed reflections. The structure consists of discrete molecules of the complex, with the Ni n ion octahedrally coordinated to one terdentate Schiff-base moiety and three water molecules; there are two additional non-coordinated water molecules in the asymmetric unit. The crystal structure is supported by a network of hydrogen bonds, involving water molecules and the phenolic and carboxylic O atoms.Introduction. The magnetic properties of complexes of N-salicylidene-L-amino acids with transition-metal ions have been extensively investigated by variabletemperature magnetic susceptibility measurements and ESR spectroscopy. These compounds exhibit a wide range of magnetic and spectroscopic properties and have been described as monomers, dimers and

rac-catena-Poly[nickel(II)-di-μ-tryptophanato]

“…For related literature, see: Cai et al (2000); Cheng et al (2005); Henrick et al (1978); Kumita et al (2001); Rodríguez et al (1990); Wu et al (2004); Zhang et al (2005); Zhou et al (2005).…”

Triaqua(5-formyl-N-salicylidene-DL-alaninato-κ3N,O,O′)nickel(II) monohydrate

“…For the structures of salicylidene-glycine-nickel complexes, see Cui et al (1992Cui et al ( , 1993; Rodríguez et al (1990).…”

“…The 3-methoxy analog also affords a six-coordinate tripyridine complex, but it also contains ethanol as the solvate molecule (Cui et al, 1993). The N-(5-bromosalicylidene)tryptophanate complex is a triaqua complex that crystallizes with two uncoordinated water molecules (Rodríguez et al, 1990).…”

Synthesis, spectroscopic and electrochemical characteristics of a novel Schiff-base from saccharin and tryptophan

“…Limited information has been reported on Schiff-bases of saccharin [18,19] and tryptophan [20][21][22][23][24] in the literature. However, a novel Schiff-base of cysteine and saccharin has been recently synthesized and characterized by ÇakÕr et al [25].…”