bluuebunny/crossref_metadata_2025_split huggingface dataset:
Electrochemical Study of Tricarbonyl(η6-cyclooctatetraene)metal(0) Complexes of the Group 6 Elements
Authors: Yilmaz Giirkan Atinç , Önal Ahmet M. , Özkar Saim 
Published: February 2015

Abstract
Tricarbonyl(η6-cyclooctatetraene)metal(0) complexes of the group 6 elements were prepared by using the procedures described in the literature with some minor modifications and identi­fied by IR and NMR spectroscopy. Their electrochemical behavior was studied by using cyclic voltammetry in dichloromethane solution containing 0.1 M tetrabutylammonium tetrafiuorob-orate as supporting electrolyte. Their oxidation and reduction potentials were measured and discussed in terms of the frontier energy levels in connection with the UV-Visible electronic ab­ sorption spectral data. In order to elucidate the mechanism of electrooxidation of the complexes, constant potential electrolysis was performed for one representative example, tricarbonyl(η6-cyclooctatetraene)chromium(O). The IR monitoring of the reaction showed that it is gradually converted to hexacarbonylchromium(O) upon electrolysis at constant potential.
Über die Reaktion von Bis(t-butylamino)dimethylsilan mit Titantetrachlorid. Kristallstrukturen des Imido-Komplexes [TiCl2(N-CMe3)(H2 N-CMe3)(CH3CN)]2 und des Ketimido-Komplexes [TiCl3 {NC(Me)N(H)CMe3}(CH3CN)2]/ On the Reaction of Bis(t-butylamino)dimethylsilane with Titanium Tetrachloride. Crystal Structures of the Imido Complex [TiCl2(N-CMe3)(H2N-CMe3)(CH3CN)]2 and of the Ketimido Complex [TiCl3{NC(Me)N(H)CMe3}(CH3CN)2]
Authors: Mommertz Andreas , Leo Roland , Massa Werner , Dehnicke Kurt 
Published: February 2015

Abstract
The reaction of bis(t-butylamino)dimethylsilane with titanium tetrachloride in dichloromethane solution leads to a mixture of compounds from which the imido complex (H3NCMe3)2[TiCl3(N-CMe3)]2 (1) and by extraction of the residue with acetonitrile the imido complex [TiCl2(N-CMe3)(H2N-CMe3)(CH3CN)]2 (2) can be isolated. 1 reacts with acetonitrile to give the ketimido complex [TiCl3{NC(Me)N(H)CMe3}(CH3CN)2] (3). According to crystal structure determinations 2 consists of centrosymmetric dimeric molecules containing TiCl2Ti bridges, the N-CMe3
2- ligands being in equatorial positions with TiN bond lengths of 168.8(4) pm which corresponds to double bonds. In the monomeric complex 3 the chloro ligands are in meridional positions of the distorted octahedrally coordinated titanium atom with a TiN bond length of 175.7(2) pm of the ketimido ligand.
Metal Ion-Binding Properties in Aqueous Solution of the Nucleoside Analogue, 5,6-Dichloro-1-(β-ᴅ-ribofuranosyl)benzimidazole (DRB)
Authors: Kapinos Larisa E. , Song Bin , Sigel Helmut 
Published: February 2015

Abstract
The stability constants of the 1:1 complexes formed between Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+ or Cd2+ (= M2+) and 5,6-dichloro-l-(β-ᴅ-ribofuranosyl)benzim idazole (DRB) were determined by potentiom etric pH titrations in aqueous solution (25 °C; I = 0.5м, NaNO3). The acidity constant of H(DRB)+, the proton being at N3, was measured by the same method and the result was confirmed via spectrophotometry. Based on previously established [L. E. Kapinos, B. Song, H. Sigel, Inorg. Chim . Acta 280, in press (1998)] logм
мʟ versus Kʜ
ʜʟ straight-line plots for complexes of imidazole-type ligands it is shown for the Mn(DRB)2+ and Zn (DRB)2+ complexes, as examples, that the benzene ring of the benzim idazole residue exerts a steric inhibition for metal ion binding at N3; i.e., the data points for the M(DRB)2+ complexes fall clearly below the straight lines defined by the imidazole- type ligands.
Solvothermal Synthesis and Crystal Structure Determination of Tris- (ethyleneamine-ammonium) Tetraselenoantimonat: Non-Centrosymmetry Mediated by an Extended Unusual N-H···N Hydrogen Bonded Network?
Authors: Wendland Frank , Näther Christian , Schur Michael , Bensch Wolfgang 
Published: February 2015

Abstract
The title compound has been synthesized under solvothermal conditions by the reaction of elemental chromium, antimony and selenium in a solution of 40% 1,2-ethanediamine (en) in methanol. The crystal structure consists of tetrahedral SbSe4
3- anions which are connected by monoprotonated 1,2-ethanediamine (enH+) cations via N-H--Se hydrogen bonding. The enH+ cations are joined via strong N-H -N hydrogen bonds between the ammonium hydrogen and the amino nitrogen atom forming four distinct chains, each built up of three crystallographically independent enH+ cations. Two of these chains are running parallel to [100], the other two are parallel to [010]. Based on this arrangement different centrosymmetric or non-centrosymmetric hydrogen bonding patterns are possible, but only in one chain the sequence of NH2 and NH3
+ groups was determined by X-ray diffraction
Zur Existenz von [ReNCl4-nFn]- (n = 1-3) Nitridorhenat(VI)-Gemischt- ligandkomplexen -Eine EPR-Untersuchung / EPR Evidence of [ReNCl4-n FnJ– (n = 1-3) Nitridorhenate(VI) Mixed-Ligand Complexes
Authors: Voigt Andreas , Abram Ulrich , Kirmse Reinhard 
Published: February 2015

Abstract
The formation of mixed-ligand complexes of the type [ReVlNCl4-nFn]- (n = 1 -3) during the reaction of [ReVINCl4]- with [n-(C4H9)4N]F, KF, and HF is reported. Evidence of the individual mixed-ligand compounds is given by their EPR spectral data. In frozen solutions a specific dependence of the EPR data on the composition of the coordination sphere could be detected. This is shown (i) by a nearly linear dependence of gII and AII Re on the Cl/F-content of the [ReVINCl4-nFn]- unit (additivity rules) and (ii) by well-resolved 19F hyperfine splittings.
Synthesis and Crystal Structure of N-[(15,4R)-2-Oxo-pinanyl]-β-alanine Methylester
Authors: Albert Barbara , Jansen Martin , Jakobi Jörg , Steckhan Eberhard 
Published: February 2015

Abstract
The title compound, N-[(lS,4R)-2-oxo-pinanyl]-β-alanine methylester, is an important starting material for the electrochemical preparation of chiral amidoalkylation reagents in the synthesis of chiral β-substituted β-amino acid derivatives. The investigation of its crystal structure reveals an arrangement of the carbonyl group and the amine function, which is influenced by a hydrogen bonding interaction. This conformation makes the molecule especially appropriate for further synthetical modification
Synthesis of Pyrrolo-, Thienopyrrolo-, Benzothienopyrroloquinolines as well as Triazoloindole Derivatives
Authors: El-Desoky S. I. , Kandeel E. M. , Abd el-Rahmn A. H. , Shmidt R. R. 
Published: February 2015

Abstract
Substituted pyrroloquinoline, thienopyrroloquinoline, benzothieno-pyrroloquinoline and triazoloindole derivatives have been synthesized starting from 6-amino-2,3-diphenylindole. The structures of the newly synthesized compounds and MS data.
On the Metalation of 2,6-Dimethyl-4-tert-butyl-thiophenol
Authors: Kersting Berthold , Steinfeld Gunther 
Published: February 2015

Abstract
Metalation of 2,6-Dimethyl-4-tert-butyl-thiophenol (6) with n-BuLi/TMEDA in THF occurs regioselectively at the benzylic positions to produce lithium 2,6-di(lithiomethyl)-4-tert-butyl-benzenethiolate (7). Treatment of compound 7 with elem ental sulfur followed by iodine-oxidation affords an oxidation product 9a of bis(sulfanylmethyl)- 4-tert-butyl-thiophenol (5).
Untersuchungen zum thermischen Verhalten der Osmiumoxide / Investigation of the Thermochemical Behaviour of Osmium Oxides
Authors: Oppermann H. , Marklein B. 
Published: February 2015

The heterogeneous reactions:
OsO4,s =OsO4,g, 2OsO2,s = Oss + OsO4,g, Oss + 3OsO4,g = 4OsO3,g, OsO2,s + OsO4,g = 2OsO3,g and the homogeneous reaction OsO4,g = OsO3,g + 1/2 O2,g were determined by total pressure measurements. From this and from chemical transport reactions of OsO2 and Os with Osmium tetroxide, the enthalpy of formation of gaseous OsO3 was computed to ΔH°B(OsO3,g,298) = -40,0 ± 3 kcal/mol.
Wechselwirkungen in Molekülkristallen, 147 [1, 2]. Isostrukturelle Wirt/Gast-Einschluß-Verbindungen von N,N'-Ditosyl- p-phenylendiamin mit Aceton, Cyclopentanon, Cyclopent-2-en-l-on, 1,3-Dioxolan, Tetrahydrofuran und 2,5-Dihydrofuran / Interactions in Molecular Crystals, 147 [1, 2], Isostructural Host/Guest-Inclusion Compounds of N,N'-Ditosyl-p-phenylenediamine with Acetone, Cyclopentanone, Cyclopent-2-ene-l-one, 1,3-Dioxolane, Tetrahydrofurane, and 2,5-D ihydrofurane
Authors: Bock Hans , Nagel Norbert , Näther Christian 
Published: February 2015

Abstract
Six isostructural inclusion compounds of various ketone and ether guest molecules into the hydrogen-bonded host-matrix of N,N’-ditosyl-p-phenylenediamine are presented. Crystal growth, structure determinations as well as the arrangement within the clathrates formed is reported and discussed in detail. Packing coefficients and especially the volume ratios between the guest-containig channels and the unit cells allow to estimate the size-limit of guest molecules, which can cocrystallize. Additional crystal growth experiments yield information concerning other types of guest molecules, inclusion from solvent mixtures and guest removal as well as guest exchange processes observed for the N,N′-ditosyl-p-phenylenediamine host matrix.
Four Novel N3O4 Donor Macrocycles and their Lanthanide(III) Complexes
Authors: Bértolo Emilia , Bastida Rufina , Blas Andrés de , Fenton David E. , Macías Alejandro , Rodríguez Adolfo , Rodríguez-Blas Teresa , Villar Ana 
Published: February 2015

Abstract
A new series of lanthanide(III) complexes with two novel Schiff-base macrocycles, L1 and L2, containing a N3O4 donor set have been prepared by cyclocondensation of 2,6-bis(2-formylphen-oxymethyl)pyridine and l,2-bis(2-aminophenoxy)ethane or 1,3-bis(2-aminophenoxy)propane, respectively, in the presence of the appropriate metal salt as a template agent. In the absence of the metal salt the macrocycles are not formed. The diamine macrocycles L3 and L4 are also formed by reaction of the corresponding diamine and dicarbonyl precursors followed by an in situ reduction with NaBH4. Their complexation potential towards Ln(III) ions were also investigated.
Reaktionen des donorfreien (CF3)2Cd mit Phosphor(V)halogeniden: Difluorcarben-Einschiebungen und Direktsynthese von (CF3)3PF2 / Reactions of Donor-Free (CF3)2Cd with Phosphorus(V) Halides: Insertion of Difluorocarbene and Direct Synthesis of (CF3)3PF2
Authors: Eujen Reint , Haiges Ralf 
Published: February 2015

Abstract
Difluorocarbene which is quantitatively eliminated from donor-free bis(trifluoromethyl)- cadmium below 0 °C inserts smoothly into the P-F bonds of PF5 to form (CF3)3 PF2 in high yield. Due to the fast conversion of P-Cl bonds into P-F bonds by cadmium fluoride, PCl5 forms (CF3)3PF2 as well, and a direct synthesis of (CF3)3PF2 with ca. 70 % yield starting from CdEt2, CF3I and PCl5 is reported. Whereas no insertion of CF2 into the axial bonds of (CF3)3PF2 has been detected, reaction of (CF3)2Cd with (CF3)3 PCl2 gives the new tetrakis( haloalkyl)fluorophosphoranes (CF)3 (CF2C1)PF, (CF3)3 (CFCl2 )PF, (CF3)2 (CF2Cl)2PF and (CF3)3 (CCl3)PF. The NMR spectra of these and related compounds and of their hydrolysis products (CF3)3(CF3-nCln)PO are reported. The formation of the higher chlorinated phosphoranes is discussed in terms of an isomerization mechanism presumably involving carbene elimination-reinsertion processes.
Metallkomplexe mit biologisch wichtigen Liganden, CIX [1]. Metallorganische Verbindungen von Platin(II), Ruthenium(II), Rhodium (III) und Iridium (III) mit Oxocarbonyl-N-geschützten a-Am inosäuren und L-Methionylglycinat / Metal Complexes with Biologically Important Ligands, CIX [1]. Organometallic Compounds of Platinum(II), Ruthenium(II), Rhodium(III), and Iridium(III) with Oxocarbonyl-N-protected a-Amino Acids and L-Methionylglycinate
Authors: Prem Markus , Polbom Kurt , Beck Wolfgang 
Published: February 2015

Abstract
The reaction of cis-(Ph3P)2PtCl2 with BOC-N-glycine and FMOC-N-alanine gives the carboxylate coordinated complexes cis-(Ph3P)2 Pt(Cl)(O2CCH2NHBOC) (1) and cis- (Ph3 P)2Pt(Cl)(O2CC(H)(Me)NHFMOC (2). Chloride and proton abstraction from 1 affords the N,O-chelate complex (Ph3P)2Pt(O2CCH2NBOC) (3). From the chloro-bridged compounds [Cp*MCl2]2 (M = Rh, Ir), [(p-cymene)RuCl2]2 and BOC-N-L-MetGlyOH (L) the compounds Cp*M(Cl)2L (4, 5) and (p-cymene)Ru(Cl)2L (6 ) with the mono-dentate dipeptide are obtained which in the presence of NaOMe form O,N,S-bis(chelate) complexes 7 - 9 . The X-ray diffraction analysis of the iridium O,N,S chelate complex 8 shows a five membered and a seven membered chelate ring.
Phosphenium-Komplexe, XXIX [1]. [4+2]-Cycloadditionen von Phospheniumkomplexen des Typs Cp(OC)2W = PR2(R = Alkyl, Aryl) mit 2,3-Dimethylbutadien / Phosphenium Complexes, XXIX [1], [4+2]-Cycloaddition of Phosphenium Complexes of the Type Cp(OC)2W=PR2 (R = Alkyl, Aryl) with 2,3-Dimethylbutadiene
Authors: Malisch Wolfgang , Grün Klaus , Fried Alexander , Reich Wolfgang , Schmeußer Martin , Weis Udo , Baky Christa Abd El , Krüger Carl 
Published: February 2015

Abstract
The phosphenium complexes Cp(OC)2W=PR2 [R = Ph, o-Tol, Me, t-Bu, (2a -d)] react with 2,3-dimethyl-1,3-butadiene (3) via [4+2]-cycloaddition to form the phosphametallacyclohexe­ nes Cp(OC)2W-PR2-CH2-CMe=CMe-CH2 (4a -d). The structure of 4a has been determined by X-ray diffraction.
Benzylgallium-Verbindungen. Die Kristallstrukturen von [Mg3Br2,4Cl1,6(OEt2)6][Ga(CH2Ph)4]2 · 0,5 Toluol und [(3,5-Me2C6H3CH2)2GaBr]2 / Benzylgallium Compounds. The Crystal Structures of [Mg3Br2,4Cl1,6(OEt2)6][Ga(CH2Ph)4]2 · 0.5 Toluene and [(3,5-Me2C6H3CH2)2GaBr]2
Authors: Kopp Mike R. , Neumüller Bernhard 
Published: February 2015

Abstract
[Mg3Br2.4Cl1.6(OEt2)6][Ga(CH2Ph)4]2 · 0.5 toluene (1) can be obtained by the reaction of one equivalent of GaCl3 with four equivalents of PhCH2MgBr in Et2O. Recrystallization of the crude product from toluene at 60°C gives colorless crystals of 1. Treatment of GaCl3 with two equivalents 3,5-Me2C6H3CH2MgBr in Et2O gives after recrystallization from toluene the diorganogallium bromide [(3,5-Me2C6H3CH2)2GaBr]2 (2). 1 and 2 were characterized by NMR, IR and MS techniques as well as by X-ray structure analyses. 1 consists in the dication [Mg3Br2.4C1.6(OEt2)6]2+, two gallate units [Ga(CH2Ph)4]- and a toluene molecule, disordered around a center of inversion. 2 forms centrosymmetric dimers [(3,5-Me2C6H3CH2)2GaBr]2.
Die Kristallstruktur von [Me3PN(H)PMe3]4l28, einem Polyiodid mit I3--, l82-- und I14
4--Ionen Crystal / Structure of [Me3PN(H)PMe3]4I28, a Polyiodide with I3-, I8
2- , and I 14
4- Ions
Authors: Gröb Thorsten , Weller Frank , Dehnicke Kurt 
Published: February 2015

Abstract
Black-red single crystals of [Me3PN(H)PMe3]4I28 have been prepared by the reaction of [Me3PNPMe3]I with iodine in dichloromethane solution in the presence of Me3SiI and traces of water. The polyiodide crystallizes triclinically in the space group P1̄ with two formula units per unit cell with the lattice dimensions a = 831.2(1), b = 1661.2(3), c = 1739.0(3) pm, α = 87.26(1)°, β = 79.48(1)°, γ = 78.17(1)°. The structure consists of [Me3PN(H)PMe3]2+ ions, linear I3- ions, z-shaped I82- ions, and zig-zag chains of I14
4- ions, the terminal iodine atoms of which form I···H-N hydrogen bridges to the cations.
The First Hydrogen Containing (Polyfluorocycloalken-l-yl)xenon(II) Salts
Authors: Frohn H.-J. , Bardin V. V. 
Published: February 2015

Abstract
(2-H-Hexafluoro-1,4-cyclohexadien-1-yl)xenon(II) and (2-H-octafluorocyclohexen-1-yl)xenon(II) hexafluoroarsenates and tetrafluoroborates were obtained together with their perfluorinated analogues on reacting the corresponding (2,3,4,5-tetrafluorophenyl)xenon(II) salts with XeF2 in anhydrous HF (aHF). The fluorinated (cyclohexen-1-yl)xenon(II) cations react with bromide and iodide anions in MeCN and aHF under alkenylation of the halide anions.
Tetrakis(sulfurdiimido)silane, -germane and -stannane
Authors: Herberhold Max , Gerstmann Silke , Wrackmeyer Bernd 
Published: February 2015

Abstract
Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = tBu 1a, SiMe3 1b)], two germanes [Ge(NSNR)4 (R = tBu 2a, SiMe3 2b)] and one stannane [Sn(NSNtBu)4Sn 3a] were prepared and characterised by 1H, 13C, 15N, 29Si and 119Sn NMR spectroscopy in solution, and 3a was also studied in the solid state by 119Sn CP/MAS NMR. Whereas 1a,b and 2a,b are monomeric in solution, the 119Sn NMR data suggest that 3a is associated both in solution and in the solid state, and that the tin atoms are hexa-coordinated. The attempted stepwise synthesis of 1a by using one, two, three or four equivalents of K[(NSN)tBu] led to mixtures of 1a with Cl3Si(NSNtBu) 4a, Cl2Si(NSNtBu)2 5a, and ClSi(NSNtBu)3 6a. Only one sulfurdiimido ligand of the silane 1a reacted with hexachlorodisilane by oxidative addition and cleavage of the Si-Si bond to give the new heterobicyclic derivative 7a which is held together by two different coordinative N-Si bonds.
Synthese und Charakterisierung von kronenetherstabilisierten Platin(IV)- Komplexen mit Aminosäureliganden / Synthesis and Characterization of Amino Acid Complexes of Platinum(IV) Stabilized by Crown Ethers
Authors: Steinborn Dirk , Gravenhorst Olaf , Junicke Henrik , Heinemann Frank W. 
Published: February 2015

Abstract
Crown ether complexed pentachloro(aqua)platinic acid, (H3O)[PtCl5(H2O)]·2(18-cr-6)·6H2O (1) reacts with glycine, L-alanine, and DL-2-aminobutyric acid to give cis-[PtCl4(O-glyH)(H2O)]·(18-cr-6)·H2O (4a)1 and cis-[PtCl4(O-amacH)(H2O)]·(18-cr-6) (amacH = alaH 4b, abuH 4c), respectively, as well as (amacH2)2[PtCl6]·2(18-cr-6) (amacH = glyH 5a, alaH 5b, abuH 5c). The crown ether complexed hexachloroplatinic acid, (H3O) 2[PtCl6]·2(18-cr-6) (2), reacts with glycine to afford (glyH2)[PtCl4(N,O-gly)]·2(18-cr-6)·1.25H2O (6).
The structures of 4b and 6 were determined by X-ray diffraction. The alanine ligand in 4b is a zwitterion that is coordinated to platinum by one oxygen atom of the carboxylate group only. The other oxygen atom is engaged in a strong hydrogen bond to the ds-coordinated aqua ligand. The glycinato ligand in 6 is N, O-coordinated at platinum forming an anion [PtCl4(N,O-gly)]- . The other oxygen atom of the carboxylate group is involved in a strong hydrogen bridge to the cation (glyH2)+. In both complexes hydrogen bridges are formed between the -N+H3 and -NH2 groups of the amino acid ligands and the oxygen atoms of the crown ether molecules.
Onio-assistierte SN2-Reaktionen: Allgemeiner Zugang zu symmetrischen und unsymmetrischen geminal bisoniosubstituierten Methanderivaten / Onio-Assisted SN2-Reactions: General Access to Symmetrical and Unsymmetrical Geminally Bisonio Substituted Methane Derivatives
Authors: Weiss Robert , Handke Matthias , Reichel Silvia , Hampel Frank 
Published: February 2015

Abstract
The arsonium salt [Ph3As-CH2-OTf]+ OTf- 11a contains a 1,1-biselectrophilic Csp3 center which permits to synthesize a wide range of symmetrical and unsymmetrical geminally bisonio-substituted methane derivatives. With neutral nucleophiles INu under mild condi- tions a series of 1.1-bisonium salts [Ph3As-CH2-Nu]2+ 2OTf- 12-23 is obtained in good yields. Under more stringent conditions the triphenylarsonio function in these salts can also be mobilized as a nucleofuge in a subsequent SN-reaction with a second nucleophile | Nu’, yielding a series of novel unsymmetrical 1,1-bisonium salts [Nu-CH2-Nu’]2+ 2OTf- 24-27. Structures 18, 23 and 26b were confirmed by X-ray analysis. For certain nucleophiles a discrete stepwise substitution of both nucleofuges in 11a cannot be realized and the corresponding symmetrical 1,1-bisonium salts (e.g. 28 and 30-32) are obtained directly. The experimental material can be rationalized on the basis of a simple MO model. The conclusion is that stabilization of a hypervalent SN2 transition state by an equatorial oniosubstituent parallels the stability of the underlying ylids. This is corroborated by model calculations. The geminal bisonium salts reported are potential precursors to mono- and 1,1-bisylids and, in special cases, to functional nucleophilic carbenes.
Anodic Methoxylation of Isatin
Authors: Niedźwiecka-Kornaś Anna , Bojarska Elżbieta , Kamiński Jarosław , Kazimierczuk Zygmunt 
Published: February 2015

Abstract
Anodic metoxylation of isatin was investigated. The product formed contained a unique 3a.7a-dihydroindole ring system. 3a,7a-Dihydro-(Z)-3a,7a-dimetoxyisatin was isolated and characterized with a variety of spectroscopic methods.
Fe[B2P2O7(OH)5]: Ein neues Boro-phosphat mit unverzweigten Vierer-Einfach Tetraederketten / Fe[B2P2O7(OH)5]: A New Borophosphate Containing Non-Branched Tetrahedral Vierer-Einfach Chains
Authors: Boy Insan , Hauf Cornelia , Kniep Rüdiger 
Published: February 2015

Abstract
Single crystals of Fe[B2P2O7(OH)5] were grown under hydrothermal conditions at 170 °C. The crystal structure (monoclinic, C 2/c (Nr. 15), a = 1774.7(5), b = 672.0(2), c = 705.9(2) pm, β = 109.01(2)°, Z = 4, Dx= 2.808 g/cm3) contains vierereinfach tetrahedral chains 1
∞[B2P2O7(OH)5]3-, which are formed by alternating borate and phosphate groups connected via common corners: 1
∞[BO2/2(OH)(OH0.5)-PO2/2O(OH)-BO2/2(OH)-(OH0.5)-PO2/2O(OH)]. Fe3+ is in an octahedral coordination (Fe(O)2(OH)4).
Polysulfonylamine, CIII [1] Ein Hydroxylamin mit bemerkenswert kurzer O-N-B Bindung: Kristall- und Molekülstruktur von MeO-N(SO2Me)2 / Polysulfonylamines, C III [1] A Hydroxylamine with a Remarkably Short O-N Bond: Crystal and Molecular Structure of MeO-N(SO2Me)2
Authors: Näveke Martina , Blaschette Armand , Jones Peter G. 
Published: February 2015

Abstract
The crystal structure of the known title compound was determined by low-temperature X-ray diffraction (orthorhombic, space group Pbcn, Z = 4). The molecule displays an unusually short O-N bond, a relatively long C-O bond and a moderately pyramidal O-NS2 skeleton (O-N 133.1, C-O 148.5 pm, sum of bond angles at N: 347.4°).
Modeling of Grout Propagation in Transparent Replica of Rock Fractures
Authors: Sui Wanghua , Qu Hao , Gao Yue 
Published: February 2015

Abstract
This paper presents an experimental investigation on the injection of chemicals into rock fractures by using a transparent replica to visualize grout propagation. The fractured rock mass is simulated by using fused silica blocks, fused silica grains and mineral oils. Fused silica blocks in a cubic form are used to form rock mass and the fused silica grains are used to fill the space between these blocks to simulate fractures with a certain aperture. In addition, a mixed mineral oil that has the same refractive index as that of the fused silica blocks and grains is used to simulate fluid and groundwater. The experimental setup consists of a Plexiglas container, loading frame, grout injection system, and three black and white charge-coupled device (CCD) cameras. A modified urea-formaldehyde resin and an acid solution are mixed together as the grout. The point source of the grouting is simulated by using an injection needle inserted into the model. As the silica blocks are impermeable, the grout instead propagates into the fractures that are filled with silica sand. Propagation images during the grouting are captured by using the CCD cameras. Digital image processing is then applied to analyze the grayscale pictures to detect the edge of the grout front and calculate the grout penetration length at different times. The shape of the boundary of the grout–groundwater interface is found to be spherical when the fractures are filled with porous transparent materials. The results indicate that the flow velocity calculated by using a modified cubic law is in good agreement with the measured penetration length in the images. The results also verify the possibility of the use of a transparent replica to visualize grout propagation inside a fractured rock mass so as to understand grout propagation during grouting.