2 edition of New transition metal complexes containing phosphine and sulphur ligands. found in the catalog.
New transition metal complexes containing phosphine and sulphur ligands.
Ian Michael Hawkins
Thesis (Ph.D), University of East Anglia, School of Chemical Sciences, 1988.
Full text unavailable from EThOS. Please contact the current institution’s library for further details. 1 H- and 13 C-NMR Spectra. Table 2 shows the 13 C-NMR and 1 H-NMR spectral data for compounds 1 and 13 C-NMR spectra of compounds 1 and 2 showed the presence of deshielded –HN–C(=S)S at and ppm. The positions of these chemical shifts proved that 1 and 2 predominates as the thione tautomer in DMSO-d 6 solution. The –CH 2, which is located in between .
So much sulfur: The reactivity of the binary and ternary sulfur halides S 2 Cl 2, SCl 2, SF 4, SF 6, and SF 5 Cl towards transition‐metal compounds is described. Reaction pathways include sulfurization, chlorination, chlorofluorination, or fluorination at metal centers, but also the generation of ligands containing sulfur halide moieties. Phosphine ligands are also π-acceptors. Their π-acidity arises from overlap of P-C σ* anti-bonding orbitals with filled metal orbitals. Aryl- and fluorophosphines are stronger π-acceptors than alkylphosphines. Trifluorophosphine (PF 3) is a strong π-acid with bonding properties akin to those of the carbonyl ligand. In early work, phosphine ligands were thought to utilize 3d orbitals to.
Silylphosphines can be described as bi- or polydentate ligands bearing at least one basic phosphorous (III) atom, usually a phosphine PR 3 or phosphite P(OR) 3, and at least one silicon-substituted P (III) group is able to form a coordination bond to the transition metal, while the silyl moiety is potentially prone to bind by means of loss of H 2, alkane or arene molecules. We were interested to extend our library of P,N-ligands, and to investigate the influence of a five-memebered ring-chelate, since most of the previously tested ligands form six-membered ring-chelates. In consequence, twelve new phosphinomethyl-oxazolines and their corresponding iridium-complexes were prepared and tested in the enantioselective hydrogenation of unfunctionalized and.
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New transition metal complexes with ligands containing several sulfur donor atoms were obtained by addition of CO to the corresponding non-carbonyl-containing iron–ligand complex (eqn ). The structure of these ligands forced trans-coordination of the thiolate groups.
Transition Metal Complexes with Sulfur Ligands. 1 Synthesis, Structure, and Reactivity of the Sulfur-Rich Ruthenium Hydride Complexes [Ru(H)(PR 3)(‘S 4 ')]-and the η 2-H 2 Complex [Ru(H 2)(PCy 3)(‘S 4 ')] (R = Ph, i Pr, Cy; ‘S 4 ' 2-= 1,2-Bis((2-mercaptophenyl)thio)ethane(2−)) Dieter Sellmann; Torsten Gottschalk-Gaudig; Frank W.
HeinemannCited by: A selection of ruthenium and osmium nitrosyl halide complexes, MX 3 (NO)(AR 3) 2 [M = Ru, Os; X = Cl, Br; A = P, R = alkyl, aryl, or mixed alkyl aryl; A = As, R = phenyl] have been prepared by a convenient single-stage synthesis involving addition of ruthenium or osmium halides and N-methyl-N-nitrosotoluene-p-sulphonamide or pentyl nitrite to a solution of the appropriate tertiary phosphine or.
Sulfur ligands form a broad family of complexes with these metals, and therefore they have been widely investigated in this context. Beside these second and third series transition metal complexes, some nickel species, which contain sulfur ligands, have also been shown to catalyze this reaction.
Thiolato and thioether ligandsCited by: (c) Phosphine complexes. Tertiary phosphines, PX 3, are very useful as stabilization ligands in transition metal complexes and they coordinate to the metals in relatively high to low oxidation states.
Phosphines are frequently used as carbonyl or cyclopentadienyl ligands in the chemistry of organometallic complexes. Modification of transition-metal complexes by complexation with Lewisbase ligands, especially phosphines or phosphites, has led to major improvements in catalytic reactivity and selectivity.(1,2.
General Information. Phosphine ligands have the general formula PR 3 where R = alkyl, aryl, H, halide etc. Closely related are phosphite ligands which have the general formula P(OR) phosphines and phosphites are neutral two electron donors that bind to transition metals. Transition Metal Complexes Containing Phosphine Ligands.
Levason, C. McAuliffe. Pages Transition Metal Complexes Containing Monotertiary Arsines and Stibines. Cloyd Jr, C. McAuliffe. Pages The Chemistry of Multidentate Ligands Containing Heavy Group VB Donors.
Chiswell. Pages Abstract. Sincewhen Hofmann reported 1 the first phosphine† complexes (those formed between triethylphosphine and platinum and gold), the chemistry of the coordination complexes of transition metal ions and phosphines has been increasingly investigated; there are few fields of chemistry in which research activity increases at such a pace.
The palladium and platinum complexes, M(PPh 3) 4, react with sulphur dioxide under anaerobic conditions to afford dark purple air-sensitive derivatives, M(SO 2)(PPh 3) 3; these products undergo aerobic oxidation to form sulphatocomplexes, M(SO 4)(PPh 3) 2,H 2 O.
The rhodium and iridium hydrides, M′H (CO)(PPh 3) 3, on treatment with sulphur dioxide yield the first sulphur. This chapter consists of Subchapters 11–18 and covers useful reagents and ligands. Discussed are homoleptic transition metal acetonitrile cations with tetrafluoroborate or trifluoromethane sulfonate anions; syntheses of [M II (NCMe) 6] 2+ salts of tetrakis[3,5‐bis(trifluoromethyl)phenyl]borate; transition metal p‐toluenesulfonates; polynuclear iron complexes; tetraethyl ammonium.
A systematic quantum chemical study of the bonding in d 6 ‐transition‐metal complexes, containing phosphine‐stabilized, main‐group‐element fragments, (R 3 P) 2 E, as ligands (E=AlH, BH, CH +, C), is using energy decomposition analysis, it is demonstrated that a strong M−E bond is accompanied by weak P−E bonds, and vice versa.
Cyano metal complexes contain one or more bound cyanide ligands, CN⁻, and constitute one of the largest and longest-known classes of compounds in inorganic chemistry.
A pioneering example for such NHCs is N‐phosphine oxide‐substituted imidazolylidenes (PoxIms), and their synthesis and strategic use are highlighted. The utility of PoxIms by far exceeds the conventional use as multidentate ligands for metal complexes on account of the synergetic functions of the carbene and the N‐phosphine oxide group(s).
Inorg. Chem. All Publications/Website. OR SEARCH CITATIONS. Tertiary phosphines also stabilize an exceptionally wide variety of metal Phosphine Ligands • complexes of interest to the organometallic chemist as their phosphine frequencies of a series of complexes of the type LNi(CO)3, containing different Wiley-Interscience:New York, L.
Hegedus, ‘Transition Metals in the Synthesis of. The field of transition metal catalysis has experienced incredible growth during the past decade. The reasons for this are obvious when one considers the world's energy problems and the need for new and less energy demanding syntheses of important chemicals.
Heterogeneous catalysis has played a. Transition metal phosphine cluster Phosphine ligands binds well to most transition metals, especially those in the middle and late transition metals of groups In terms of steric bulk, PPh 3 has a cone angle of °, which is intermediate between those of P(C 6 H 11) 3 (°) and P(CH 3) 3 (°).
In an early. Copper-Sulfur Complexes Supported by N-Donor Ligands: Thus, while phosphine ligands allow for the synthesis and isolation of The μ 4-S 2 2− coordination in 11 and 12 has been seen previously in transition metal complexes, but to our knowledge it is new for copper.
metal complexes of transition element with heterocyclic ligands, especially those containing nitrogen and sulphur have diverse applications in various fields including biology and antiherbicidal activities of thioamide ligands and its metal complexes are well known and get more attraction recently.
Sulphur and nitrogen donor ligands are. Numerous review articles pertaining to phosphrne transition metal complexes have appeared in the literature over the past twenty years.
Early reviews by McAuliffe detailed the chemistry of bidentate and tetradentate phosphines including some mixed donor ligands.^ Meek published^O a less extensive review of phosphine transition metal.Coordination Complexes.
Coordination compounds, such as the FeCl 4-ion and CrCl 3 6 NH 3, are called such because they contain ions or molecules linked, or coordinated, to a transition are also known as complex ions or coordination complexes because they are Lewis acid-base complexes.
The ions or molecules that bind to transition-metal ions to form these complexes are called ligands.New sulfur-phosphine ligands derived from sugars: synthesis and usually achieved by using a transition metal bound to a chiral organic ligand, responsible for the enantiodiscrimination.
Surprisingly, an analysis of the massive literature on metal catalyzed program directed toward the use of sulfur based ligands derived from.