Complexes of substituted benzothiazoles 4. Nickel(II) complexes of the bidentate benzothiazoles 1,2-bis(2-benzothiazolyl)benzene and 1,2-bis(2-benzothiazolyl)ethane

Abstract

Can. J. Chem. 68,514 (1982).The nickel coordination chemi5try of two potentially bidentate his-benzothiazole ligands is compared. 1.2-Bis(2-benzothiazoly1)-benzene (OBT), which has an o-phenylene bridge, forms square planar derivatives with Nix, (X = I, CIO,, BF,), octahedral derivatives with Nix, (X = NCS, NO,), and five-coordinate derivatives with Nix2 (X = CI, Br). 1,2-Bis(2-benzothiazoly1)ethane (BBTE), which has an ethylene bridge, forms tetrahedral derivatives with Nix, (X = C1, Br, I) and an octahedral complex with Ni(N03),. Although both ligands are capable of tetrahedral coordination about a cobalt centre, the apparent preference of tetrahedral coordination with nickel complexes of BBTE seems unusual. The only difference between the two ligands lies in the bridging group between the benzothiazole rings. Stiuctural assignments are supported by ligand field and infrared spectra, magnetic data, and an X-ray structure of the complex [Ni(BBTE)Br,], which has been shown to have a distorted tetrahedral stereochemistry.LAURENCE KENNETH THOMPSON, JOHN CHARLES THOMAS RENDELL et GEORGE CHARLES WELLON. Can. J. Chem. 60,514 (1982).On compare la chimie de coordination du nickel de deux ligands bis-benzothiazoles, potentiellement bidentates. Le bis(benzo-2 thiazoly1)-1,2 benzene (OBT), qui a un pont o-phenylene, forme des derives plan carres avec Nix, (X = I, CIO,, BF,), des derives octaedriques avec Nix, (X = NCS, NO,) et des derives pentacoordonnes avec Nix, (X = C1, Br). Le bis(benzo-2 thiazoly1)-1,2 ethane (BBTE), qui a un pont ethylene, forme des derives tetraedriques avec Nix, (C = C1, Br, I) et un complexe octaedrique avec Ni(NO,),. En depit du fait que les deux ligands peuvent avoir une coordination tetraetrique autour du centre cobalt, la preference apparente pour une coordination tetraedrique avec les complexes de nickel du BBTE semble inhabituelle. La seule difference entre les deux ligands reside dans le groupe qui fait le pont entre les cycles benzothiazoles. Les determinations de structure s'appuient sur le champ de ligand et ies spectres infrarouges, les donnees magnetiques et la structure, determinee par diffraction de rayons X, du complexe [Ni(BBTE)Br,] qui ont revele la stereochimie tetraedrique deformee de ce complexe.[Traduit par le journal]

Synthesis and spectral studies on Co (II), Ni(II) and Cu(II) complexes with 1,2- bis(N-methylbenzimidazolyl)benzene

“…5 The far-IR spectra of the chloro complexes displayed peaks due to terminal  M-Cl and  M-N (M = Co, Ni or Cu) around 315 and 278 cm -1 respectively. 14 The room temperature magnetic moments of the complexes indicate the paramagnetic nature of the metal ions except for [Ni(L) 2 ](ClO 4 ) 2 .H 2 O which behaved as diamagnetic. 5 The magnetic moments of the halo complexes of Co(II) are in the range 4.0 -4.7 BM.…”

Spectral studies of transition metal complexes of dihydrobis(1-pyrazoyl)borate with some Lewis bases

“…The bands appearing at 468 (benzene), 462 (CH 3 Cl) and 575 nm (DMF) were due to d-d transitions. The d-d bands in the 480-460 nm region, which were assigned to 1 A 2g ← 1 A 1g , are characteristic of a Ni(II) ion in a square planar environment, [3] and the band at 575 nm, which was assigned to 3 T 1 (F) ← 3 A 2g , is characteristic of a Ni(II) ion in an octahedral environment [3,28,29]. These results indicate the coordination of two molecules of DMF to the Ni 2+ ion in Ni(H 2 BPz) 2 .…”

Ti (IV) Complexes of Some Heterocyclic Ligands Synthesis, Characterization and Ethylene Polymerization Activity

“…A review of the literature revealed that 1,2-bis(2-benzothiazolyl)benzene and 1,2-bis(2-benzothiazolyl)ethane are frequently used as ligands and a considerable number of their complexes with late transition metals are reported [1][2][3][4][5][6] . Also, the nickel(II), cobalt(II) and copper(II) coordination chemistry of some tetradentate ligands involving benzothiazole functional groups has been published 7 .…”