Complexes of palladium, platinum and rhodium with 2,2?-biquinoline and 2-(2?-pyridyl)quinoline

Experimental and quantum‐chemical studies of 1H, 13C and 15N NMR coordination shifts in Pd(II) and Pt(II) chloride complexes with quinoline, isoquinoline, and 2,2′‐biquinoline

“…Such an approach had already led to a good agreement with experimental data. 32,44,45 The LanL2DZ 13 and Zaghal et al 14 ). The instability of all studied coordination compounds in DMSO-d 6 is probably the result of substitution of azine ligands by the molecules of the solvent (dimethyl sulfoxide being well known to have its own ligating ability), which suggests a relatively high lability of Pd-N and Pt-N coordination bonds.…”

“…Single crystal X-ray data have also been reported for several coordination compounds with auxiliary groups other than chlorides: trans-[Pt quin-N NH 3 Cl 2 ] L. Pazderski et al (LODBUB) and trans-[Pt isoquin-N NH 3 2 1,3-bis(diphenylphos phino)propane)] 2C cations, in the above-mentioned trifluoromethylsulfonate salts. 7 To the best of our knowledge, no reports involved 15 N NMR of any Pd(II) or Pt(II) coordination compounds with quin, isoquin, or bquin (some 14 N data were published for trans-[Pd(quin) 2 N 3 2 ] but they concerned only azide and not the quin ligand 6 ). In the present paper, we report 1 H, 13 coordination shifts ( coord D υ complex υ ligand ) in relation to the type of the platinide metal (Pd, Pt), coordination sphere geometry (trans-/cis-), and the position of a nitrogen atom within the azine ring system (N(1) in quin, bquin; N(2) in isoquin).…”

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

“…4). These modes were observed at 343 and 304 cm À1 , and 302 and 225 cm À1 , at Raman spectra of nicotinamide complexes of ZnCl 2 and ZnBr 2 , respectively [23], and 345 and 330 cm À1 , and 300 and 295 cm À1 at the IR spectra of Pd(biq)Cl 2 and Pd(biq)Br 2 complexes, respectively [7]. Zn-N stretching vibrations of the complexes were calculated at 190 and 157 cm À1 for Zn(biq)Cl 2 (DFT/B3LYP 6-31G(d,p)) and 182 and 157 cm À1 for Zn(biq)Br 2 (see Table 2).…”

“…In solid state, 2,2 0 -biquinoline molecule is known to be in trans coplanar configuration [21], however cis form occurs on formation of complexes with metal ions [6,7,11,12]. When no symmetry restrictions were imposed during the geometry optimizations, the minima located at molecular potential energy surface corresponded to C 1 symmetry for both complexes.…”

“…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.…”