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1975 (239)
61Author    Requires cookie*
 Title    Spektroskopische Untersuchungen von Addukten aromatischer Schiff-Basen The R eactivity of the C = N Double Bond Systems, I I 1 Spectroscopy of Adducts from Aromatic Schiff-Bases  
 Abstract    G e o r g U ray und E r i c h Z i e g l e r N-Benzylidene-aniline, Adducts, Immonium-salts, X H NMR, 13C NMR The adducts from carboxylicacid chlorides and -anhydrides of aromatic Schiff-Bases differ fundamentally in their spectroscopic behavior compared with the hydrochlorides. A real addition on the azomethine double-bond is shown by JH NMR, 13C NMR and UV spectroscopy. 
  Reference    (Z. Naturforsch. 30b, 245—248 [1975]; eingegangen am 9. Dezember 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0245 
 Volume    30 
62Author    ChRequires cookie*
 Title    'ÖCÖr  
 Abstract    (0 E t) 3 , -'N H , R1' . -. R2 2 R2 R2 5 a -d (a-d a: R1 = R2 = H c: R' = H, R2= C6H5 d: R1-R2= (CH2)c 
  Reference    (Z. Naturforsch. 30b, 249 [1975]) 
  Published    1975 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0249.pdf 
 Identifier    ZNB-1975-30b-0249 
 Volume    30 
63Author    M., S. W.Requires cookie*
 Title    Efficiency of Photosubstitution of Arenetricarbonylchromium(O) Complexes  
 Abstract    The quantum efficiency of the formation of (arene)Cr(CO)2(pyridine) (arene = benzene, mesitylene) is reported as a function of the irradiation wavelength of (arene)Cr(CO)3 and as a function of pyridine concentration. The quantum efficiency is independent of pyridine concentration in the range 0.008-0.17 M. The quantum efficiency is 0.72 ± 0.07 upon 313, 366, or 436 nm irradiation. The (arene)Cr(CO)3 complexes are found to quench triplet excited benzil at a diffusion controlled rate and the quenching is accompanied by reaction of the (arene)Cr(CO)3. The reaction product which presumably arises from CO release is the same as that obtained from direct irradiation of (arene)Cr(CO)3 in the presence of benzil. However, the triplet sensitized reaction occurs with a quantum efficiency of only 0.15 ± 0 .0 5 in contrast to the high substitution efficiency (0.72 ±0.07) of (arene)Cr(CO)3 upon direct irradiation. 
  Reference    (Z. Naturforsch. 30b, 254—258 [1975]; received May 10 1974) 
  Published    1975 
  Keywords    Photosubstitution, Metal Carbonyl, Energy Transfer, Photodissociation 
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 Identifier    ZNB-1975-30b-0254 
 Volume    30 
64Author    Requires cookie*
 Title    Die Analytische Bedeutung des Ortho-Effektes in der Massenspektrometrie: Untersuchungen von Benzoe-und Thiobenzoesäure-Derivaten Spectroscopic Investigations, I X 1 The A nalytical Importance of the Ortho Effect in Mass Spectrom etry: Investigations of Benzoic and Thiobenzoic Acid Derivatives  
 Abstract    J ü r g e n M a r t e n s 2, K l a u s P r a e f c k e u n d H e l m u t S c h w a r z The mass-spectrometric investigation of esters and thiolesters of benzoic, thiobenzoic, salicylic and thiosalicylic esters shows that an analytical distinction with aid of the ortho effect is only possible under certain conditions between 1,2 -disubstituted aromatic compounds and the other constitutional isomers. Absent or small intensive signals of rearrangement-ions do not exclude such a constitution. The apparent anomalous behaviour of the S-methyl, S-tolyl and O-tolyl esters is rationalized by energy considerations. The influence of the enthalpy of formation of the neutral particles on the product distribution (a-cleavage/ortho effect) is discussed. 
  Reference    (Z. Naturforsch. 30b, 259—262 [1975]; eingegangen am 22. Oktober 1974) 
  Published    1975 
  Keywords    Esters, Thiolesters, Ortho-Effect 
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 Identifier    ZNB-1975-30b-0259 
 Volume    30 
65Author    Requires cookie*
 Title    N ew Methods for Spectrophotometric Determination of pK-Values, II Titration of B ivalent Protolytes  
 Abstract    R ü d i g e r B l u m e , H e i n r i c h L a c h m a n n u n d J ü r g e n P o l s t e r Physikalisch-chemisches Institut der Universität Tübingen H errn P r o f . D r . D r . G. W e i t z e l zum The number of linear independent dissociation equilibria of spectrophotometric titra­ tion may be determined experimentally by means of absorbance diagrams and absor-bance-difference-quotient diagrams. The different types of spectrophotometric titration curves in two-step titrations are classified. By simulation of systematic error functions the limits of plv determination using turning points of two-step titration curves are demonstrated. By means of certain absorbance diagrams it is possible to determine the absorbance of pure ampholyte and to construct the absorbance triangle of all three pure components. From this triangle all concentration-vs pH-curves and the pK-values of a bivalent protolyte may be established. To avoid electrometric pH-measurements new methods are devised to calculate the difference of pK-values of bivalent protolytes. These new methods are demonstrated using as examples o-phthalic acid, 3-hydroxy-4-nitrobenzoic acid and sozoiodolic acid. 
  Reference    (Z. Naturforsch. 30b, 263—276 [1975]; eingegangen am 31. Oktober 1974) 
  Published    1975 
  Keywords    Spectrophotometric Titration, Absorbance Diagrams, Absorbance triangle, pK-Values, pK-Differences 
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 Identifier    ZNB-1975-30b-0263 
 Volume    30 
66Author    Requires cookie*
 Title    The Crystal Structure of SrPb03  
 Abstract    H a n s -L . K e l l e r , K a r l -H . M e i e r u n d H k . M ü l l e r -B u s c h b a u m Preparation, High Oxygen Pressure, X-ray Single crystals of SrPb03 could be prepared by oxygen-high-pressure-synthesis (P02 > 3500 at, £ = 450 °C). Single crystal X-ray diffraction data confirm the space group D^-Pnma. SrPb03 belongs to the ortho-rhombic distorted Perowskit type with a = 5.964, b = 8.320, c = 5.860 Ä. The atomic positions were refined. 
  Reference    (Z. Naturforsch. 30b, 277—278 [1975]; eingegangen am 12. Dezember 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0277_n 
 Volume    30 
67Author    Requires cookie*
 Title    D i e c -L a  
 Abstract    n g W a g n e r , H a r t m t j t W a g n e r und O s k a r G l e m s e r NS-ring-system, 19F NMR, X H NMR By reaction of silver-3,5-difluoro-l,1,3,5-tetraoxo-1,3,5,2 ,4,6-trithiatriazene (1,3,5-SVI) with alkyljodids a new inorganic ring-system is formed, containing two sulfanuric-fluoride -groups and one alkylsulphimide-group. The structures are proofed by NMR and other structure-isomeres can be excluded. 
  Reference    (Z. Naturforsch. 30b, 279 [1975]; eingegangen am 2. Dezember 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0279_n 
 Volume    30 
68Author    G. B.Requires cookie*
 Title    Internal Vibrations o f the Antim onate Octahedron in Ordered Perovskites  
 Abstract    Vibrational Spectra, Antimonates The infrared and Raman spectra of the perovskites SrLaMgSb06 and Ba4LiSb30 12 are reported and discussed in terms of anti-monate internal modes. 
  Reference    (Z. Naturforsch. 30b, 280 [1975]; received October 16/November 25/ December 16 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0280_n 
 Volume    30 
69Author    Requires cookie*
 Title    Determination of SS Bond Distances from Vibrational Spectra  
 Abstract    Linear relationships have been established between SS bond distances and both SS force constants and SS stretching frequencies. Bond distances are derived for S2-, S3~, and S42+. 
  Reference    (Z. Naturforsch. 30b, 281—282 [1975]; eingegangen am 4. November 1974) 
  Published    1975 
  Keywords    SS Bond Distances, SS Force Constants, SS Stretching Frequencies, Sulphur Compounds 
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 Identifier    ZNB-1975-30b-0281_n 
 Volume    30 
70Author    F. H., W. P.Requires cookie*
 Title    Hexa(isocyanato)disilane  
 Abstract    The new compound hexa(isothiocyanato)-disilane, Si2(NCO)6, is prepared by reaction of Si2Br6 and AgNCO in toluene, and is charac­ terized by mass, vibrational as well as UV spectra. 
  Reference    (Z. Naturforsch. 30b, 282—283 [1975]; eingegangen am 2. Januar 1975) 
  Published    1975 
  Keywords    Hexa(isocyanato)disilane, Vibrational Spectra, Mass Spectra, UV Spectra 
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 Identifier    ZNB-1975-30b-0282_n 
 Volume    30 
71Author    Universität MainzRequires cookie*
 Title    Pyridine-2-thiolato Complexes of Copper(I) and Cobalt(III)  
 Abstract    Pyridine-2-thiolato-copper(I), Triphenylphosphine-pyridine-2-thiolato-copper(I), Tris(pyridine-2-thiolato)cobalt(III), Preparation, Mass Spectra Pyridine-2-thiolato complexes of copper(I) and cobalt(III) have been prepared from copper(II)-and cobalt(III)-acetylacetonate with pyridine-2 -thiol as well as by reacting CuCl(pyridine-2-thiol)3 and CoCl2-(pyridine-2-thiol)2 with a base. The copper(I) complex forms an addition product of low stability with triphenylphosphine. The cobalt complex is monomeric whereas according to its mass spectrum pyridine-2-thiolato-copper(I) ap­ pears to be tetrameric. 
  Reference    (Z. Naturforsch. 30b, 284—285 [1975]; eingegangen am 25. November 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0284_n 
 Volume    30 
72Author    W. G.Requires cookie*
 Title      
 Abstract    Amid-trichloroboranes, 35C1 NQR spectra The 35C1 NQR spectrum od dimethyl -carbamoylchloride-trichloroborane shows an extraordinarily high shift of the C-Cl reso­ nance compared to the uncomplexed di-methyl-carbamoylchloride. The reasons are discussed. 
  Reference    (Z. Naturforsch. 30b, 286—287 [1975]; eingegangen am 9. Dezember 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0286_n 
 Volume    30 
73Author    R.N GRequires cookie*
 Title    Specific Acid Catalyzed Deuteration o f the Acetyl Groups o f 2,4-Diacetyldeuterohemin-OM e  
 Abstract    O s k a r O s t e r , G e o r g e W. N e i r e i t e r , a n d F r a n Deuteration, 2,4-Diacetyldeuterohemin-OMe The methyl group of the acetyl groups in 2,4-diacetyldeuterohemin-OMe has been selectively deuterated. After removal of the iron, D 6-2,4-diacetyl-deuteroporphyrin-OMe can be reduced to the corresponding hemato-porphyrin and subsequent dehydration gives deuterated vinylic groups for protoporphyrin IX-OMe. 
  Reference    (Z. Naturforsch. 30b, 288—289 [1975]; received October 30 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0288_n 
 Volume    30 
74Author    J. R., D. B., F. K.Requires cookie*
 Title    High Pressure Reactions, IX 1 Isomerizations at High Pressures  
 Abstract    Cyclooctatetraene dimerises at high pres­ sure (12 Kbar, 20 °C) to the isomers 2 and 3. At 120 °C compound 2 isomerises quanti­ tatively to compound 3. The conversion rate of Hexamethyldewarbenzene to Hexamethyl-benzene at high pressures depends on kind of solvent, whereas the influence of tempera­ ture is small in the range between 2 0 ° and ' 80 °C. 
  Reference    (Z. Naturforsch. 30b, 290 [1975]; eingegangen am 17. Oktober 1974) 
  Published    1975 
  Keywords    High Pressure, Cyclooctatetraene, Dimerisation, Hexamethyldewarbenzene, Isomerization 
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 Identifier    ZNB-1975-30b-0290_n 
 Volume    30 
75Author    E., A. K.Requires cookie*
 Title    I n g r i d F i s c h l e r  
 Abstract    Aromatic Ligand, Photochemistry, Iron The photoreaction of [(jy-phenyl)phenyl-ethylphosphane] (rj-2,3 -dimethylbutadiene) -iron(0) with 2,3-dimethylbutadiene results in replacement of the arene ligand by the diene, leading to a bis(diene)phosphane iron(0) complex. 
  Reference    (Z. Naturforsch. 30b, 291 [1975]; eingegangen am 13.November 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0291_n 
 Volume    30 
76Author    K., J.Requires cookie*
 Title    Activated Carboxylic Acid Thioesters, I I 1 Condensation Reactions of Thionooxalate with Bifunctional Amines  
 Abstract    Dialkylmonothionooxalate, 3-Alkoxy-2-oxo-quinoxaline, Benzothiazole-2-carboxylic Acid Ethyl Ester, IR Spectra, Tautomerism Reaction of dialkyl monothionooxalate with ortho -phenylenediamine yields 3 -alkoxy -2 -oxo-quinoxaline, whereas benzothiazole-2-carboxylic acid ethyl ester 8 is obtained from o-aminothiophenole. 
  Reference    (Z. Naturforsch. 30b, 292—293 [1975]; eingegangen am 21. November 1974) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0292_n 
 Volume    30 
77Author    Requires cookie*
 Title    Über die Umsetzung von Alkylaziden m it Nitrosylchlorid und Antim on(V)-chlorid  
 Abstract    The Reaction of Alkyl Azides w ith Nitrosyl Chloride and Antimony(V) Chloride P e t e r V o l g n a n d t 1 und A rm in Schmidt Azide Reactions, Nitrosyl Chloride, Antimony(V) Chloride Methyl azide reacts with nitrosyl hexachloroantimonate(V) according to the conditions to yield nitrogen, dinitrogen oxide and methyl chloride or N-methylmethylenimonium hexachloroantimonate(V) (1). Independant of the conditions ethyl or isopropyl azide give 1 :1-compounds of the azides with antimony(V) chloride and ethylidene or iso-propylideneimonium hexachloroantimonate(V) (2) or (3). 
  Reference    (Z. Naturforsch. 30b, 295—298 [1975]; eingegangen am 29. November 1974/20. Januar 1975) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0295 
 Volume    30 
78Author    Requires cookie*
 Title    Neue Verfahren zur Darstellung von Chromaten und Polychromaten New Methods for the Preparation of Chromates and Polychrom ates  
 Abstract    W e r n e r J . B e h r 1 und J o a c h i m F u c h s In stitu t für Anorganische Chemie der F reien U n iversität Berlin Chromates, Preparation, H ydrolysis, P olychrom ates Chromates and p olychrom ates w ith organic cations can be obtained b y careful h yd ro­ lysis o f m ono-, di-or trichrom ate esters in the presence o f organic bases. M ixtures of nitrobenzene and carbon tetrachloride are used as solven ts. W hen nitrobenzene soluble chrom ates are reacted w ith chrom ate esters more condensed anions such as tri-and tetrachrom ates are form ed. As tetra-n -b u tylam m on iu m salt [(C4H 9)4N ]2Cr3O10 for the first tim e a trichrom ate was obtained th a t can be recrystallized undecom posed from w ater. 
  Reference    (Z. Naturforsch. 30b, 299—304 [1975]; eingegangen am 14. November 1974/6. Februar 1975) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0299 
 Volume    30 
79Author    Requires cookie*
 Title    Die Kristallstruktur von KT1F4  
 Abstract    In stitu t für Anorganische und A nalytische Chemie der JL -U n iversität Gießen Crystal Structure, P otassium tetrafluorothallate T he results o f X -ray structure determ inations on single crystals o f KT1F4 are reported. T he u nit cell is trigonal with a = 8.025, c = 1 0 .1 6 Ä , Z = 6 ; space group: P 3 X — C|. K T1F4 is a new superstructure variant o f th e CaF2-type. E ach T1 is coordinated b y 7, K by 8 resp. 9 F. Other A + B 3 + F 4-type com pounds (A+ = N a, Ag, K ; B 3+ — In, Tl, Ln) are isostructural w ith KT1F4. 
  Reference    (Z. Naturforsch. 30b, 305—312 [1975]; eingegangen am 10. Februar 1975) 
  Published    1975 
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 Identifier    ZNB-1975-30b-0305 
 Volume    30 
80Author    Requires cookie*
 Title    LiuGe6 -eine Phase m it isolierten, ebenen Ge-Fünfringen Liu Ge6 -a Phase with Isolated, Plane, Five-Membered Ge-Rings  
 Abstract    U r s u l a F r a n k u n d W i k i n g M ü l l e r Abteilung I I für A norganische Chemie, E d u ard -Z in tl-In stitu t der Technischen H ochschule D arm stadt Interm etallic C om pound, L ithium Germ anide A new lithium germ anide L in G e6 has been found and its crystal structure has been determ ined. I t crystallizes orthorhom bic, a = 4.38 i 0.01 Ä , b = 24.55 i 0.05 A, 
  Reference    (Z. Naturforsch. 30b, 313—315 [1975]; eingegangen am 4. Februar 1975) 
  Published    1975 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0313.pdf 
 Identifier    ZNB-1975-30b-0313 
 Volume    30 
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