bluuebunny/crossref_metadata_2025_split huggingface dataset:
INTERNAL AND EXTERNAL IMPLICATIONS OF THE STRUCTURE OF HYDROGEN BONDED COMPLEXES . II. MNDO‐PM3 STUDIES ON THE STRUCTURE OF THE 4‐METHYLPYRIDINE COMPLEX WITH PENTACHLOROPHENOL
Authors: Koll A. , Majerz I. 
Published: September 2010

AbstractThe structure of the complex of 4‐methylpyridine with pentachlorophenol in the gas phase was determined by the MNDO‐PM3 procedure and compared with the experimental crystallographic structure. The calculated potential for internal rotation around the hydrogen bond axis predicts a free rotation in the gas phase and a large ability of the complex to adapt its shape to the requirements of the crystal packing. The influence of different internal and external factors on the structure of the studied complex is discussed.
EXITON CHIRALITY METHOD: A TOOL FOR THE CHIRALITY DETERMINATION OF 7,8‐DIDEOXY‐L‐GLYCERO‐D‐MANNO‐OCT‐7‐YNOPYRANOSE
Authors: Elloumi Nabila , Aguiar Leila , Capmau Marie Louise 
Published: September 2010

AbstractA pyranose pathway degradation leads to a 1,2,3‐pentane triol, configuration of which can be confirmed by circular dichroïsm after derivatisation.
SYNTHESIS OF 5‐HYDROXY‐3‐TRIFLUOROMETHYL‐PYRAZOLES BY RING OPENING OF 3‐TRIFLUOROACETYL‐BENZOLACTAMS
Authors: Bouillon J. P. , Janousek Z. , Viehe H. G. , Tinant B. , Declercq J. P. 
Published: September 2010

AbstractNew trifluoromethylated pyrazoles 5b,c,f have been prepared by condensation of 3‐trifluoroacetyl benzolactams 1a,b,c and 2 with hydrazines by opening of the lactam moiety. The structure of pyrazoles was established by X‐ray diffraction analysis and by comparison of 13C‐NMR data. The geometry of intermediate hydrazones 3c‐e and their cyclisations were also investigated.
SOLID‐SOLID INTERACTIONS IN PURE AND Li2O‐DOPED V2O5/AI2O3 SYSTEM
Authors: Abdalla F. H. A. , El‐Shobaky G. A. , Hassan N. A. 
Published: September 2010

AbstractThe effects of calcination temperature (500‐1000°C) and lithium oxide‐doping (4 and 10 mole %) on solid‐solid interactions between AI2O3 and V2O5 were investigated using DTA, TG and their derivatives together with XRD techniques.The results obtained revealed that no solid‐solid interaction between vanadium and aluminium oxides occured at 500°C. These oxides interacted in part, at 650°C to produce AIVO4, the completion of this reaction requires a prolonged heating at this temperature. Li2O‐doping much enhanced the interaction yielding AIVO4, the presence of 4 mole % was found sufficient to stimulate the complete conversion of V2O5 into aluminium vanadate. Aluminium vanadate produced in the case of pure mixed solids decomposed entirely by heating at 750°C giving a well crystallized V2O5 and an amorphous alumina. On the other hand, lithium oxide‐doping much increased the thermal stability of AIVO4 at 750°C and led also to the formation of AIVO3 and LiV10O25 phases.The heating of pure mixed oxides in air at 1000°C resulted in the formation of alpha‐alumina (corrundum) together with V2O5. This treatment, in the case of doped mixed solids, effected the formation of alpha‐Al2O3, V2O5 and LiV10O25 phases. The last compound was formed at 750°C and remained stable by heating at 1000°C. The promotion effect of Li2O in AIVO4 formation was tentatively attributed to dissolution of a small portion of Li2O in V2O5 lattice with subsequent increase in the mobility of V+5 ions.
A SIMPLE AND EFFICIENT METHOD FOR PREPARATION OF ALLYL ARYL ETHERS VIA POLYMER SUPPORTED REAGENTS
Authors: Salunkhe M. M. , Thorat M. T. , Mane R. B. , Sande A. R. , Wadgaonkar P. P. 
Published: September 2010

AbstractAllyl aryl ethers were synthesized in excellent yields and in a state of high purity by reaction of polymer‐supported phenoxide ions with allyl bromide in ethanol at room temperature.
UNEXPECTED DIMERS IN THE SYNTHESIS OF 2‐STYRYLINDOLIZINE
Authors: Nasielski J. , Siberdt F. , De Bue G. 
Published: September 2010

AbstractOn treatment with base, N‐cinnamoylmethyl‐α‐picolinium bromide 3 gives dimers 4 and 5 of 2‐styrylindolizine 1 originating from the Diels‐Alder condensation of the picolinium dienophile 3 with 2‐styrylindolizine or from the self‐condensation of the unsaturated ketone 3. Deuterium labelling allows to prefer the second proposal 2‐β‐Styrylindolizine 1 could be obtained with a 70 % yield by dropping a very dilute solution of salt 3 into a concentrated solution of base.
QUANTUM CHEMICAL CI‐1 ANALYSIS OF UV ABSORPTION SPECTRA OF 1H‐PYRAZOLO[3,4‐b]QUINOLINE SYSTEM
Authors: Pietrzycki Władysław , Danel Andrzej , Tomasik Piotr 
Published: September 2010

AbstractSimulations of UV‐absorption spectra in the region of 200 to 360 nm of 1‐methyl‐3‐phenyl‐, 1‐phenyl‐3‐methyl‐ and 1, 3‐diphenyl‐pyrazolo [3,4‐b]quinolines were carried out. The simulations involved CNDO/S‐CI‐1 calculations of energies, oscillator strengths and eigenvectors of monoexcited singlet states. The UV absorption in the three‐fused ring system of unsubstited 1 H‐pyrazolo[3, 4b]quinoline (PQ) is very similar to the UV absorption of two‐fused six‐membered quinoline or naphtalene systems. The very strong absorption in the region of 242 nm belongs to the 1Bb band, whereas the most longwavelength maximum at 329 nm is qualified as the 1Lb band. On the contrary, the 1,3‐disubstituted PQ derivatives show the UV absorption similar to the acenes with three‐fused six‐membered system and acridine. The 1La band is the most longwavelength located maximum. The overlapped 1Lb band in the UV spectra of three‐fused six‐membered ring compounds appears in the spectra of 1‐phenyl‐3‐methyl‐ and 1,3‐diphenyl‐derivatives.The position of the 1Bb band is the most sensitive to substituent effects from the 1‐position of the system.
Condensation of Ethyl Acetoacetate with Naphthalene‐Diols. The Synthesis of some Novel Coumarins and Chromones. Part 1
Authors: Oyman Ulku , Gunaydin Keriman 
Published: September 2010

AbstractIn Simonis reaction with ethyl acetoacetate naphthalene‐2,6‐diol gives 8‐hydroxy‐3‐methyl‐1H‐naphtho[2,1‐b]‐pyran‐1‐one and naphthalene‐2,7‐diol gives the related 9‐hydroxy isomer. In Pechman reactions, the former diol yields a coumarin, 8‐hydroxy‐1‐methyl‐3H‐naphtho[2,1‐b]‐pyran‐3‐one, with the corresponding orientation, but the latter diol gives a coumarin, 8‐hydroxy‐4‐methyl‐2H‐naphtho[2,3‐b]‐pyran‐2‐one, with an unusual linear annelation pattern.
PREPARATION ET CARACTERISATION DES CYCLOHEXAPHOSPHATES: M2IIM2IP6O18.8H2O AVEC MII: Cu, Zn ET MI: Rb, Tl, K, NH4
Authors: Abid S. , Rzaigui M. 
Published: September 2010

AbstractSix new cyclohexaphosphates with general formula M2IIM2IP6O18.8H2O (MII: Cu2+, Zn2+ and MI: Rb+, Tl+, K+, NH4+) have been prepared. Synthesis and characterization by X‐ray diffraction, IR absorption and DTA are given. All these cyclohexaphosphates crystallize with triclinic unit cells and are isotypic. We give as example the parameters of Cu2Rb2P6O18.8H2O: a = 7.438(3), b = 9.257(3), c = 9.615(3) Å, α = 116.02(2), β = 107.04(2), γ = 83.34(2); Z = 1; PT; V = 569 Å3; Dx = 2.674 g cm−3.
RUTHENIUM CARBONYL CLUSTERS AS CATALYSTS IN THE WATER GAS SHIFT REACTIONS
Authors: Moya Sergio , Sariego Renato , Aguirre Pedro , Sartori Rebeca , Dixneuf Pierre 
Published: September 2010

AbstractThe catalytic activity of Ru3(CO)9 L3 (L = arylphosphine) in the WGSR and in the reduction of nitro derivatives to amines is studied. The same complex is supported in polystyrene‐divinylbenzene copolymer (PSDVB) and the catalytic activity of this heterogeneous material on the fore mentioned reactions is herein studied. In the same way, Ru3(CO)12 is reacted with PSDVB, previously functionalized with 1,2‐ethylenediamine, giving an active catalyst for these reactions.
SYNTHESIS, CHARACTERIZATION AND IODODEMETALLATION REACTIONS OF 3‐(TRIPHENYLSTANNYL)‐1,2‐PROPANEDIOL
Authors: Kayser François , Biesemans Monique , Delmotte Ann , Willem Rudolph , Gielen Marcel 
Published: September 2010

AbstractThe syntheses of 3‐(triphenylstannyl)‐, 3‐(iododiphenylstannyl)‐ and 3‐(diiodophenylstannyl)‐1,2‐propanediol are reported. These compounds were characterized by 1H, 13C and 119Sn NMR, Mössbauer and mass spectroscopy. Their in vitro antitumour activities are likewise reported.
GAS PHASE HYDROGENATION/HYDROGENOLYSIS OF ISOPHTHALDEHYDE OVER NI/SIO2
Authors: Keane Mark A. 
Published: September 2010

AbstractThe gas phase hydrogen treatment of methanolic solutions of isophthaldehyde (IPA), in the temperature range 393 K ≤ T ≤ 653 K, was studied over a Ni/SiO2 catalyst prepared by homogeneous precipitation/deposition. The products, identified as 3‐methylbenzyl alcohol, m‐xylene, toluene and benzene resulted from the hydrogenation and/or the hydrogenolysis of the substituent C = O bonds and from the hydrogenolysis of the aryl‐carbonyl C‐C bonds; the aromatic ring remained intact. The temperature dependence of the rate constant and product selectivity are illustrated. It is concluded that both carbonyl substituents interact with the catalyst and that all the products are generated via a concerted hydrogen attack on both carbonyl groups; the overall reaction pathway is identified. The reaction of benzaldehyde and 3‐methylbenzyl alcohol over the same catalyst was also investigated for comparative purposes.
REACTIONS ENE AVEC LA P‐CHLORO(BISTERIMETHYLSILYL)METHYLENE PHOSPHINE
Authors: Abbari M. , Ueno Y. , Sinbandhit S. , Carrié R. 
Published: September 2010

AbstractP‐Chloro (bistrimethylsilyl) methylene phosphine gives ene reactions with simple alkenes and with α‐ethylenic hydrazones. Aza Diels Alder reactions are not observed with latter compounds but are possible when the azadiene bears electro‐donor substituants.
STUDIES ON THE PRENYLFLAVONOIDS PART XV. SYNTHESIS OF (±)‐SPINOFLAVANONE B
Authors: Zhao Lianyun , Bu Xianyong , Li Yulin 
Published: September 2010

AbstractSpinoflavanone B was prepared for the first time by the condensation of 2‐hydroxy‐4, 6‐dimethoxy‐methoxy‐3,5‐diprenylacetophenone with benzaldehyde followed by cyclization and demethoxymethylation.
COMPLEXES OF SOME METAL IONS WITH A SCHIFF BASE LIGAND DERIVED FROM ISATIN AND O‐AMINOPHENOL
Authors: Hassaan Aly M. , Khalifa Mohamed A. , Shehata Aziza K. 
Published: September 2010

AbstractA series of new metal chelates of Ni(II), Co(II), Cu(II), Fe(III), Zn(II), Cd(II) and La(III) with a Schiff base ligand formed by condensation of isatin with o‐aminophenol have been synthesized and characterized via elemental analyses, infrared, electronic spectral data, proton nuclear magnetic resonance spectra, conductivity and magnetic measurements. Two types of complexes were isolated. The [M(IAP)2]nH2O complexes in which two molecules of the ligand are coordinated to the central metal Ion as bis‐uninegative ONO tridentate forming electrolytic and non‐electrolytic octahedral complexes. On the other hand, the dimeric [M(IAP)CIH2O]2 complexes attain the octahedral structure owing to the bridging nature of the ligand.
STUDIES ON SYNTHESIS , CHARACTERIZATION AND ANTITUMOR ACTIVITY OF TERNARY COMLPEXES OF PYRUVIC ACID ISONICOTINOYL HYDRAZONE AND 5‐FLUOROURACIL‐1‐ACETIC ACID WITH RARE EARTHS
Authors: Zhengyin Yang , Rudong Yang , Liufang Wang , Xinping Yang 
Published: September 2010

AbstractThirteen ternary complexes of pyruvic acid isonicotinoyl hydrazone(H2PPFH) and 5‐fluorouracil‐1‐ acetic (HFAA) with rare earths have been synthesized in the paper. The structure and properties of the ternary complexes were determined by elemental analyses, infrared and ultraviolet spectra, molar conductivity and1H NMR. A general formula of the complexes is RE(PPFH)(FAA)2H2O (RE(III) = La–Yb). Antitumor activity of La(PPFH) (FAA) 2H2O was tested with Leukaemia cells L1210and transplanted mouse tumor colon cancer C27. The results show that the inhibitory rate for C27is 41.2%.
LES ENZYMES EN SYNTHESE ORGANIQUE IX: ACYLATION ENZYMATIQUE DE AMINES SECONDAIRES CYCLIQUES
Authors: Djeghaba Zeineddine , Deleuze HervÉ , Maillard Bernard , De Jéso Bernard 
Published: September 2010

AbstractEnzymatic acylation of cyclic secondary amines was performed in organic solvant. Best results were obtained with Horse Liver Acetonic Powder (HLAP). Acyclic secondary amines were not substrate for several lipases or esterases.
SELECTIVITY IN HDS, HDN, HDO AND HYDROCRACKING CONTRIBUTION OF REMOTE CONTROL AND OTHER NEW CONCEPTS
Authors: Delmon Bernard 
Published: September 2010

AbstractThis paper reviews some recent results in the field of hydrotreatment by sulfide catalysts. It comes in complement to a former review on the subject (1), by focusing more on new insights into the structure of the conventional CoMo (or NiMo) catalysts and the way they catalyze the various reactions involved. A first part constitutes an attempt to make an inventory of the types of catalytic sites: hydrogenation sites, sites active for the hydrogenolysis of carbon‐heteroatom bonds, acidic sites either on the sulfide phase (probably ‐SH groups) or situated on the support. A second part discusses the influence of the morphology of the MoS2crystallites, in particular the possibility that different catalytic functions be located on the rims and on the lateral edges. The variation in selectivity of the hydrotreatment catalysts as a function of the reaction conditions and their relative stability when the catalysts ages point to factors which are Independent of initial morphology. The role of spillover hydrogen will be illustrated by new examples of our laboratory concerning hydrodenitrogenation, on the one hand, and the dramatic increase of acidity of silica alumina (by a factor of more than 10) under the influence of spillover hydrogen emitted by a sulfided CoMo/Sio2catalyst, on the other hand. In the latter experiment, the hydrocracking of diphenyl methane served as a test reaction and the role of spillover was substantiated by H‐D exchange experiments. In a last part, some prospects offered by the new advances will be outlined with a special emphasis on the controlled Interconversion of sites due to remote control by spillover hydrogen. The new concepts can very likely be extended to many areas of hydrotreatment.
CoMo/Al2O3 VERSUS NiMo/Al2O3 SULPHIDE CATALYSTS : SENSITIVITY TO REACTION CONDITIONS FOR HDS AND HYDROGENATION
Authors: van Gestel J. , Finot L. , Leglise J. , Duchet J. C. 
Published: September 2010

AbstractTwo industrial hydrotreating catalysts, CoMo/Al2O3 and NiMo/Al2O3, were compared with respect to their activity and selectivity In thiophene hydrodesulphurisation and cyclohexene hydrogenation at 280°C and 4 MPa. Their difference in catalytic properties for HDS and hydrogenation was found strongly dependent on the experimental conditions. Addition of small amounts of H2S to the feed inhibits the activity of both catalysts; but at high H2S levels, the catalysts remain active. A new type of site is proposed to operate at high H2S levels. The NiMo catalyst was found far more active than the CoMo catalyst at low H2S pressure, while the two catalysts became equivalent at high H2S levels.
THE INFLUENCE OF WATER ON THE SULFIDATION OF CoNaY STUDIED BY MÖSSBAUER EMISSION SPECTROSCOPY, EXTENDED X‐RAY ABSORPTION FINE STRUCTURE AND THIOPHENE HDS ACTIVITY
Authors: De Bont P. W. , Vissenberg M. J. , Boellaard E. , van Santen R. A. , De Beer V. H. J. , Van Kraan A. M. Der 
Published: September 2010

AbstractThe influence of physisorbed water on the sulfidation of an ion exchanged CoNaY catalyst is studied by MÖSSBAUER EMISSION SPECTROSCOPY , EXTENDED X‐RAY FINE STRUCTURE AND THIOPHENE HDS ACTIVITY Hydrodesulfurization activity measurements. Physisorbed water present during sulfidation affects the Co‐sulfide dispersion and the initial HDS activity. Its removal prior to sulfidation clearly results in an improvement of these two catalyst parameters.
EFFECT OF THE H2S AND H2PARTIAL PRESSURE ON THE HYDRODENITROGENATION (HDN) OF ANILINE AND INDOLE OVER A NiMoP‐γAL2O3CATALYST
Authors: Callant Marc , Holder Keith A. , Grange Paul , Delmon Bernard 
Published: September 2010

AbstractWe studied the effect of the H2S and the H2partial pressures on the competitive HDN of aniline and indole over a NiMoP‐γAl2O3catalyst. The reactions were carried out with a continuous‐flow reactor at 5 MPa and 573 K. Our results confirm that H2S has a promoting effect on the C‐N bond cleavage and a detrimental effect on hydrogenation but, in contrast to what is reported in the literature, we found that the global effect of H2S on nitrogen removal is negative. We explained this difference by the fact that, in our experiments, HDN is controlled by the hydrogenation function of the catalysts. H2has an effect opposite to H2S and the parameter that can be considered is the ratio H2S/H2.
Computer Modelling of a Molybdenum Disulfide Catalyst: Density Functional Calculations on Molybdenum‐Sulfur Clusters
Authors: Mitchell P. C. H. , Plant C. 
Published: September 2010

AbstractPreliminary calculations using the Density Functional Theory (DFT) method on saturated and unsaturated molybdenum‐sulfur clusters which model the active site of a molybdenum disulfide catalyst are reported. Creating an edge vacancy at molybdenum by removing sulfur atoms causes the energy of the HOMO to increase; the catalyst is a better electron donor. At the same time the charge density on basal sulfurs increases enhancing the ability of the basal plane to Interact with α‐orbitals of the thiophene molecule. Changes in the HOMO energies and the charge densities depend on the structure of the catalyst, In particular on the separation between unsaturated Mo atoms at the active site.
Comparative Study of Sulfide Ni‐Mo Catalysts, Supported on y‐al2o3 and Activated Carbon by Using Radioisotope 35s
Authors: Kogan Victor M. , Dung Nguen Thi , Yakerson Vladimir I. 
Published: September 2010

AbstractUsing radioactive Isotope 35S a comparative study of C‐ and Al2O3‐supported MoS2 catalysts promoted by Nl in hydrodesulfurization of thiophene has been performed. Ni content varied from O up to 3.5%. Promotion effect on thiophene conversion and catalyst sulfide sulfur mobility has been studied. C‐supported catalysts have been found to have higher catalytic activity than analogous alumina‐supported ones. Active site productivity in both C‐ and Al2O3‐supported catalysts is the same but the number of active sites in the former is larger than in the latter.
TPR and FTIR Study of Nitrided Molybdena‐Alumina Catalyst
Authors: Nagal M. , Kusagaya T. , Miyata A. , Oml S. 
Published: September 2010

AbstractNitrided 11.7% and 97.1% molybdena‐alumina catalysts have been Investigated using temperature‐programmed reaction with hydrogen (TPR) and diffuse reflectance FTIR connected to a mass spectrometer with the aid of XRD analysis. From the TPR and XRD analyses, y‐Mo2N was formed on the surface of the 11.7% and 97.1% Mo/Al2O3 nitrided at 700°C. On the basis of the NH3‐TPD and IR spectroscopies, much more Lewis acid sites than Brønsted acid sites are present on the surface of the nitrided molybdena‐alumina.
Structural Stability of Binary Sulfide Catalysts During the Hydrotreating of Coal‐Derived Liquids
Authors: Shimada Hiromichi , Matsubayashi Nobuyuki , Imamura Motoyasu , Sato Toshio , Yoshimura Yuji , Kameoka Takashi , Masuda Koji , Nishijima Akio 
Published: September 2010

AbstractThe structures of the supported binary sulfide catalysts, such as Ni‐Mo/Al2O3 or Ni‐W/Al2O3 catalysts, used in hydrotreating were analyzed by the X‐ray absorption fine structure method. The catalytically active phase of the “Ni‐Mo(W)‐S” structure was found to decompose into bulk single sulfides, particularly when the feedstock contained large amounts of nitrogen‐ or oxygen‐containing compounds. The active phase was able to be recovered by careful calcination of the segregated catalyst followed by sulfiding.
LOW TEMPERATURE SYNTHESIS OF METAL NANOMETER SCALE PARTICLES IN TRIETHYLAMINE MEDIUM
Authors: Kondakov Sergei E. , Smirnov Vladimir V. , Olenin Andrei YU. 
Published: September 2010

AbstractThe process of metal cluster formation has been studied in conditions of metal vapor synthesis with tertiary amines. The samples have been investigated by IR, UV‐VIS, ESR and photon correlation spectroscopy. For the first time the nature of matrix complexes of the free metal and triethylamine have been discussed in terms of donor‐acceptor properties. It has been shown that the using of triethylamine as cryomatrix leads to the formation of stable ultrafine (Mg, Mn, Cu, Na, Sm, Pb) metal particles. Key words: metal clusters, metal vapor synthesis, cryochemical synthesis, size of particles, triethylamine.
STUDIES IN THE AZOLE SERIES. CIV.1 EXPERIMETAL AND CALCULATED DIPOLE MOMENTS OF 3(5)‐PHENYLPYPRAZOLES
Authors: Cativiela Carlos , García JosÉ Ignacio , Fayet Jean‐Pierre , Elguero JosÉ 
Published: September 2010

AbstractThe experimental dipole moments of four pyrazoles, namely 3(5)‐phenyl‐5(3)‐methylpyrazole 4, 1,5‐di‐methyl‐3‐phenylpyrazole 10, 1,3‐dimethyl‐5‐phenylpyrazole 11 and 1‐methyl‐3,5‐diphenylpyrazole 12, were combined with literature data on other pyrazoles (only H, CH3 and C6H5 substituents) to discuss the structure and tautomerism (NH derivatives) of these compounds. Ab initio theoretical calculations, up to 6‐31G**/3‐21G level were carried out to get a deeper insight on their structure, particularly on the conformation of the phenyl groups. The main conclusion is that a phenyl group near the “imine” nitrogen enhances the dipole moment of pyrazoles.
BENTONITE K10 CLAY, AN EFFICIENT CATALYST FOR THE FORMATION OF NITROGEN DERIVATIVES
Authors: Eynde Jean Jacques Vanden , Mayence Annie , Lor Pascal , van Haverbeke Yves 
Published: September 2010

AbstractBentonite K10 clay has been used to catalyze the formation of enamino carbonyl derivatives, 2‐methyl‐1H‐benzimidazoles, Hantzsch 1,4‐dihydropyridines, Hantzsch pyridines, 2‐substituted 1,3‐diphenylimidazolidines, and tetrahydropyranylbenzazoles.
DETERMINATION OF TOTAL CR IN STEEL BY MEASUREMENT OF A VIOLET CR(VI) COMPLEX BY FIA‐SPECTROPHOTOMETRY
Authors: Sun Junying , Chen Xingguo , Hu Zhide 
Published: September 2010

AbstractA new simple, rapid and sensitive spectrophotometric flow injection analysis (FIA) method is developed for the determination of chromium(VI) based on its reaction with 3,5‐Br2‐PADAP and SCN°‐ in a strongly acidic medium. This produces an unstable violet product with a maximum absorption at 605 nm. As the product formed is unstable, FIA is an ideal method to reproducibly monitor the transient signal. The calibration curve is linear over 1.0 × 10–6 to 7.0 × 10–5 mol l–1. The correlation coefficient of the calibration curve is 0.9998, the detection limit is 5.0 × 10–7Cr2O72‐ mol l–1 and sample throughput is 80 h–1. The method has been successfully applied to the determination of chromium in steel.
SYNTHESE ET CARACTERISATION DE TROIS NOUVEAUX CYCLOHEXAPHOSPHATES: LI3M3P6O18.H2O. M: Rb, TI et NH4
Authors: Elmokhtar Ould Sidi Mohamed , Rzaigui Mohamed 
Published: September 2010

AbstractChemical preparation and characterization by X‐ray diffraction and IR absorption are reported for three new cyclohexaphosphates: Li3M3P6O18.H2O with M = Rb, TI, NH4. These compounds are isotypic. Their hexagonal unit cell parameters are a = 15.165(4), c = 13.100(4) Å for Rb salt, a = 15.182(4), c = 13.100(4) Å for TI salt and a = 15.077(3), c = 12.855(2) Å for NH4 salt. Space group R3, Z = 6.