Platinum Group Metal Complexes Research Articles

Synthesis and characterization of novel platinum group metal complexes of bis[2-(diphenylphosphino)ethyl]amine

A mixed donor tridentate ligand bis[2-(diphenylphosphino)ethyl]amine (DPEA) was synthesized in its hydrochloride form by a modified procedure and characterized by 1H, 13C and 31P NMR spectral data. Reaction of RhCl(CO)(PPh 3) 2 with DPEA · HCl and NaBPh 4 in methanol gave the cationic Rh(I) complex [Rh(DPEA)PPh 3IBPh 4 but the reaction of IrCl(CO)(PPh 3) 2 with DPEA · HCl in boiling benzene gave a unique complex, [Ir(H)(Cl)(CO)(DPEA)]Cl, in which five different donor atoms are coordinated to the single Ir(III) ion. A neutral, RH(III) complex of the composition [RhCl 3(DPEA)] was prepared by the reaction of RhCl 3 · xH 2O with DPEA · HCl in methanol. Reaction of PdCl 2(COD) with DPEA · HCl in benzene or methanol gave the cationic complex [PdCl(DPEA)]Cl the above reaction conducted in benzene-acetone-methanol mixture gave the 1:2 complex [Pd(DPEA) 2]Cl 2. A novel trinuclear Pt(II) complex of the composition [Pt 3Cl 3(DPEA) 3]Cl 3 was prepared by the reaction of K 2PtCl 4 and DPEA · HCl in water-acetone mixture. Reaction of K 2PtCl 4, DPEA · HCl and NH 4PF 6 in water ethanol mixture gave the binuclear, cationic complex, [Pt 2(DPEA) 3](PF 6) 4. All the complexes were characterized by elemental analysis, conductivity, 1H and 31P NMR spectral data.

Tin(II) chloride in the analytical chemistry of the platinum metals: From the “purple of cassius” to polyurethane foams

Tin(II) chloride has played a central role in the non-instrumental analytical chemistry of the platinum group metals, the characteristic reaction between tin(II) chloride and platinum(II/IV) chloride having been documented for more than 180 years. The intense colour of hydrochloric acid solutions containing small amounts of Pt(II/IV) and tin(II) chloride constituted one of the first trace colorimetric methods for the determination of Pt in the sub parts per million range. Similar spectrophotometric methods of trace analysis for Rh have been known for more than half a century. Remarkably the detailed nature of the interaction of tin(II) chloride with the platinum group metals has only been elucidated relatively recently, and there is evidence of recent renewed interest in platinum group metal complexes involving the SnCl 3 − moiety as ligand. We wish here to give a brief history of the use of tin(II) chloride in the analytical chemistry of the platinum group metals, highlighted by some of our recent work involving the selective immobilization of chloro(trichlorostannato)platinum/rhodium complex anions by polyurethane foams as a means of separation and pre-concentration of small amounts of Rh and Pt.

Platinum group metal complexes with 6-mercaptopurine and its riboside

Complexes of 6-mercaptopurine (6-MP) and its riboside (6-MPR) with RhCl 3·3H 2O, RuCl 3·H 2O, and IrCl 3·6H 2O were isolated from methanolic solutions. The complexes exhibit 1:1 and 1:2 metal-to-ligand composition. The compounds were characterized by chemical analysis, conductivity and magnetic measurements, infrared, electronic reflectance, and 1H NMR spectroscopy. Spectroscopic evidence suggested that the metal ion coordinates to 6-mercaptopurine riboside through the S 6 and N 7 while to 6-mercaptopurine through the S 6.

Syntheses and spectroscopic studies of some platinum group metal complexes with oxazepam as ligand

The preparation and characterization of some rhodium(III), iridium(III), palladium(II) and platinum(II) halide complexes with oxazepam, 7-chloro-1,3-dihydro-5-phenyl-3-hydroxy-2H-1,4-benzodiazepin-2-one are reported. The obtained complexes of the type ML 3X 3 (M = Rh, Ir) and ML 2X 2 (M = Pd, Pt) with the exception of the rhodium and palladium iododerivatives which have 1:6 and 1:4 metal:ligand ratios, respectively, have been studied and characterized through vibrational and electronic spectra, 1H and 13C NMR studies, conductivity measurements and magnetic susceptibility data. The wavelengths of the principal electronic absorption peaks have been accounted for quantitatively in terms of the crystal field theory and the various parameters have been calculated. The most convincing structural evidence supports an octahedral stereochemistry for the rhodium and iridium derivatives and a square planar geometry for the palladium and platinum compounds with terminal halides and terminal ligands, acting as monodentate only in all the metal complexes through the nitrogen atom in the 4-position.

Dibenzo[a,e]cyclooctatetraene in a proposed test for heterogeneity in catalysts formed from soluble platinum-group metal complexes

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDibenzo[a,e]cyclooctatetraene in a proposed test for heterogeneity in catalysts formed from soluble platinum-group metal complexesDouglas R. Anton and Robert H. CrabtreeCite this: Organometallics 1983, 2, 7, 855–859Publication Date (Print):July 1, 1983Publication History Published online1 May 2002Published inissue 1 July 1983https://doi.org/10.1021/om50001a013RIGHTS & PERMISSIONSArticle Views1828Altmetric-Citations335LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (618 KB) Get e-Alerts Get e-Alerts

Reversed-phase ion-pair partition chromatography of bromo-anion complexes of platinum group metals (rhodium(III), palladium(II), and platinum(IV)).

A novel method for the separation of bromo-anion complexes of platinum group metals ( Rh, Pd and Pt ) by reversed-phase ion-pair partition chromatography has been developed. The excellent separation of RhBr52- PdBr42-and PtBr62-was accomplished on a Fine SIL C18 ( ODS ) packed column, where acetonitrile - phosphate buffer ( pH 7 ) mixture containing tetrabutylammonium bromide and sodium bromide was used as a mobile phase. These anion complexes can be detected at 310 nm, and the amount of PtBr62- as low as 1 × 10-11mol can be determined with the peak height method which gave a straight calibration curve. In this paper, the effects of ion-pair reagents, acetonitrile-water ratio, pH, temperature and light on the chromatogram are reported.

Syntheses and properties of platinum group metal complexes with 1,4-benzodiazepines as ligands

Following our interest in the chemistry of 1,4-benzodiazepines [1–4], we report the results of the study of the derivatives of rhodium(III), iridium(III), palladium(II) and platinum(II) halides with Oxazepam, 7-chloro-1,3-dihydro-5-phenyl-3-hydroxy-2H-1,4-benzodiazepin-2-one [5]: ▪ The study of the stereochemistries and of the chemical reactivity of coordination compounds of benzodiazepines will help to determine what relationship exists between chemical structure and biological activity of these drugs, in the belief that metal complexes of ligands having biological activity are more active than the free ligands. The obtained complexes, of the type ML 3X 3 (M = Rh, Ir; X = Cl, Br, I) and ML 2X 2 (M = Pd, Pt; X = Cl,Br, I), have been studied and characterized through vibrational and electronic spectra, 1H and 13C n.m.r. studies, conductivity measurements and magnetic susceptibility data. Furthermore, the complexation effects of the transition metal ions on the conformation of the diazepine ring are discussed. The results will be discussed in detail and compared with those obtained for other metal complexes with the same ligand and for a long series of benzodiazepines in the free and complexed form.

Studies on the Complexes of Platinum Group Metals with Nicotinamide and Brucine

Studies on the Complexes of Platinum Group Metals with Nicotinamide and Brucine

Platinum group metal complexes with adenine and cytosine

Methanolische Losungen der Liganden und der Metallchloride bzw. des Komplexes RuCl, (DMSO)4 liefern beim Mischen im Verhaltnis 1:3 die Komplexe (I)-(V), die IR-spektroskopisch untersucht wurden.

Nitrosyl Complexes of the Platinum Metals

In recent years much research has been carried out on platinum group metal complexes, especially those containing the carbonyl ligand. As the nitrosyl group is a nitrogen bonded ligand which in its normal mode of bonding is isoelectronic with carbon monoxide, the chemistry of complexes containing co-ordinated nitric oxide is interesting, and they may have similar potential uses to the carbonyl complexes. This article outlines our present knowledge of the nitrosyl complexes and their mode of bonding.