bluuebunny/crossref_metadata_2025_split huggingface dataset:
Synthese und 13C-NMR-Spektren tert-butylierter Cyclohexenon-Epoxide Synthesis and 13C NMR Spectra of tert-Butylated Cyclohexenone Epoxides
Authors: Albert Klaus , Schneider Hans-Peter , Koch Dieter , Rieker Anton 
Published: February 2015

Abstract
NMR spectra of several cyclohexenone epoxides obtained by oxygenation of 4-R-2,6-di-tert-butylphenols have been assigned, using substituent induced shifts, offresonance and C - H single-frequency-decoupling techniques, as well as completely C - H coupled spectra. For the -butyl signals the following sequence rules are relevant: methyl carbons and protons = δtBu-C-olefinic(sp2) > δtBu-C-oxirane(sp3) ≥ δtBu-C-OH(sp3); quaternary carbons = δtBu-C-OH(sp3) > δtBu-C-olefinic(sp2) > δtBu-C-oxirane(sp3). In these compounds, the oxirane oxygen causes a highfield shift of the signal of the quaternary C-atom of the feri-butyl group as compared with the influence of a hydroxy group.
Persäureoxidation von Schwefel-Stickstoff-Verbindungen zu Sulfoxiden1 / Oxidation of Sulfur-Nitrogen Compounds to Sulfoxides by Peroxyacids1
Authors: Steudel Ralf , Rose Fritz 
Published: February 2015

Abstract
Trifluoroperoxyacetic acid reacts in 80% yield with (S7N)2S to give colorless crystals of the known (S7N)2SO, and with S7NH to give the formerly unknown unstable hepta-sulfurimide 3-oxide, S7NHO, the properties and vibrational spectra of which are reported.
Neue Silaza-und Silaoxaza-spiro[4.4]nonane und [4.5]decane / Novel Silaza-and Silaoxaza-spiro[4,4]nonanes and [4,5]decanes
Authors: Wannagat Ulrich , Eisele Gerd 
Published: February 2015

Abstract
The formerly unknown spiro systems C-F (Scheme I) with silicon in the spiral center and C, Si, N and O in the framework were synthesized via reactions 2-6 and confirmed in their structure by elemental analysis and spectroscopic data (Table I).
Tl6Ag2I10, ein Polyiodid mit Ag2-Paaren Darstellung, Eigenschaften und Kristallstruktur / Tl6Ag2I10, a Polyiodide with Ag2 Pairs Preparation, Properties, and Crystal Structure
Authors: Stoeger W. , Rabenau A. 
Published: February 2015

Abstract
Tl6Ag2I10 forms hexagonal crystals with metallic luster. Under its own I2-pressure the m.p. is 302 °C. In vacuum or under inert gas Tl6Ag2I10 decomposes above 170 °C forming 1 mole of I2. The space group is P6̄2c with the lattice constants a = 10.480 Å, c = 13.415 Å and Z = 2. Tl6Ag2I10 is built up by a framework of Tl6I6 with channels parallel to the c-axis. These channels contain Ag2 pairs with an Ag-Ag distance of 2.98 Å and I4
2- -polyiodide ions, respectively.
The Bimolecular Decay of the α - Hydroxymethylperoxyl Radicals in Aqueous Solution
Authors: Bothe Eberhard , Schulte-Frohlinde Dietrich 
Published: February 2015

The bimolecular decay of the hydroxymethylperoxyl radical in aqueous solution (k = 2.1 x 109 M-1s-1) leads mainly (80%) to one molecule of hydrogen peroxid and to two molecules of formic acid.
2 HOCH2OO· → H2O2 + 2 HCOOH
Deuterium kinetic isotope effects show that the decay occurs at room temperature via a short lived (τ < 10-4 s) tetroxid.
Complexes of Oxamic Acid with Al(III), Ga(III), In(III), Tl(III), Y(III), Fe(III), Mn(II) and V(III)
Authors: Kouinis J. K. , Tsangaris J. M. , Galinos A. G. 
Published: February 2015

The preparation of complexes of oxamic acid with Al(III), Ga(III), In(III), Tl(III), Y(III), Fe(III), Mn(II) and V(III) is reported. From the study of the infrared and diffuse reflectance spectra and the magnetic moments (for the complexes of Fe(III), Mn(II) and V(III)) it is concluded that in all complexes the metal ion is coordinated with the carboxyl oxygen and the amidic nitrogen, after the ionization of one of the amidic hydrogens.
Octahedral structures are proposed for all the complexes of the trivalent metal ions and the complex K2{Mn(oxamic)2} · 2 H2O.
Darstellung und Molekülstruktur von 2-Methylthio-1,3,2-benzodithiastibol / Preparation and X-ray Structure of 2-Methylthio-1,3,2-benzodithiastibole
Authors: Wieber Markus , Burschka Christian , Baudis Ulrich 
Published: February 2015

Starting with SbCl3 and 1,2-benzenedithiol, one can easily obtain heterocyclic 2-chloro- 1,3,2-benzodithiastibole [1], which, without isolation, can be treated with a solution of sodium methanethiolate to yield 2-methylthio-1,3,2- benzodithiastibole. Yellow crystals were obtained by recrystallization from acetonitrile. The compound was found to be monomeric in benzene solution.
The crystal structure was solved by means of X-ray diffraction methods and could be refined to an R-value of 0.03 with 870 independent reflections observed. The monoclinic unit cell contains 4 formula units, the space group is P21/c. The structure can be compared with that of 2-methoxi-1,3,2-benzodioxastibole, a preliminary report of which has been given [2]. The compounds are, however, not isomorphous. Interactions between neighbouring molecules in the thiastibole seem to be significantly weaker than in the corresponding oxygen compound.
Eine neuartige Assoziation zwischen Kalium und komplex gebundenem DistickstofF -Struktur von KN2Co(PMe3)3 /A Novel Association of Potassium and Co-ordinated Dinitrogen - Crystal Structure of KN2Co(PMe3)3
Authors: Klein Hans-Friedrich , Hammer Reinhard , Wenninger Josef , Friedrich Peter , Huttner Gottfried 
Published: February 2015

Abstract
[(Me3P)3CoN2]2Mg(THF)4 reacts with potassium metal to give [KN2Co(PMe3)3]6. The same compound is obtained via substitution of olefin in cobaltates K+[Co(olefin)(PMe3)3]- by molecular nitrogen under ambient conditions. Infrared data show that association is preserved even in ether solvents. The stability of cobaltates [Co(PMe3)3L]- increases in the order L = olefin < dinitrogen < PMe3.
Reactions of the title compound proceed as oxidative additions to the monomer with loss of molecular nitrogen. Methyl iodide and allyl bromide yield the fluxional complexes CoCH3(PMe3)4 and η3-C3H5Co(PMe3)3, respectively. Ethyl bromide gives
cis-CoH(C2H4)(PMe3)3 via β-elimination and coordination of ethylene. The molecular structure of [KN2Co(PMe3)3]6 reveals a novel type of cluster: a double cube made up from six KN2 units with six exo-Co(PMe3)3 groups (d(NN) = 116-118 pm, d(CoN) = 170-171 pm).
Tetraisopropylchrom als Ausgangsmalerial zur Synthese von Chromkomplexen /Tetraisopropylchromium as Starting Material for the Synthesis of Chromium Complexes
Authors: Müller Jörn , Holzinger Walter 
Published: February 2015

Abstract
The title compound reacts with σ-donor ligands L (e.g. CO, alkylisocyanides) in THF with formation of CrL6 complexes. From the interaction of Cr(i-C3H7)4 with 1,3-cyclohexadiene no products could be isolated, but with cycloheptatriene in THF (cycloheptadiene)(cycloheptatrienyl)chromium(-I) is produced together with (cycloheptadienyl)-(cycloheptatrienyl)chromium(O). Both complexes may be converted into each other via the cation [C7H9CrC7H7]+ . Reaction of Cr(i-C3H7)4 in THF with 1,3,5-cyclooctatriene yields bis(cyclooctadienyl)chromium(II) and (cyclooctadienyl)(cyclooctatriene)chromium(I) as well as (μ-cyclooctatetraene)bis(cyclooctatriene)dichromium(0) which in solution shows dynamic behaviour similar to tris(cyclooctatetraene)dichromium(0). The products obtained from reactions of Cr(i-C3H7)4 with cyclo-oligo-olefins differ from those formed via the “isopropyl-Grignard synthesis”.
Darstellung, Kristallstruktur und Infrarotspektrum von [MoNCl3 · POCl3]4/Preparation, Crystal Structure and Infrared Spectrum of [MoNCl3 · POCl3]4
Authors: Strähle Joachim , Weiher Ulrich , Dehnicke Kurt 
Published: February 2015

Abstract
[MoNCl3 · POCl3]4 is prepared both by the reaction of MoNCl3 with POCl3 as well as by the reaction of MoCl5 with NCl3 in the presence of POCl3. [MoNCl3 · POCl3]4 crystallizes in the monoclinic space group P21/c with 2 tetrameric molecules in the unit cell. The crystal structure was solved by X-ray diffraction methods (R = 0.033, 1821 observed reflections). The structure consists of planar and almost square Mo4N4-eight-membered rings with alternating Mo-N bond lengths. The distorted octahedral environment of the molybdenum atoms is completed by three terminal Cl-ligands and by the oxygen atom of a POCl3 molecule, which is coordinated trans to the Mo ≡ N triple bond. The IR spectrum is discussed with respect to the vibrational spectra of the isoelectronic niobium complex [NbOCl3 · POCl3]4.
CH3NH3PbX3, ein Pb(II)-System mit kubischer Perowskitstruktur / CH3NH3PbX3, a Pb(II)-System with Cubic Perovskite Structure
Authors: Weber Dieter 
Published: February 2015

Abstract
CH3NH3PbX3 (X = Cl, Br, I) has the cubic perovskite structure with the unit cell parameters a = 5,68 Å (X = Cl), a = 5,92 A (X = Br) and a = 6,27 A (X = I). With exception of CH3NH3PbCl3 the compounds show intense colour, but there is no significant conductivity under normal conditions. The properties of the system are explained by a "p-resonance-bonding". The synthesis is described.
The Structure Model of an Inorganic Ion Exchanger Cobalt(II)-hexacyanoferrate(II)
Authors: Ćeranić T. 
Published: February 2015

Abstract
Cobalt(II)-hexacyanoferrates(II) with incorporated monovalent Na+, K+ , NH4
+ and Cs+ ions have been synthetized. Chemical composition and structure of the unit cell of the crystallites have been determined by X-ray and IR analysis. It has been found that all crystallites containing the monovalent cations are isomorphous having an FCC structure, whereas the cobalt(II)-hexacyanoferrate(II) crystallites tetragonally. In order to explain the properties of these crystallites (which are similar to zeolites) causing their selectivity to monovalent cations, a structure model has been proposed. The values of effective radii of the "cages" and their entrances have been calculated.
Reactions of t-Butyl Peresters, XVIII Peroxyester Reaction of t-Butyl N,N-Dimethylperoxyamidate
Authors: Rawlinson David J. , Konieczny Maria , Sosnovsky George 
Published: February 2015

Abstract
The thermal copper ion catalyzed peroxyester reaction of t-butyl N,N-dimethylperoxyamidate (1, R = N(CH3)2) with cyclohexene results in the formation of the corresponding N,N-dimethylamidate 6 in 20% yield, and 3,3′-dicyclohexenyl (5) in 40% yield. Under

analogous conditions, the reaction of 1, R = N(CH3)2, with tetrahydrofuran gives the corresponding amidate 7 in 6% yield. Only a 2% yield of 6 and no 7 were isolated in the

photochemical variant of the peroxyester reaction. Compound 6 is also obtained in a 12% yield from the reaction of 2-cyclohexen-1-ol (9) with N,N-dimethyl carbamoyl chloride (4) in the presence of pyridine.
Notizen:Ein Bis(perfluorpinakolyl)spirophosphoran/A Bis(perfluoropinacolyl)spirophosphorane
Authors: Röschenthaler Gerd-Volker , Sauerbrey Karl , Schmutzler Reinhard 
Published: February 2015

Abstract
Phenyl-bis(perfluoropinacolyl)phosphorane could be obtained by reacting difluoro-phenyl -perfluoropinacolylphosphorane with dilithium-perfluoropinacolate or by oxidative addition of hexafluoroacetone to phenyl-perfluoropinacolyl-phosphine. The 19F NMR shows nonrigidity of the molecule.
Darstellung und Strukturuntersuchung von Polywolframaten Ein Beitrag zur Aufklärung des Parawolframations A / Preparation and Structure Investigation of Polytungstates A Contribution to the Paratungstate A Problem
Authors: Fuchs Joachim , Flindt Ernst-Peter 
Published: February 2015

Abstract
Polytungstates are obtained by the reaction of hydrated tungsten (VI) oxide with bases or salts after occasional addition of organic solvents. With liquid ammonia the as yet unknown ditungstate, (NH4)2W2O7, is produced. Its IR spectrum has few absorption bands suggesting a very simple constitution. Piperidine yields 5 compounds according to varied experimental conditions, which all exhibit approximately paratungstate compositions but different crystal habits, lattice parameters, solubility and IR spectra. Structure determinations indicate that two of these compounds are heptatungstates, the anion of which, W7O24
6-, has the same structure as the heptamolybdate ion, Mo7O24
6-. From a comparison of their Raman spectra with the spectrum of a freshly acidified sodium tungstate solution (designated as Paratungstate A) it may be concluded that the heptatungstate ion is the predominant species in such a solution. The anion structure of the previously described tributylammonium(5:24):tungstate [(C4H9)3NH]5H3W12O40 was elucidated by X-ray methods. Here the tungsten atoms show the same arrangement as in the α-dodecatungstatophosphate ion (Keggin structure).
Beiträge zur Chemie des Schwefels, 116 [1]Kristall-und Molekülstrukturen von 1.2.4.5-Benzotetrathiepin und 3-Methyl-1.2.4.5-benzotetrathiepin / Contributions to the Chemistry of Sulfur, 116 [1]Crystal and Molecular Structures of 1,2,4,5-Benzotetrathiepine and 3-Methyl-1,2,4,5-benzotetrathiepine
Authors: Fehér F. , Engelen B. 
Published: February 2015

Abstract
The structures of 1,2,4,5-benzotetrathiepine and 3-methyl-1,2,4,5-benzotetrathiepine were determined by X-ray structure analysis. The constitution of the molecules, which was proposed by way of spectroscopic data, could be verified. The conformation of the seven-membered rings is the chair form. The position of the methyl group in 3-methyl-1,2,4,5-benzotetrathiepine is equatorial with respect to the seven-membered ring. Details of the conformations are discussed. Bond distances and angles are compared with those in other molecules, which have similar structures.
Complexes of Cu(II) and Ni(II) with N, N′-(Dipicolyl) 1,8-naphthylenediamine
Authors: Tsangaris J. M. , Perlepes S. , Galinos A . G. 
Published: February 2015

Abstract
The preparation of the new compound N,N′-(dipicolyl)1,8-naphthylenediamine = DPNAP is reported which can serve as a tetradentate ligand.
Complexes of DPNAP with Cu(II) and Ni(II) were prepared and their IR , visible UV spectra and magnetic moments were investigated.
Solvolytic Studies on Methylnorbornyl Systems: Investigations on the Synthesis of 2-Exo-methyl-6-norbomylideneacetic Acid
Authors: Radhakrishnan J. 
Published: February 2015

Abstract
3-Nortricyclyl bromide (11) was transformed in four steps to norbornan-3,6-dione (10). Methyl 4-hydroxy-2-butynoate (19) was prepared from propargyl alcohol and its alkylation reactions with 3-methylcyclopentanone investigated. Methyl 4,4,5-triethoxycarbonylpentanoate (22) was obtained by the sequential alkylation of diethyl malonate with ethyl bromoacetate and methyl acrylate, and its base catalysed cyclization studied. Cyclopentadiene was converted to 2-exo-methylnorbornan-6-one (17) in eleven steps.
Trimethylzinnazid und Trimethylzinnazid · Trimethylzinnhydroxid / Trimethyltin Azide and Trimethyltin Azide-Hydroxide
Authors: Müller Joachim 
Published: February 2015

Abstract
(CH3)3SnN3 (1) and (CH3)3SnN3 · (CH3)3SnOH (2) were characterized by physical and spectroscopic properties. In solution the azido groups show a temperature dependent site exchange.
Kristall- und Molekülstruktur des dimeren (Tetramethylcyclobutadien)dibromo-nickel(II) / Crystal and Molecular Structure of the Dimeric (Tetramethylcyclobutadiene)dibromo-nickel(II)
Authors: Thewalt Ulf , Hemmer Reinhard , Brune Hans Albert 
Published: February 2015

Abstract
The title compound, A, has been prepared from the corresponding chloro complex by reaction with potassium bromide in aqueous solution. A crystallizes in the monoclinic space group P21/n with Z = 2 and lattice parameters a = 11.748(5), b = 10.419(4), c = 8.383(4) Å and β = 95.35(5)°. An X-ray analysis shows that A posseses crystallographic symmetry 1̄, that within the limits of error, the π-bonded cyclobutadiene ring is a square with an average C-C bond distance of 1.464 Å, and that the methyl groups are displaced away from the nickel atom, the average distance between the ring plane and the methyl C atoms being 0.20 Å.
Salts of Ferricinium Cation and its Homologues: NMR Investigation, I On Mechanisms of Spin Derealization in Salts of Ferricinium and 1,1′-Dimethylferricinium Cation
Authors: Lyatifov U'tifat R. , Solodovnikov Stanislav P. , Babin Valery N. , Materikova Rosa B. 
Published: February 2015

Abstract

1H and 13C NMR spectra of hexafluorophosphates of ferricinium (1) and 1,1′-dimethyl -ferricinium cations (2) and the EPR spectrum of 2 were recorded. Pseudocontact and contact contributions of isotropic shift were calculated and constants of hyperfine inter-action estimated according to Jesson. It is shown that the calculations of pseudocontact and contact shift via magnetic susceptibility components according to Kurland and McGarvey do not change the signs of HFS constants. According to the suggested mecha-nisms of spin derealization the π-contribution is the dominating one.
Dimethylhalonium-Ionen in Aluminiumhalogenid/Methylhalogenid-Lösungen / Dimethylhalonium-Ions in Aluminium Halide/Methyl Halide Solutions
Authors: Brüggeller Peter , Mayer Erwin 
Published: February 2015

Abstract
Evidence for the formation of (CH3)2Br+ and (CH3)2I+ in CH3Br and CH3I solutions saturated with AlBr3 comes from the appearance of a second singlet in the 1H NMR spectrum. The (CH3)2Br+ ion is formed at -40 °C to about 5 mol%, the (CH3)2I+ ion at -12 °C with 50 mol% yield. At higher temperatures the concentration of the halonium ions decreases rapidly. The (CH3)2Br+ ion is not detectable at room temperature, the concentration of (CH3)2I+ decreases to about 30 mol%. Dilution of the saturated solutions with methyl halide also reduces the halonium ion concentration. An AlBr3/CH3Br solution with a molar ratio of 1:3 at -40 °C shows no sign of (CH3)2Br+ formation in the XH NMR spectrum. Both effects are best explained by formation of dimethylhalonium ions from the adduct CH3X-AIX3 and by dependence of adduct concentration on temperature and dilution. Exchange of (CH3)2Br+ and (CH3)2I+ with methyl halide is slow on the NMR time scale at low temperatures similar to the results in SbF5/SO2. The 1H NMR singlets of (CH3)2Br+ and (CH3)2I+ are shifted to lower field by 1.32 and 1.68 ppm in comparison with the chemical shifts in SbF5/SO2 solution
Untersuchungen an quartären Pyridiniumsalzen, IX [1] Pyridiniumsalze mit Amidingruppe. Darstellung und Reaktion mit Base / Investigations of Quaternary Pyridinium Salts, IX [1] Pyridinium Salts with Amidine Group. Preparation and Reaction with Base
Authors: Gündel Wolf-Hellmut 
Published: February 2015

Abstract
3-Pyridinecarboximidamide gave with alkylating agents quaternary salts (2), that rearrange on addition of anionic base to 2-amino-pyridinecarbaldehyde (3). Derivatives of 3 can be obtained by reaction of 3-cyano-pyridinium salts with primary amine on addition of anionic bases
Darstellung und Kristallstruktur von Ca9Mn4Bi9 und Ca9Zn4Bi9 /Preparation and Crystal Structure of Ca9Mn4Bi9 and Ca9Zn4Bi9
Authors: Brechtel Erwin , Cordier Gerhard , Schafer Herbert 
Published: February 2015

Abstract
The new compounds Ca9Mn4Bi9 and Ca9Zn4Bi9 crystallize in the orthorhombic system (Pbam) with
Ca9Mn4Bi9: a = 2242 ± 2 pm, b = 1256 ± 1 pm, c = 472 ± 1 pm,
Ca9Zn4Bi9: a = 2212 ± 2 pm, b = 1264 ± 1 pm, c = 465 ± 1 pm.
In the structure of the isotypic compounds there are Mn(Zn)Bi4-tetrahedra connected to chains by common corners. Four of these chains are connected by common comers to „Einervierfachketten“ in Liebau’s nomenclature for inosilicates.
Ion Exchange Equilibria of Cobalt(II)-M-hexacyanoferrates(II) with K, NH4 and Cs
Authors: Ćeranić T. S. , Adamović R. 
Published: February 2015

Abstract
The inorganic ion exchanger cobalt(II)-M-hexacyanoferrate(II), M = K, NH4 and Cs, and its selectivity for the alkali metal ions are defined by their isotherms at three different temperatures and by the calculated thermodynamic functions ΔG°, ΔH° and ΔS°. The thermodynamic data are discussed on the basis of the radii of competing ions as well as on the steric limitations of the ion exchanger phase, i.e., the thermodynamic magnitudes which control the selectivity of those ion exchangers.
Synthese von Derivaten des 1-Adamantylbenzols /Synthesis of Derivatives of 1-Adamantylbenzene
Authors: WeiB Jörn-Volker , Wray Victor , Schmutzler Reinhard 
Published: February 2015

Abstract
p-Di(1-adamantyl)benzene (6a), a mixture of the m- and p-isomers of 1-adamantyl-toluene (6b), and p-(l-adamantyl)bromobenzene (6c) were obtained in a Friedel-Crafts type reaction from 1-adamantyl fluoride and benzene, toluene, bromobenzene, respectively, in the presence of the Lewis acid phenyltetrafluorophosphorane. Characterisation of the products -all previously described in the literature -was by analysis and 13C NMR spectroscopy.
Photodimerisation of Amidopyrine [1,2] An Example of [2+2] Photocycloaddition of an Enamine-Like Structure
Authors: Reisch J. , Abdel-Khalek M. 
Published: February 2015

Abstract
The photochemical behaviour of amidopyrine (1) in cyclohexane was studied. The photodimer (2) and three fragmentation products (3-5) could be isolated and identified with the help of spectroscopic methods. The participation of 4-pyrazolin-3-ones in photochemical cycloadditions is demonstrated for the first time.
XPS Spectra of Spin-Triplet Cobalt(III) Complexes
Authors: Brown Dennis G. , Weser Ulrich 
Published: February 2015

Abstract
The X-ray photoelectron spectra of cobalt(III) complexes in an unusual spin triplet state are reported. The binding energies in the 2P spectral region are somewhat low and the spectra exhibit rather strong satellite structure. The Co 2P1/2-CO 2P3/2 separations and satellite intensities appear to be related to the magnetic moments of the complexes as has been suggested previously for cobalt(II) compounds.
Redoxreaktion zwischen Chinolinium-Salzen und Alkoholaten / Redoxreaction between Quinolinium Salts and Alcoholates
Authors: Gündel Wolf-H. , Berenbold Helmut 
Published: February 2015

Abstract
Quinolinium Salts, Redox Reactions Quaternary salts of 3-quinolinecarboxamide and 3-quinolinecarbonitrile react after addition of ZnCl2 with ethanol (or 2-propanol) to the corresponding 1,4-dihydroquinoline and ethanol (or propanone). This hydride transfer can be achieved with aluminium-triisopropoxide, too. Lipophilic insertionproducts (4,5,7,8) react with ethanol (or 2-propanal) after ZnCl2 addition to quinolinium-alcoxides, and then to the 1,4-dihydro-quinoline and ethanal (or propanone).
Notizen: Sr3Al2Sn2 und Ba3Al2Sn2 - ternäre Stannide im Ta3B4-Strukturtyp / Sr3Al2Sn2 and Ba3Al2Sn2 - Ternary Stannides in the Ta3B4-Structure
Authors: Widera Axel , Schäfer Herbert 
Published: February 2015

The new compounds Sr3Al2Sn2 and Ba3Al2Sn2 crystallize in the orthorhombic system (Immm-D2h
25) with
Sr3Al2Sn2: a = 446.5 ± 1 pm,
b = 1979.5 ± 2 pm,
c = 494.4 ± 1 pm,
Ba3Al2Sn2: a = 459.4 ± 1 pm,
b = 2063.4 ± 2 pm,
c = 523.0 ± 1 pm,
and build up an ordered variant of the Ta3B4- structure type.
Fluorescein-photosensitized Furan Oxidation in Methanolic and Reversed Micellar Solutions, Part II Kinetic Analysis
Authors: Miyoshi Norio , Tomita Giiti 
Published: February 2015

Abstract
The 1,3-diphenylisobenzofuran oxidation was investigated in methanolic and dodecyl-ammonium propionate reversed micellar solutions using fluorescein sodium as photosensitizer. The furan oxidation was caused by the singlet oxygen mechanism (Type II). Aniline enhanced remarkably the furan oxidation in methanolic solutions, but inhibited highly this oxidation in the reversed micellar solutions. This enhancement of the furan oxidation was considered to be brought about by the occurrence of a radical mechanism (Type I) besides Type II mechanism. No Type I reaction occurred in the micellar solutions. The rate constants concerning with both reaction processes were evaluated by kinetic analysis, employing various aryl-and alkyl-amines. The reaction mechanism of Type I and the quenching mechanism of singlet oxygen by amines were discussed from the relationship between the rate constants, and the ionization potential of amines and the solvent polarity.