Showing papers by "Peter G. Jones published in 1988"
TL;DR: In this paper, the structure of groupe d'espace PI P2 1 /n is affinee with R=0,069 and R= 0,065.
66 citations
TL;DR: The arylsilver derivatives AgR (R = C6F5, 2,4,6-C6F3H2 or C6Cl5) react with chlorogold precursors to give the corresponding aryl gold complexes in good yield as mentioned in this paper.
48 citations
TL;DR: The use of rigid, idealized hexagons in X-ray refinement can give misleading values for the MC bond length as discussed by the authors, and the distortions are larger in metal-C6F5 complexes, where the relevant CCCC angle can be as low as 109°.
35 citations
TL;DR: In this article, the reaction between [Au(2-C6H4-CH2NMe2)Cl2] and [HgPh2] gives [Aou(2C 6H4CH2NsMe2)(Ph)Cl] with ClO4− and the relevant ligand L. The molecules differ somewhat in the orientation of the rings.
30 citations
TL;DR: In this paper, the structures of two forms of [Ag(C6F5)(CH2PPh3] have been established, which differ mainly in the orientation of one phenyl ring.
Abstract: Monomeric silver ylide complexes [Ag(C6F5)(CH2ER3)](ER3= PPh3, PPh2Me, PPhMe2, or AsPh3) can be prepared by the reaction of Ag(CF3CO2) with Li(C6F5) and [ER3Me][CF3CO2]. The free ylides CH2PPh3, CH2PPh2Me, or CH(CO2Me)PPh3 react with Ag(C6F5) or AgClO4 to afford [Ag(C6F5)(ylide)] or [Ag(CH2PPh3)2]ClO4 respectively. Several novel ylide-transfer reactions from silver ylides to other silver or gold centres are reported. The structures of two forms of [Ag(C6F5)(CH2PPh3)] have been established. The molecules differ mainly in the orientation of one phenyl ring. The C6F5 groups are highly distorted at the ipso carbon [C–C–C 113.1 (5) and 112.5(5)°].
24 citations
TL;DR: Arbuzov et al. as mentioned in this paper compose η 5 -CpCoI 2 (PPh 2 NHCH(Me)Ph) reagit avec le trimethyl phosphite ou le dimethyl phenyl phosphonite pour donner les produits d'Arbuezov.
18 citations
TL;DR: In this article, the coordination lineaire pour An.Cl(C 2 H 6 S) cristallise dans P2 1 /c avec a=6031, b=14,825 et c=6,417 A, β=95,67 o, Z=4; affinement jusqu'a R=0,028.
Abstract: [AuCl(C 2 H 6 S)] cristallise dans P2 1 /c avec a=6,031, b=14,825 et c=6,417 A, β=95,67 o , Z=4; affinement jusqu'a R=0,028. Coordination lineaire pour An. Les molecules sont liees en chaines par contacts Au....Au cours de 3,226 A, avec un angle Au...Au...Au de 168,1 o
15 citations
TL;DR: In this article, the Hippurato-complex has been determined to have an Au-O bond and the reaction between Ph3PAuCl and silver salts of N-substituted glycines leads to complexes Ph 3PAuX, where X is the substituted glycinate.
Abstract: The reaction between Ph3PAuCl and silver salts of N-substituted glycines leads to complexes Ph3PAuX, where X is the substituted glycinate; the X-ray structure determination of the hippurato-complex confirms the presence of an Au–O bond.
15 citations
TL;DR: Au(C 6 H 5 ) 3 P(CN) cristallise dans P2 1 2 1 2 2 1 avec a=10,388, b=12,420 et c=13,057 A, Z=4; affinement jusqu'a R=0,037 as mentioned in this paper.
Abstract: [Au(C 6 H 5 ) 3 P(CN)] cristallise dans P2 1 2 1 2 1 avec a=10,388, b=12,420 et c=13,057 A, Z=4; affinement jusqu'a R=0,037. Determination de la structure absolue avec un affinement n. Geometrie de coordination lineaire pour Au
13 citations
TL;DR: A new lycoctonine-type C-19 diterpenoid alkaloid, pubescenine (3), bearing a C-6α oxygen function, was isolated from Consolida pubescens (DC.) Soo, and its structure determined by 1 H and 13 C NMR analyses, and X-ray crystallography as discussed by the authors.
12 citations
TL;DR: The ruthenium cluster [PPN][HRu3(CO)9(PhNCO)]{[PPN]=(Ph3P)2N} has been synthesised by intramolecular nucleophilic attack on CO and characterised by X-ray structure determination as mentioned in this paper.
Abstract: The ruthenium cluster [PPN][HRu3(CO)9(PhNCO)]{[PPN]=(Ph3P)2N} has been synthesised by intramolecular nucleophilic attack on CO and characterised by X-ray structure determination.
TL;DR: In this article, 2,4,6-tri-butylphenylphosphane reacts with CpFe(C5H4AsCl2) in the presence of DBU to yield a three-membered ring containing arsenic, phosphorus and platinum.
Abstract: 2,4,6-Tri-butylphenylphosphane reacts with CpFe(C5H4AsCl2) in the presence of DBU to yield CpFe[C5H4As=PC6H2(t-Bu)3]. The reaction of this arsaphosphene with (Ph3P)2PtC2H4 yields , a three-membered ring containing arsenic, phosphorus and platinum.
TL;DR: The reaction between Ag+ and HCN in liquid sulphur dioxide leads to the linear silver(I) complex [Ag(NCH)2]+, isolated as its [SbF6]− salt as discussed by the authors.
Abstract: The reaction between Ag+ and HCN in liquid sulphur dioxide leads to the linear silver(I) complex [Ag(NCH)2]+, isolated as its [SbF6]– salt.
TL;DR: In this paper, the structure of homobinuclear complexes has been solved by X-ray crystallography, and the neutral derivatives can be used to form homobased methanide complexes.
Abstract: The complexes [Au(C6F5)2Cl(SPh2PCH2PPh2CH2R)]ClO4(R = H or Ph) react with Na2CO3 or NaH to give four-membered methanide auracycles [[graphic omitted]HPPh2CH2R)]ClO4 or [[graphic omitted]PPh2CH2R)], respectively; these complexes can be interconverted by reaction with with NaH or HClO4. The neutral derivatives can be used to form homobinuclear complexes [[graphic omitted]C(AuX)PPh2Me}](X = C6F5 or Cl) and [[graphic omitted](AuPPh3)PPh2Me}]BF4 and react with water to give [Au(C6F5)2(SPPh2O)(CH2PPh2CH2R)]. The structure of [Au(C6F5)2(SPPh2O)(CH2PPh2Me)] has been solved by X-ray crystallography.
TL;DR: Cristallisation dans P2 1 /n avec affinement jusqu'a 0,077 as discussed by the authors, a.k.a. structure plan carre.
Abstract: Cristallisation dans P2 1 /n avec affinement jusqu'a 0,077. Les anions ont une structure plan carre. Chaque atome de sodium est relie a 7 atomes de chlore
TL;DR: The reactions of Ag[AsF6] or Ag[SbF6], with ClCN, BrCN, and ICN yield the complexes [Ag(NCCl)2][AsF 6], [AgNCCl]2][SbC 6], Ag(NCBr)2] and [AgNCl] as discussed by the authors.
Abstract: The reactions of Ag[AsF6] or Ag[SbF6] with ClCN, BrCN, and ICN yield the complexes [Ag(NCCl)2][AsF6], [Ag(NCCl)2][SbF6], [Ag(NCBr)2][AsF6], [Ag(NCBr)2][SbF6], and [Ag(NCl)2][AsF6] The salt [Ag(NCCl)2][SbF6] was characterized by an X-ray single-crystal structure investigation The cation is monomeric The cyanogen halide is bonded to the silver through nitrogen, with Ag–N 2140(4)A The co-ordination geometry at silver is exactly linear
TL;DR: AuCI{P(C6H5)(C10HgFe)2} was obtained as a brown powder from the reaction of carbonylgold(I) chloride with diferrocenyl(phenyl)phosphine in benzene, and recrystallized from dichloromethane/petrol ether as orange to red plates as discussed by the authors.
Abstract: AuCI{P(C6H5)(C10HgFe)2}), M r= 710.5, monoclinic, P21/n, a = 10.205 (2), b = 18.014 (4), c=12.680(3)A, fl=98.29(2) ° , V=2306.5A 3, Z --- 4, Dx= 2.04 Mg m -3, 2(Mo Ka) = 0.71069/~, # = 7.8 mm -1, F(000) = 1368, T= 293 K. The structure was refined to R 0.035 for 3523 unique observed reflections. The coordination geometry at the Au atom is linear, with Au-C1 2.289 (2), Au-P 2.234 (2)/~, C1-Au-P 176.1 (1)% There are no unusually short intermolecular contacts. The Fe-C distances lie in the range 2.025 (8)-2.058 (8)/~, mean 2.041 (8)./k. The C5H 4 rings of the ferrocene moieties are approximately ecliosed (rotated by 12, 14 °, respectively). Experimental. The title compound was obtained as a brown powder from the reaction of carbonylgold(I) chloride with diferrocenyl(phenyl)phosphine in benzene, and recrystallized from dichloromethane/petrol ether as orange to red plates. A full elemental analysis con- firmed the expected composition. A crystal 0.55 x 0.35 x 0.15 mm was mounted in a glass capillary. 5761 profile-fitted intensities (Clegg, 1981) were registered on a Stoe-Siemens four-circle diffractometer using monochromated Mo Ka radiation (20ma x 50 °, quadrant -h+k+l and some +h equiv- alents). An absorption correction based on ~, scans was applied, with transmission factors 0.34 to 0.99. The intensities of 3 check reflections showed no significant variation. Merging equivalents gave 4045 unique reflections (Rin t 0"026, index ranges h-12 to + 12, k 0 to 21, 10 to 15), 3530 with F > 4a(F). Cell constants were refined from 20 values of 40 reflections in the range 20-23 o. The structure was solved by the heavy-atom method and subjected to full-matrix least-squares refinement on F. All non-H atoms were refined anisotropically; H atoms were included using a riding model. The final R value was 0.0352, wR 0.0412 for 280 parameters, 3523 reflections (seven low-angle reflections were omitted because of extinction effects). The weighting scheme was w-i= tr2(F)+ 0.0004F 2. Max. shift/e.s.d. = 0.003, max. residual electron density within +1.0 e A -3 near Au, S = 1.52. The program system was SHELX (Sheldrick, 1986), locally modified by its
TL;DR: Cristallisation dans C 2/C avec affinement jusqu'a 0,051 as mentioned in this paper is composed of deux types of couches: les trois atomes de plomb independants sont coordinnes aux ions chlorures and acetates en formant des couches qui sont reliees par les ions AuCl 4 −
Abstract: Cristallisation dans C 2/C avec affinement jusqu'a 0,051. La structure est constituee de deux types de couches: les trois atomes de plomb independants sont coordinnes aux ions chlorures et acetates en formant des couches qui sont reliees par les ions AuCl 4 −
TL;DR: In this article, the crystal structure of Pb{Au(OCOCH₃)₄}₂·2H₆O shows that it is isostructural to the strontium salt, consisting of molecular units with crystallographic symmetry 2.
Abstract: Various salts M(AuX₄)₂ with X = OCOCH₃ or OCOC₂H₅ have been prepared by two methods: (i) the reaction of metal hydroxides M(OH)₂ with HAuCl₄, followed by treatment of the intermediate products with acetic or propionic acid, or (ii) the reaction of aurates M{Au(OH)₄}₂ with the carboxylic acids. The crystal structure of Pb{Au(OCOCH₃)₄}₂·2H₂O shows that it is isostructural to the strontium salt, consisting of molecular units Pb{Au(OCOCH₃)₄}₂ with crystallographic symmetry 2. The water of crystallization forms neither coordinate bonds to a metal nor hydrogen bonds. In the analogous zinc salt the water is coordinated to the zinc atom, and the structure is a layer polymer. The two compounds that crystallize in anhydrous form. Ba{Au(OCOCH₃)₄}₂ and Pb{Au(OCOC₂H₅)₄}₂, have not yet yielded crystals suitable for X-ray analysis.
TL;DR: In this paper, the atome de zinc a coordination octaedrique (avec quatre atomes d'oxygene des groupements propionate and deux molecules d'eau) is presented.
Abstract: Cristallisation dans I4 avec affinement jusqu'a 0,030. Structure polymerique bidimensionnelle=l'atome de zinc a une coordination octaedrique (avec quatre atomes d'oxygene des groupements propionate et deux molecules d'eau); l'atome d'or est coordine a quatre atomes d'oxygene des groupements propionate dans une structure plan carre
TL;DR: In this article, it is proposed that coproferrihaem compound I undergoes a rate-determining reaction with water, probably involving nucleophilic attack at the porphyrin meso positions, to form species which are susceptible to rapid oxidative attack by other Compound I molecules.
Abstract: Coprohaem Compound I, formed by oxidation of coproferrihaem {[3,8,13,17-tetramethylporphyrin-2,7,12,18-tetrapropionato(6–)-N21,N22,N23,N24]ferrate(3–)} with peroxyacids in reactions of 1 : 1 stoicheiometry, decomposes in aqueous solution in the absence of added reductants. The reaction is biphasic and follows series first-order kinetics. The formation of a coprohaem Compound II intermediate has been implicated. When the initial ratio of [peroxyacid] : [coproferrihaem] was ⩽ 1, an approximately constant proportion (75–80%) of the Compound I initially formed was reduced back to coproferrihaem and the remainder was converted into products which were non-absorbing in the Soret and visible spectral regions. It is proposed that coproferrihaem Compound I undergoes a rate-determining reaction with water, probably involving nucleophilic attack at the porphyrin meso positions, to form species which are susceptible to rapid oxidative attack by other Compound I molecules and resulting in the reduction of 3–4 molecules of Compound I for each molecule of Compound I oxidatively destroyed.
TL;DR: Cristallisation dans P2 1 /n avec affinement jusqu'a 0,034 as discussed by the authors, where Zn is a structure octaedrique deformee; Au a structure plan carre.
Abstract: Cristallisation dans P2 1 /n avec affinement jusqu'a 0,034. Zn a une structure octaedrique deformee; Au a une structure plan carre. Les molecules d'eau ont une structure cis. Deux atomes de chlore de chaque groupement AuCl 4 − sont pontes sur Zn
TL;DR: Coproferrihaem (cfh) reacts very rapidly with peroxybenzoic acids at pH = 6.0 in aqueous solution, in processes of 1 : 1 stoicheiometry, to form a spectroscopically distinct oxidised derivative coprohaem Compound I (ch-I), which is stable on the stopped-flow time-scale.
Abstract: Coproferrihaem (cfh) reacts very rapidly with peroxybenzoic acids at pH = 6.0 in aqueous solution, in processes of 1 : 1 stoicheiometry, to form a spectroscopically distinct oxidised derivative coprohaem Compound I (ch-I), which is stable on the stopped-flow time-scale. The rate constants for ch-I formation are comparable to those for the formation of horse radish peroxidase Compound I with peroxybenzoic acids. The Soret band absorption spectrum of ch-I is independent of initial [cfh] and [peroxyacid] with R, the ratio [peroxyacid] : [cfh], in the range 1 99% monomer under the conditions employed, the absorption spectra at R < I suggest limited dimer formation between ch-I and unoxidised cfh. Coprohaem Compound I exhibits powerful peroxidatic oxidant properties. In particular ch-I is reduced by methanol, ethanol, and propargyl alcohol (prop-2-yn-1-ol) with rate constants that parallel in sequence those with catalase Compound I, although the enzymatic intermediate reactions are 102–104 times faster than those with ch-I.
TL;DR: In this article, it is proposed that coproferrihaem compound I undergoes a rate-determining reaction with water, probably involving nucleophilic attack at the porphyrin meso positions, to form species which are susceptible to rapid oxidative attack by other Compound I molecules.
Abstract: Coprohaem Compound I, formed by oxidation of coproferrihaem {[3,8,13,17-tetramethylporphyrin-2,7,12,18-tetrapropionato(6–)-N21,N22,N23,N24]ferrate(3–)} with peroxyacids in reactions of 1 : 1 stoicheiometry, decomposes in aqueous solution in the absence of added reductants. The reaction is biphasic and follows series first-order kinetics. The formation of a coprohaem Compound II intermediate has been implicated. When the initial ratio of [peroxyacid] : [coproferrihaem] was ⩽ 1, an approximately constant proportion (75–80%) of the Compound I initially formed was reduced back to coproferrihaem and the remainder was converted into products which were non-absorbing in the Soret and visible spectral regions. It is proposed that coproferrihaem Compound I undergoes a rate-determining reaction with water, probably involving nucleophilic attack at the porphyrin meso positions, to form species which are susceptible to rapid oxidative attack by other Compound I molecules and resulting in the reduction of 3–4 molecules of Compound I for each molecule of Compound I oxidatively destroyed.