Untitled

Mixed ligand palladium(II) and platinum(II) complexes of tertiary diphosphines and benz-1,3-imidazoline-2-thione, benz-1,3-oxazoline-2-thione or benz-1,3-thiazoline-2-thione

“…Thioamide band (I) is due to m(C=N) mainly and partially d(NH) + d(CH) was shifted to higher frequency on complex formation [24,25]. Thioamide band (II) which is due to m(C=S) mainly and partially m(C=N) was shifted to a lower frequency on coordination through the sulfur atom only and split into two bands, one with a lower frequency, the other with a higher frequency when ligand coordinated from both S-and N-atoms [1]. Thioamide band (III) which is mainly due to m(C-S) and partially to m(C-S) + m(C-N) was only reduced in intensity on complex formation [1].…”

“…Thioamide band (II) which is due to m(C=S) mainly and partially m(C=N) was shifted to a lower frequency on coordination through the sulfur atom only and split into two bands, one with a lower frequency, the other with a higher frequency when ligand coordinated from both S-and N-atoms [1]. Thioamide band (III) which is mainly due to m(C-S) and partially to m(C-S) + m(C-N) was only reduced in intensity on complex formation [1]. Thioamide band (IV) which is mainly due to m(C-S) was unaffected when ligands are coordinated as bidentates and shifted to a higher frequency on coordination as monodentates [24].…”

“…We have been studying the coordination modes of the heterocyclic thiones ambidentade ligands, 5-phenyl-1,3,4-oxadiozole-2-thione [1], 4,5-diphenyl-1,2,4-triazole-3-thione [2], (LH) with palladium(II) or platinum(II) in the presence of either tertiary monophosphine (A) or diphosphine ligands (B) {B = Ph 2 P(CH 2 ) n PPh 2 ; n = 1-4}. We found that the reaction of the chelated complexes trans-[ML 2 ] (M = Pd or Pt) with the tertiary monophosphines or tertiary diphosphines gave complexes of the type [ML 2 A 2 ] or [ML 2 B] in which the deprotonated heterocyclic thione ligands L behave as monodentate binding to metals either through sulphur or the heterocyclic nitrogen atoms.…”

“…resonance with relatively high J(Pt-P), 3162 Hz to the N-coordination bzimt isomer, while the relatively high chemical shift resonance at 48.3 p.p.m. with the lower coupling constant J(Pt-P) = 2,353 Hz was assigned to the S-coordinated bzimt isomer[1]. The 31 P-{ 1 H}-n.m.r.…”

“…with associated platinum satellites J(Pt-P) = 2,323 Hz which suggests the presence of a single isomer. On the basis of the J(Pt-P) value we assigned this isomer to the S-coordinated bzoxt isomer[1]. The 31 P-{ 1 H}-n.m.r.…”