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A selective procedure is developed for the determination of glyphosate, aminomethylphosphonic acid, and glufosinate in raw materials of plant origin by chromatography-mass spectrometry. The limit of quantification for glyphosate is 0.1 mg/kg and for glufosinate and aminomethylphosphonic acid, 0.4 mg/kg. The procedure is based on the extraction of analytes from a sample with deionized water acidified with hydrochloric acid, solid-phase purification followed by derivatization with 9-fluorenylmethoxycarbonyl chloride, and the additional purification of the derivatives on a sorbent with weak cation-exchange properties. The extraction and purification procedures for the extracts are optimized. The effect of matrix components on the chromatographic separation and detection of glyphosate on chromatographs-mass spectrometers of various types is studied. Validation of the developed procedure showed that the relative expanded uncertainty lies in the range from 15 to 25%., Author(s): A. V. Sorokin [sup.1] Author Affiliations: (1) grid.494741.b, 0000 0004 6361 2418, The Russian State Center for Animal Feed and Drug Standardization and Quality (VGNKI), , 123022, Moscow, Russia [...]

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.icarus.2009.03.023 Byline: L.N. Fletcher (a), G.S. Orton (a), N.A. Teanby (b), P.G.J. Irwin (b) Keywords: Saturn; Jupiter; Atmospheres; composition; Atmospheres; structure Abstract: The global distribution of phosphine (PH.sub.3) on Jupiter and Saturn is derived using 2.5 cm.sup.-1 spectral resolution Cassini/CIRS observations. We extend the preliminary PH.sub.3 analyses on the gas giants [Irwin, P.G.J., and 6 colleagues, 2004. Icarus 172, 37-49; Fletcher, L.N., and 9 colleagues, 2007a. Icarus 188, 72-88] by (a) incorporating a wider range of Cassini/CIRS datasets and by considering a broader spectral range; (b) direct incorporation of thermal infrared opacities due to tropospheric aerosols and (c) using a common retrieval algorithm and spectroscopic line database to allow direct comparison between these two gas giants. The results suggest striking similarities between the tropospheric dynamics in the 100-1000 mbar regions of the giant planets: both demonstrate enhanced PH.sub.3 at the equator, depletion over neighbouring equatorial belts and mid-latitude belt/zone structures. Saturn's polar PH.sub.3 shows depletion within the hot cyclonic polar vortices. Jovian aerosol distributions are consistent with previous independent studies, and on Saturn we demonstrate that CIRS spectra are most consistent with a haze in the 100-400 mbar range with a mean optical depth of 0.1 at 10 [mu]m. Unlike Jupiter, Saturn's tropospheric haze shows a hemispherical asymmetry, being more opaque in the southern summer hemisphere than in the north. Thermal-IR haze opacity is not enhanced at Saturn's equator as it is on Jupiter. Small-scale perturbations to the mean PH.sub.3 abundance are discussed both in terms of a model of meridional overturning and parameterisation as eddy mixing. The large-scale structure of the PH.sub.3 distributions is likely to be related to changes in the photochemical lifetimes and the shielding due to aerosol opacities. On Saturn, the enhanced summer opacity results in shielding and extended photochemical lifetimes for PH.sub.3, permitting elevated PH.sub.3 levels over Saturn's summer hemisphere. Author Affiliation: (a) Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA (b) Atmospheric, Oceanic & Planetary Physics, Department of Physics, University of Oxford, Clarendon Laboratory, Parks Road, Oxford, OX1 3PU, UK Article History: Received 12 December 2008; Revised 16 March 2009; Accepted 18 March 2009

Phytate is the dominant storage form of phosphorus (P) in mature cereal and oil grains. Phosphorus bound in phytate is nutritionally unavailable to monogastric animals and thus contributes to water pollution because it is excreted in the waste. Also, phytate can chelate certain minerals and exacerbate human mineral deficiencies. Our primary objective was to develop a rapid and inexpensive method of measuring phytate and inorganic P ([P.sub.i]) concentrations in maize (Zea mays L.). The procedure reported herein was derived from previously published assays and used to screen 50 inbred lines to determine its potential in a selection program. Grain yield, protein, oil, methionine, lysine, tryptophan, and kernel weight were also measured. Field repeatability values for phytate and [P.sub.i] (0.78 and 0.91, respectively) suggest that our protocol can be used to make heritable measurements on both traits. Phytate measurements taken with the procedure reported herein matched closely those obtained through ion exchange. The combination of adequate precision and simplicity make this method ideal for breeders interested in improving [P.sub.i] and phytate levels simultaneously. The positive phytate:protein correlation reported commonly was also detected in this study. A relationship between phytate and kernel weight indicates that selection for low phytate may result in larger kernels.

The article discusses biochemical pathways and molecular genetics of reduced bacterial phosphorus (P) metabolism. The presence of microbially mediated phosphorus redox cycle is observed.

Research describes the synthesis of protected 2-amino-4,4-difluoro-3-methyl-4-phosphonobutanoic its isomers accompanied by a new deprotection using S(sub)N2 conditions for the removal of Et groups. Data indicate that this coupled methodology serves as a general methodology for CF(sub)2-substituted phosphoamino acid mimetics-containing peptides.

This article discusses the phosphole structures with respect to their relative stability of the isomers and focuses on 1H-phospholes containing a pyramidal phosphorous atom and a butadienic pi-system. The conformationl stability, pi-electron conjugation, aromaticity, and phosphorous inversion barriers of the phosphole structures are presented.

A study was conducted to examine the electron mobility and carrier concentration measurements in the temperature range of 77-300 K for the undoped In0.5Ga0.5O epitaxial layer. The InGaP alloy's epitaxial layer was grown on the gallium arsenide substrates through liquid phase epitaxy. Results revealed that the electron mobility was limited by ionized scattering of up to 120 K and by alloy, space-charge scattering of up to 300 K.

The series of semirigid phosphonamide macrocyclic ligands with bis(N-phenylamino)phosphine oxide units were synthesized from macrocyclic phosphorus(III) precursors. The synthetic process involves the alkylation of the NH functions of macrocyclic phosphonamides with ethylene or propylene bridges which led to the formation of semirigid phosphorylated macrorings. Furthermore, exo-endo equilibrium of the reaction is dependent on the temperature and polarity of the solvent during conformational change.

Layered gamma-zirconium phosphate can be exfoliated in water-acetone mixtures for the attachement of organic groups to the surface of its exfoliated lamellae via fast topotactic reactions with phosphonic acids. Analysis of the preparation of the organic derivatives of gamma-zirconium phosphate led to the development of a rare layered compound that was transformed into a colloidal dispersion of exfoliated lamellae. Furthermore, the colloidal dispersion of exfoliated lamellae can recomposed after topotactic modifications.

Nuclear magnetic resonance spectroscopy and chemical analysis were utilized to determine the properties of the mechanism that mediate the formation of 2-phenylbenzoxazole from benzoic acid and omicron-aminophenol. The synthetic process for benzoxazole formation was characterized by the reaction of benzoic acid with polyphosphoric acid PPA to form mixed anhydride. The P2O5 content of the PPA modulated the ratio of anhydride to free benzoic acid. Furthermore, the amino group of omicron-aminophenol was protonated in PPA.

The reaction of cyclic aminophosphites with diols or 1,2-diketones led to the formation of aminophosphoranes that exhibited five- and eight-membered rings with cyclohexamino substituents. The pentacoordinated aminophosphoranes were formed via oxidative addition reactions between the cyclic phosphite and the quinone or diol. The -NH proton of the -HNC6H11 grouyp also participated in H-bonding during hydrolysis in the phosphites but not in the pentacoordinated phosphoranes.

The reactivity of the bis(triphenylphosphonio)isophosphindolide triflate was analyzed during the reaction of the bis(phosphonio)isophosphindolide cation with Hg2+. A phosphinito complex was formed by the reaction of the bis(phosphonio)isophosphindolide cation with HgCl2 and H2O or MeOH. The conversion of bis(triphenylphosphonio)isophosphindolide to phosphonium ions also involved 1,1-oxidative additions at the two coordinate phosphorus which was similar to isoelectronic compounds.

X-ray crystallography, infrared and nuclear magnetic resonance spectroscopic analyses were done to characterize the cationic derivatives of (Pd(dmba)(P(OMe)3)(N-triple bond-C-C(H)=PPh3))(ClO4) in which the ylide ligand is N-coordinated to the Pd(super II) center and trans to the ortho-metalated C6H4 group, in an 'end-on nitrile' coordination mode. The reaction of the cationic (Pd(CN)(NCMe)2)+ with Ph3P=C(H)CN in a 1:2 molar ration yielded bis(ylide) complexes in which one ylide is N-coordinated and the other is C-coordinated. When the reaction was done in a 1:1 molar ratio, the products contained the ylide which served as a C,N-bridging system.

The new cage compounds with the general structural formula P2(BNR2)2SnR2' where R2N is tmp and R' is either Ph or Me were synthesized and characterized by mass and infrared spectroscopy. It was found that the dehydrohalogenation of the compounds is enhanced by strong bases and that it proceeds by intra- or intermolecular processes, depending on the molecular size of the R group.

P-germylated diphosphadiboretane crystals were generated by the reaction of iPr2NBP(H)(iPr2NB)PLi.DME and (tmp)BP(H)((tmp)B)PLi.DME with Me2GeCl2 and Ph2GeCl2. The P-germylated diphosphadiboretanes exhibited hindered rotation in the B-N bond region and asymmetric phosphorus units which caused inequivalent CH3 and CH environments in the iPr component. The compounds were also formed via intermolecular HCl elimination pathway that leads to the synthesis of oligomers.

The addition of iodine to tert-butyl(isopropyl)iodophosphane and t-Bu(i-Pr)PI3 led to the formation of t-Bu(i-Pr)PI3.25, t-Bu(i-Pr)PI4 and t-Bu(i-Pr)PI4.33. The reaction process is characterized by cation-anion interactions that are reduced by increasing iodine content. The t-Bu(isopropyl)phosphonium cations exhibited supramolecular chain helical and columnar structures with secondary soft-soft interactions that are dependent on the heavy atom interactions of neighboring substituents.

Simple routes to dichlorophosphines from alpha- and beta-pinene derivatives are proposed. These starting materials can be used in synthetic asymmetric organophosphorus chemistry. Two applications of the compounds were investigated, namely, their reactions with 2,3,3-trimethylbutene and AlCl3 afford either P-chiral phosphetane oxides and P-chiral phosphinic chlorides, in the presence of gaseous HCl, with moderate to high diastereoselectivity.

Novel 1,1-disubstituted alkenes with an (NPCl2)2NPiPr{C[OC(O)Me]=CH2} and [(NPCl2)2NPiPr]2C(OH)Me structure was synthesized by the reaction of MeC(O)Cl with (NPCl2)2NPiPrH. The [(NPCl2)2NPiPr]2C(OH)Me bicyclo-lambda5-phosphazene derivative is composed of two magnetically inequivalent isopropyl groups. The six-membered phosphazene rings of the 1,1-disubstituted alkenes also exhibit small deviations in planarity and weak hydrogen bonds.

A novel oxathiaphospholane method of synthesis of oligo(deoxyribonucleoside phosphorothioate)s in a stereocontrolled manner and with predetermined absolute configuration at each internucleotide phosphorothioate center is presented. The synthesis proceeds with the treatment of 5'-O-(dimethoxytrityl)-2'-O-(tert-butyldimethylsilyl)ribonucleosides with 2-(N,N-diisopropylamino)-1,3,2-oxathiaphospholane and tetrazole, followed by elemental sulfur. This generated 5'-O-DNT-2'-O-(tert-butyldimethylsilyl)-3'-O-(2-thiono-1,3,2-oxathiaphosphol anyl)ribonucleosides.

[TiP(H)=CH2]+ was the primary product structure that was produced from the chemical reaction of Ti+ with CH3PH2 and CH3PD2. The product structure is more stable than the predicted [Ti=PCH3]+ structure. A detailed analysis of the primary reaction product indicated the presence of [Ti=PCH3]+. [Ti=PCH3]+ is an intermediate structure that undergoes a successive H/D exchange with neutral methylphosphine to produce a more stable [TiP(H)=CH2]+.

Crystallographic characterization of tetra ligands of trialkyl trithiophosphite with copper reveals the presence of bidentate coordination in these isostructural copper complexes through phosphorus and sulphur atoms of thiophosphites. Polymeric chains are formed during the coordination. In copper(I) monobromide complexes of triiospropyl trithiophosphite and acetonitrile monodentate, coordination occurs through phosphorus atoms. A reaction between copper(I) and trialkyl trithiophosphite produces 1:1 adducts which on subsequent recrystallization produces desired copper complexes.

The analysis of phosphorus chemical shift tensors by NMR spectroscopy in ruthenium carbonyl compounds shows high deshielding of the phosphorus nucleus compared to some standard reference. The most prominent deshielding occurs for the orientation of the magnetic field along the phosphorus-carbon bond. The chemical shift tensor and its change in orientation are the measure of the structural changes in the compound and the nuclear electronic structure.

Al initio studies on the stability of two tautomeric phosphorus hydrides, H2PPH2 and HPPH3, reveal the higher thermodynamic stability of H2PPH2 than HPPH3, while semiempirical calculations suggests a reverse order of thermodynamic stability. High temperature favor decomposition of H2PP2 rather than its transformation to HPPH3. High barrier for unimolecular tautomerization is responsible for the high stability of an isolated HPPH3 molecule.

Reaction of the sodium phosphinopyrazololate with a dichloromethane solution of (Ni(eta5C5Ph5)Br(CO)) produces a complex that functions as highly active ethene oligomerization catalyst. X-ray diffraction study helps determine the structure of the complex. Presence of a strongly electron withdrawing pyrazole ring connected to a P,O metallacycle leads to significant selectivity toward oligomerization but exerts no influence on the catalytic activity of the Ni complex.

The molten alkali polyselenophosphate flux method helps prepare five isostructural quaternary alkali metal transition metal selenophosphate compounds. Single-crystal X-ray diffraction studies reveal the presence of ethane-like (P2Se6)4- units in these compounds, which have low dimensional extended structures. Optical spectroscopy helps determine the band gaps in these complexes.

Ab initio and extended Huckel methods help analyze the chemical bonding and electronic structure of CdPS3. A second order Jahn-Teller effect accounts for the displacement of Cd atoms along the crystallographic c direction and their reluctance to occupy the center of the octahedral S6 sites. The HOMO's and LUMO's of the P2S(sub 6)(super4-) species in adjacent layers exhibit significant interaction at higher-temperature monoclinic space, while these interactions are absent in the low-temperature rhombohedral phase.

Synthesis of water-soluble (Pd(triphosphine)(CH3CN))(BF4)2 involves the reaction of the triphosphine ligands with (Pd(CH3CN)4)(BF4)2. Substitution of triethylphosphines for the labile acetonitrile ligands generates (Pd(triphosphine)(PEt3))(BF4)2 complexes. Reduction of CO2 to CO is catalyzed by two of the prepared complexes. Quasi-reversible two-electron reductions are observed in the triphenylphosphine complexes, while acetonitrile complexes exhibit irreversible, one-electron reductions.

A new scheme helps synthesize two new platinum(II) dihydride complexes (Pt(Mu-PBu+2)(H)(PBu+2H)2 (1) and (Pt2(Mu-PBut2)Mu-H)(H)(PBut2H)3)CF3SO3 (2). The scheme involves the reaction between CpPt(eta3-C3H5) and PBut2H resulting in complex 1. In the presence of strong acids complex 1, a colorless solid, undergoes protonation at one of the bridging phosphide ligands converting it into a terminal group, while one of the hydrides becomes the bridging ligand. The complex thus produced is 2, which is stable and considered as a precursor for other Pt(II) complexes.

A new scheme enables the preparation of silver halide and silver nitrate complexes of the ligands bis((diphenylphosphino)methyl)benzene (m-pp) and 1,2-bis((diphenylphosphino)methyl)benzene (o-PP). 1H- and 31P-NMR help characterize these complexes. The lengths of the hydro-carbon bridges between the PPh2 groups in the diphosphine ligands influence the structure of the complex. The two metals and the two anions form a rhomboidal core, whose size and shape are influenced by van der Waals interactions of the anions.

X-ray diffraction experiments enable the determination of the crystal structures of MO(PMe3)(CO)5, W(PCl3)(CO)5, Cr(PCl3)(CO)5, Cr(PBr3)(CO)5 and W(PBr3)(CO)5. The pi-acceptor ability of the phosphorus ligand exhibits a correlation with the bond dimensions. Steric and electronic characteristics of the substituents on the phosphorus account for the arrangement of Py3 group with respect to M(CO)4 group. The function of P-Y sigma antibonding orbitals in the pi-accepting characteristics of the P ligand is analyzed by comparing the P-Y bond lengths in the PY3M(CO)5 complexes with those in the uncomplexed PY3 ligand.

Synthesis of monophosphido-bridged compounds and phosphido-hydrido-dibridged complexes involves the reaction of group six metal carbonyls with electron rich terminal phosphido metallocenes. Spectroscopic and EHMO calculations reveal that electron acceptability of M'(CO)4 units in dibridged complexes is higher than that of M'(CO)5 units in monobridged complexes. X-ray analysis enables the determination of W-W distance in a tungsten complex, which suggests a metal-metal interaction.

High-resolution X-ray photoelectron spectroscopy helps analyze the chemical state of sulfur on InP(001) surfaces treated with NH(4)2S(x). The sample exhibits three types of chemical states of sulfur, S2(p3/2) lines at 163.4, 162.0 and 161.2 eV, respectively, at room temperature. The states represent elemental sulfur on sulfide, sulfur bonded to indium on the first layer and sulfur in phosphorus sites, respectively.

Two effects control the metal-assisted pyramidal inversion in metal-phosphido complexes. Planar stabilization through ligand-to-metal pi bonding is the important effect. The other one is inductive destabilization of the pyramidal ground state, which occurs in middle and late transition metal system.

Cyclocondensation between two functionalized species produces phosphorus-containing macrocycles. Condensation reaction produced macrocycles have intracyclic C-P-C, N-P-N, N-N-P-N-N, O-P-O and X-P-Y linkages. Ring opening reactions of five and six-membered rings produce macrocycles with different linkages. Two types of template reactions involving cyclization at a substituent of phosphorus and cyclization at phosphorus produce various macrocycles. Different procedures help the preparation of crystals and polymacrocyclic compounds. X-ray diffraction technique helps the characterization of these macrocycles.

Studies of tetrachlorogallate and tetraphenylborate salts of the phosphenium cations ((iPr2N)2P)+ and (MeNCH2CH2N-(Me)P)+ reveals that the latter is monomeric in the solid state unlike the arsenic analogue. The compound with (Bph4) present is a covalent structure indicating the steric-feature-induced ionic formulation. The stability of the gallate salts in solution reveals the crucial nature of electrostatic interactions or ion-pairing.

An optimized procedure yields large SAPO-5 single crystals with nearly perfect morphology and very good optical quality. NMR spectroscopy reveals that silicon is perfectly integrated on phosphorus sites. Polarized IR radiation microscopy reveals that both OH group types have a perpendicular orientation to the c-axis.

The reaction of nitridoosmium(VI) complexes with tertiary phosphines yields stable nitridoosmiun(VI) phosphine complexes. Without metal reduction, neutral complexes are thermally stable and immune to excess phosphine. Chloride ligands abstract in Os(N)-(CH2SiMe3)2(PMe3)2Cl and Os(N)-(CH2SiMe3)2(dppe)Cl, yielding cationic phosphine complexes.

Au(I) complexes react with the NP3 analog to yield three-coordinate dimers and three-coordinate monomer cations. The NP3 ligand's P atoms are located axially perpendicular to the AuP3 plane at a distance of 2.7 angstroms from the unit, and the nitrogen atom is not involved in the coordination. The Au(I) atom is the center of an equilateral triangle with the coordinated P atoms at the apexes at a distance of 2.36 angstroms. Ag(I) complexes form a single coordination type with NP3. Spectral analysis of the Au(I) complexes reveal that they are luminescent at room temperatures.

TPPTS reacts with aqueous solutions of cobalt carbonyl compounds to yield complexes such as (Co(CO)3-(TPPTS)2)Co(CO4) and Co2(CO)6(TPPTS)2. The complexes exhibit water phase equilibrium under NMR spectroscopy at delta 57.58 and 68.90 parts per million, respectively. X-ray analysis of Co2(CO)6(TPPTS)2 is complex due to the disturbances between solvent, sulfonates and sodium cations. Co2(CO)6(TPPTS)2 undergoes disproportionation under the influence of bases as pH values greater than 10.

The calculations for ligand substitution rate constants for (Ru(H2O)(N-N)(trpy))2+ and the reaction kinetics for the synthesized (Ru(H2O)-(bpy)2(PR3))2+ ligand family yield the cone angles for six bidentate ligands. The phosphine ligand electronic and steric effect calculations for the bpy complexes use the equation f(x) = aE + bS + c, where f(x) is complex reactivity, E is the electronic effect, S is the steric effect and a, b and care linear regression constants. The ligand size is bpy approximately equals phen approximately equals 4,7-Me2phen is less than biq is less than 6,6'-Cl2bpy approximately equals 2,9-Me2phen.

Sequential aggregation of Au(I) complexes around the ((H)nFe3(CO)9P)(super 3-n)- cluster's phosphorus heteroatom yields a series of gold-substituted clusters. NMR spectroscopy of the clusters in the presence of the heteroatom reveals a phosphine ligand for the Au2 and Au3 complexes at room temperatures. The P atom's affinity for Au(1) and the Au(1) fragment interactions control the cluster derivative's structure.

A four-step synthesis from a thiophene precursor yields the ligand, 2,5-bis(2-(diphenylphosphino)-ethyl) thiophene in 44% yield. The thiophene ligand is air stable as a solid and partially air stable in solution. The ligand reveals meridional coordination with MO(0), CO(1) and Rh(1) metals. The ligand is unable to form a strong metal-sulfur bond due to ethylene chain constraints. X-ray crystallography reveals that the ligand in planar and tridentate.

X-ray diffraction methods have been used to establish the crystal structure of (Ru(eta5-C5H4PCy3)(eta5-C5H4OH))PF6. This was done as part of a study of the reactions of tertiary phosphines, phosphites and arsines with (Ru(eta5-C5H5)(eta4-C5H4O))+ derivatives.

The diphenyl(phenylethynyl)phosphine complexes cis-PtX(Y)(Ph2PC triple bond CPh)2, where X = Y = Cl, I, CF3, C6F5, Me; X Y = o-C6H4O2, Me(Cl), were prepared. The dimethyl complex is the only one where intramolecular coupling of the phosphinoacetylene ligands takes place on heating to develop cis-PtX(Y)(o-C16H10(PPh2)2).

The energy-minimized structure of CpRh(CO)(PX3) complexes, where PX3 is CO, trialkylphosphine, trialkyl phosphite, mixed alkyl/arylphosphine or mixed alkyl/aryl phosphite, was elucidated using molecular mechanism techniques. The ligand repulsive energy, ER is calculated using the energy-minimized structure. The Cr(CO)5 metal center is more crowded than the CpRh(CO) metal center in relation to the ligands PX3.

D-isoascorbic acid and L-ascorbic acid were used as starting materials for the development of chiral tetrahydrofuran derivatives in an efficient pathway to enantiomerically pure trans- and cis-4-hydroxy-3-phosphinotetrahydrofurans. Protecting groups are crucial to the synthesis of hydroxy phosphines. Tetrahydrofurans are extremely flexible as building blocks.

The obtaining of 1-phosphaspiro(2.n)alkanes (n = 2-5) has added the phosphinidene complexes, PhPW(CO)5 and MePW(CO)5, to exocyclic olefins. Single-crystal X-ray studies have been used to establish the molecular structures of the parent phosphairane and the parent phosphaspiro pentane obtained from the addition of PhPW(CO)5 to ethylene and methylene cyclopropane, respectively. MePW(CO)5 is less selective and more reactive than PhPW(CO)5 in its additions.

Nucleophilic compounds are produced at silicon compounds due to the extreme sensitivity of phosphinomethylsilane to reagents. The reaction is directly related to the sequential solvolytic disruption of silyl groups from phosphine Ph2PC(SiMe3)3. The rapid tautomerization by proton transfer to carbon alpha is mediated by the silyl groups. The chlorobridged diruthenium precursors act as monodentate phosphines in the ligand formation reactions.

Crystallographs are used to examine the molecular cluster compound Cr1Te8(PEt3)6 (1), which results from the reaction of TePEt3 with (Et3P)2Cr(allyl)2 or Cr(2,4-dimethylpentadienyl)2, to establish its structure. Simple thermolysis can be used to transfrom 1 into the extended inorganic solid state compound Cr3Te4. Cr6 octahedron, Te8 cube and (PEt3)6 octahedron constitute the molecule.