Zn(II), Cd(II) and Hg(II) complexes with 2,2′-Biquinoline, syntheses and X-ray crystal structures of [Hg(bq)(SCN)₂]

Abstract

Reaction of the ligand 2,2 0 -biquinoline (bq) with Zn(ClO 4 ) 2 , CdCl 2 and Hg(SCN) 2 gives complexes [Zn(bq) 2 ] (ClO 4 ) 2 , [Cd(bq) 2 Cl 2 ] and [Hg(bq)(SCN) 2 ] which were characterized by elemental analyses and IR spectroscopy. The crystal structure of [Hg(bq)(SCN) 2 ] was determined by X-ray crystallography. The complex comprises a monomeric Hg(SCN) 2 unit with one 2,2 0 -biquinoline (bq) ligand coordinated to the Hg atom via the two quinolinic nitrogens, giving rise to a five-membered chelate ring in a distorted tetrahedral environment. A -stacking interaction exists between the parallel aromatic rings in adjacent chains, resulting in a planar species in which the mean molecular planes are close to parallel and separated by a distance of $3.5 Å , close to that of the planes in graphite.

(2,2′-Dimethyl-4,4′-bi-1,3-thiazole-κ2N,N′)bis(thiocyanato-κS)mercury(II)

“…For the 2,2 0diamino-4,4 0 -bithiazole adduct, see: Morsali et al (2003). For the 2,2 0 -biquinoline adduct, see: Morsali et al (2004); Ramazani et al (2004). For the 2,2 0 -diphenyl-4,4 0 -bithiazole adduct, see: .…”

Crystal structure of 2,2'-biqinoline-κ2N,N')dichloromercury(II), C18H12Cl2HgN2

“…In this study, we report the structure of a new mercury(II) complex with 2,2'-biquinoline under the formula [HgCl 2 (2,2'-biquinoline)]. Although there is only one report on the coordination of this ligand to Hg (Hg(SCN) 2 (2,2'-biquinoline) [3] [7], have been reported. The asymmetric unit of the title compound contains a half of the title complex.…”

FT-IR and Raman spectroscopic and quantum chemical studies of zinc halide complexes with 2,2′-biquinoline

“…The IR spectroscopic studies on Zn(ClO 4 ) 2 [5], dichlorodioxochromium(VI) [6] and palladium, platinum and rhodium complexes of biq [7] were previously reported. In these studies, however, only some important vibrational modes of the ligand were given.…”