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1Author    M. Böckmann, K. Taraz, H. BudzikiewiczRequires cookie*
 Title    Biogenesis of the Pyoverdin Chromophore  
 Abstract    A fter growing Pseudomonas aeruginosa in the presence of 2 ,4-[4-15N]-diaminobutyric acid (D ab) its incorporation into the quinoline chromophore of the pyoverdin produced by this bacterium could be shown by mass and NM R-spectroscopic techniques. In combination with earlier results it can thus be stated that the precursor of the chrom ophore is a condensation product of L-Dab and D-Phe or D-Tyr. A synthesis for [4 -15N ]-D ab is described. 
  Reference    Z. Naturforsch. 52c, 319 (1997); received April 17 1997 
  Published    1997 
  Keywords    Pseudomonas, Siderophores, Pyoverdin, Biogenesis, l:, N-Labelling 
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 TEI-XML for    default:Reihe_C/52/ZNC-1997-52c-0319.pdf 
 Identifier    ZNC-1997-52c-0319 
 Volume    52 
2Author    Gernot Heckmann, Ekkehard Fluck, Peter KuhmRequires cookie*
 Title    A [l,3,4]Thiazaphospholidine, Preparation and NMR Data  
 Abstract    Preparation and properties of a [l,3,4]thiaza-phospholidine are described. The 31 P. 13 C and 'H NMR spectra in double and triple resonance mode are recorded and discussed in detail. 
  Reference    (Z. Naturforsch. 42b, 115—117 [1987]; eingegangen am 29. August 1986) 
  Published    1987 
  Keywords    [l, 3, 4]Thiazaphospholidine, NMR Spectra, Triple Resonance 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0115_n.pdf 
 Identifier    ZNB-1987-42b-0115_n 
 Volume    42 
3Author    Ekkehard Fluck, Peter Kuhm, Heinz RiffelRequires cookie*
 Title    [l,4,2]Diazaphospholidine [l,4,2]Diazaphospholidines  
 Abstract    Bis(diethylamino)phosphanylacetylen reacts with N.N'-dimethyl thiourea to give 2-diethyl-amino-l,4-dimethyl-3-methylene-[l,4,2]diazaphospholidine-5-thion (2) besides the [1.3.4]thi-azaphospholidine (1). The latter compound is converted into 2 by heating. Reaction of 2 with various reagents yields other members of the title compound class. All new compounds are characterized by some reactions and their NMR and IR spectra. In addition, the results of an X-ray structure analysis of 2-diethylamino-l ,4-dimethyl-3-methylene-2-thioxo-[l ,4.2]diazaphos-pholidine-5-thion (5) are reported. 
  Reference    Z. Naturforsch. 43b, 1481—1489 (1988); eingegangen am 17. Mai 1988 
  Published    1988 
  Keywords    [l, 4, 2]Diazaphospholidines, NMR Spectra, Crystal Structure 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1481.pdf 
 Identifier    ZNB-1988-43b-1481 
 Volume    43 
4Author    Jochen Eilermann, Horst Schössner, HelmutA. LindnerRequires cookie*
 Title    Chemie polyfunktioneller Liganden  
 Abstract    , XLIV [1] Darstellung und Eigenschaften von l.l.l-Tris(diiodarsinomethyl)ethan Chemistry of Polyfunctional Ligands, XLIV [1] Preparation and Characterization of l,l,l-Tris(diiodarsinomethyl)ethane 
  Reference    Z. Naturforsch. 33b, 603—605 (1978); eingegangen am 23. März 1978 
  Published    1978 
  Keywords    l, l, l-Tris(diiodarsinomethyl)ethane, Raman, IR, FIR, *H NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0603.pdf 
 Identifier    ZNB-1978-33b-0603 
 Volume    33 
5Author    Ernst Luppold, Eugen Müller, Werner WinterRequires cookie*
 Title    Ring-opening of 2,5-Diphenyl-tellurophene with n-Butyl-Lithium Synthesis of 1,4-substituted Butadiene Derivatives  
  Reference    (Z. Naturforsch. 31b, 1654—1657 [1976]; eingegangen am 26. Juli 1976) 
  Published    1976 
  Keywords    ) l, 4-Diphenyl-l, 3-butadiene, 2, 5-Diphenyl-2, 4-hexadiene, 2, 5-Diphenyl-2, 4-hexadiendial, 2, 5-Diphenyl-muconic Acid, l, 2, 5, 6-Tetraphenyl-2, 4-hexadiene-l, 6-dion 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1654.pdf 
 Identifier    ZNB-1976-31b-1654 
 Volume    31 
6Author    Helmut Wombacher, Monika Reuter-SmerdkaRequires cookie*
 Title    Spectrometric and Biological Data of l,N 6-Ethenoadenosine 3',5'-Cyclic Monophosphate  
  Reference    (Z. Naturforsch. 31c, 18 [1976]; received July 12/September 25 1975) 
  Published    1976 
  Keywords    ) l, N 6-Ethenoadenosine 3', 5'-Cyclic Monophosphate, Fluorescence, Spectra, Protein Kinase 
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 TEI-XML for    default:Reihe_C/31/ZNC-1976-31c-0018.pdf 
 Identifier    ZNC-1976-31c-0018 
 Volume    31 
7Author    FredR. Oschea, G. Ernot, H. Eckm, Anna, FrankW. Ellerb, Ekkehard Fluck0Requires cookie*
 Title    Ein neuer Heterocyclus  
 Abstract    , 2A3,4A5-[l,2,4]-O xadiphosphinin (2), als Ligand eines zw eikernigen Eisenkom plexes A New H eterocycle, 2A3,4A5-[l,2,4]-O xadiphosphinine (2), as L igand o f a Binuclear Iron C om plex Preparation and properties of a coordination compound are described, in which a carbonyl group in bis[(dicarbonyl)(/;;i-cyclopentadienyl)iron] is substituted by hitherto unknown octa-Af-methyl-2A',4A:i-[l,2,4]-oxadiphosphinine-2,4,4,6-tetramine (2). The 'H , '1P, and l3C NMR spectra are recorded and discussed in detail. The molecular structure of the iron complex 4 is described and interpreted. 
  Reference    Z. Naturforsch. 51b, 1725—1731 (1996); eingegangen am 27. Juni 1996 
  Published    1996 
  Keywords    [l, 2, 4]-Oxadiphosphinine, Binuclear Iron Complex, NMR Spectra, X-Ray 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1725.pdf 
 Identifier    ZNB-1996-51b-1725 
 Volume    51 
8Author    Gerd-Volker RöschenthalerRequires cookie*
 Title    The Insertion of Hexafluoroacetone into P-H Bonds of Phosphanes MenPH3_n  
  Reference    Z. Naturforsch. 33b, 311—315 (1978); eingegangen am 12. Dezember 1977/19. Januar 1978 
  Published    1978 
  Keywords    2-Hydroxy-l, l, l, 3, 3, 3-hexafluoroisopropyl-phosphanes, Hexafluoroacetone, Bis( 1, 1, 1, 3, 3, 3-hexafluoroisopropoxy )dimethylfluorophosphorane 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0311.pdf 
 Identifier    ZNB-1978-33b-0311 
 Volume    33 
9Author    Manfred Weide, Helge Pesel, ++, Dang Van, Hieu ++Requires cookie*
 Title    mit starken intramolekularen sterischen Wechselwirkungen, IX [1] terf-Butylsubstituierte Di-und Trisiloxane Silicon Compounds with Strong Intramolecular Steric Interactions, IX [1] tert-Butyl Substituted Di-and Trisiloxane s  
  Reference    (Z. Naturforsch. 35b, 31—34 [1980]; eingegangen am 23. August 1979) 
  Published    1980 
  Keywords    l, l, 3, 3-Tetra-£er£-butyldisiloxane-l, 3-diol, Penta-fer£-butyldisiloxanol, Steric Hindrance, Mass Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0031.pdf 
 Identifier    ZNB-1980-35b-0031 
 Volume    35 
10Author    Norbert Auner, Carola Wagner, Wolfgang ZieheRequires cookie*
 Title    Silaheterocyclen, XXVII. Substituenteneffekte zur Steuerung des Cycloadditionsverhaltens von Silaethenen [1] Silaheterocycles, XXVII. Controlling the Cycloaddition Behavior of Silenes by Substituent Effects [1]  
 Abstract    The silene Cl2Si=C(Ph)CH2Bu' (2) is formed by the reaction o f l,l,l-trichloro-2-phenyl-l-silaprop-2-ene (1) with LiBu' in n-pentane in the temperature range from -1 5 to 0 °C. TTie reaction initially leads to the corresponding a-lithio adduct A (addition o f LiBu' to the vinyl group of 1); subsequent LiCl elimination yields 2 as an intermediate. 2 can be trapped by Me3SiOMe (3) and dienes which add across the Si=C bond. In the absence of trapping agents but in the presence of the Lewis base N E t3 the mixture 1/LiBu' reacts to give the disilacyclobutane 4. Due to its electronic and steric properties, Cl2Si=C(Ph)C H 2Bu' (2) and butadienes yield mainly the D iels-A lder adducts (5, 7, 9) while with styrene and 1,3-cyclo-hexadiene the [2 + 2] and [4 + 2] products are formed in competition. With 2-norbornene, 2,5-norbornadiene and quadricyclan the [2 + 2] and [2 + 2 + 2] products are formed selectively but only in low yields. In all reactions except with quadricyclan an ene-reaction com petes with the cycloaddition leading to ene-com pounds as by-products. 
  Reference    Z. Naturforsch. 49b, 831 (1994); eingegangen am 18. Februar 1994 
  Published    1994 
  Keywords    Silaheterocycles, l, l, l-Trichloro-2-phenyl-l-silaprop-2-ene, Substituent Effects, Formation of Silenes, Cycloaddition Reactions 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0831.pdf 
 Identifier    ZNB-1994-49b-0831 
 Volume    49 
11Author    U. '. Tifat, R. Lyatifov, StanislavP. Solodovnikov, ValeryN. Babin, RosaB. MaterikovaRequires cookie*
 Title    Salts of Ferricinium Cation and its Homologues: NMR Investigation, I On Mechanisms of Spin Derealization in Salts of Ferricinium and l,l'-Dimethylferricinium Cation  
 Abstract    X H and 13 C 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 jz-contribution is the dominating one. 
  Reference    Z. Naturforsch. 34b, 863—866 (1979); received October 10 1978/January 23 1979 
  Published    1979 
  Keywords    Ferricinium, l, l'-Dimethylferricinium, Spin Derealization, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0863.pdf 
 Identifier    ZNB-1979-34b-0863 
 Volume    34 
12Author    Gerhard Himbert, Oliver GerulatRequires cookie*
 Title    Einige Umsetzungen von Inhydrazinen mit Isocyanaten: [2+2]-und [4+2]Cycloadditionen, (Hydrazinoethinyl)metallierung Some Reactions of Ynehydrazines with Isocyanates: [2+2]-and [4+2]Cycloadditions, (Hydrazinoethynyl)metallation  
 Abstract    The (silylethynyl)-and the (tolylethinyl)-hydrazines la and lb react with aryl isocyanates 2 a -e and arylsulfonyl isocyanates 2f,g to form the corresponding substituted 3-arylimino-(or arylsulfonylimino-) l,l,2-trimethyl-5-oxopyrazolidinium-4-ides 3a-h. The silyl group in the 4-position can be replaced by a hydrogen atom (formation of 6a-e). Heating of 6d in toluene induced the unequivocal transformation of the betaine to an isomer, the spectrocopic data of which are in concordance with those of the 4-quinolone derivative 7. Aroyl isocyanates 8 react in a [4+2]cycloaddition with la to furnish the l,3-oxazin-4-ones 9a and b. The stannyla-ted ynehydrazine lc adds the cumulenic system of an aryl isocyanate (2d) across the Csp-Sn single bond, and trimethylstannyl ./V-(p-chlorophenyl)-3-(trimethylhydrazino)propiolimidate 10 is isolated. With two molecules of 2d the hydantoin derivative 11 is formed. 
  Reference    Z. Naturforsch. 56b, 1196—1204 (2001); eingegangen am 2. August 2001 
  Published    2001 
  Keywords    Cycloadditions, Cyclic Betaines, l, 3-Oxazin-4-ones 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-1196.pdf 
 Identifier    ZNB-2001-56b-1196 
 Volume    56 
13Author    Requires cookie*
 Title    Investigations of Quaternary Pyridinium -Salts, V I 1 Reactions of Quaternated Pyridines w ith the Trichloromethylanion  
 Abstract    The method to generate the trichloromethylanion from chloroform and bariumliydroxide was used to prepare some substituted trichlorom ethyl-l,2-dihydropyridines and trichloro-azabicyclo[4,1,0]heptenes. 
  Reference    (Z. Naturforsch. 32b, 193—199 [1977]; eingegangen am 4. Oktober 1976) 
  Published    1977 
  Keywords    Pyridinium-Salts, Insertion Reaction, Azabicyclo[4, l, 0]heptene 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0193.pdf 
 Identifier    ZNB-1977-32b-0193 
 Volume    32 
14Author    Cornelia Lensch, Oskar GlemserRequires cookie*
 Title    Darstellung und Reaktionen von S.N-Bi8(heptafluorisopropyl)schwefelfluoridimid Preparation and Reactions of S,N-Bis(heptafluoroisopropyl)sulphurfluoride Imide  
  Reference    Z. Naturforsch. 37b, 401—403 (1982); eingegangen am 8. Dezember 1981 
  Published    1982 
  Keywords    Sulphur-amide, N-hexafluoroisopropyl, S -[2 -chlorine-1, 1, 1, 3, 3, 3 -hexafluoro]isopropyl, Sulphurfluoride-imide, N-heptafluoroisopropyl, S-[2-chlorine-l, l, l, 3, 3, 3-hexafluoro]isopropyl, Sulphur-imide, N-heptafluoroisopropyl, S-dimethoxy 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-0401.pdf 
 Identifier    ZNB-1982-37b-0401 
 Volume    37 
15Author    Reinhold Tacke, Hartwig Lange, Anke Bentlage, WilliamS. Sheldrick, Ludger ErnstRequires cookie*
 Title 2,2,5,5-Tetraorganyl-l,4-dioxa-2,5-disilacyclohexanes  
 Abstract    The 2,2,5,5-tetraorganyl-l,4-dioxa-2,5-disilacyclohexanes 2a-2c were prepared by condensation of the corresponding (hydroxymethyl)diorganylsilanes 1 a-1 c. The constitu-tion of the heterocycles was confirmed by elemental analyses, cryoscopic measurements, mass spectrometry, and NMR-spectroscopic (X H, 13 C) investigations. The molecular struc-ture of 2 b was determined by X-ray diffraction analysis. 
  Reference    Z. Naturforsch. 38b, 190—193 (1983); eingegangen am 11. Oktober 1982 
  Published    1983 
  Keywords    l, 4-Dioxa-2, 5-disila-cyclohexane Ring System, Synthesis, Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0190.pdf 
 Identifier    ZNB-1983-38b-0190 
 Volume    38 
16Author    Mathias Noltemeyer, GeorgeM. Sheldrick, Carl Habben, Anton MeilerRequires cookie*
 Title    Reaktionen von Mehrfachbindungssystemen mit dem 1.2.4-Trithia-3.5-diborolan-Ring -Eine strukturelle Richtigstellung Reactions of Multiple-Bond-Systems with the l,2,4-Trithia-3,5-diborolane Ring - A Structural Correction-Dithia-3-bora-4-azacyclopentanones-(5) and -thiones-(5), Crystal Structure  
  Reference    Z. Naturforsch. 38b, 1182—1191 (1983); eingegangen am 6. Juli 1983 
  Published    1983 
  Keywords    1, 2, 3-Dithiaboroles, 1, 3, 2-Dithiaboroles, l, 2 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1182.pdf 
 Identifier    ZNB-1983-38b-1182 
 Volume    38 
17Author    N. Orbert, K. Uhna, Michael Schulten3, Roland Boeseb, Dieter BläserbRequires cookie*
 Title    Synthese und Struktur von l,3?6,8-Tetra-terf-butylcarbazol  
 Abstract    The synthesis o f 1,3,6,8-tetra-/er/-butylcarbazole (2) by the reaction o f carbazole with tert-butyl chloride in the presence o f aluminium chloride is reported. The X-ray structures o f 2 and its diethyl ether adduct are compared. The gap formed by the ter/-butyl groups in 1,8-position has been calculated and compared with that o f the supermesithyl substituent. 
  Reference    Z. Naturforsch. 46b, 1503—1508 (1991); eingegangen am 4. April 1991 
  Published    1991 
  Keywords    l, 3, 6, 8-Tetra-?m -butylcarbazole, Synthesis, X-Ray 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-1503.pdf 
 Identifier    ZNB-1991-46b-1503 
 Volume    46 
18Author    Kristallstruktur Neuer, Kai Landskron, Wolfgang SchnickRequires cookie*
 Title    Synthese und  
 Abstract    -diphosphazenium bromide [(NH->)3PNP(NHi)3]Br, nitrate 1(NH2)3PNP(NH2)3][N03], and toluene-4-sulfonate [(NH2)3PNP(NH2)3][CH3C6H4S0 3] have been prepared by anion exchange in aqueous solution. Single crystals were obtained from acetonitrile solutions in a temperature gradient between 60 °C and room temperature. The crystal structures were determined by single crystal X-ray methods at room temperature. ([(NH2)3PNP(NH2)3]Br: P i, Z = 2, a = 596.2(1),b = 744.5(1), c = 1114.4(1) pm, a = 108.78(1), ß = 104.18(1), 7 = 90.64(1)°, R 1 = 0.048, wR2 = 0.104; [(NH2)3PNP(NH2)3][N03]: Pi, Z = 2, a = 550.9(1), b = 796.3(1), c = 1115.7(1) pm, a = 94.45(1), ß = 99.55(1), 7 = 101,53(1)°, R l = 0.033, wR2 = 0.095; [(NH2)3PNP(NH2)3][CH3C6H4S 0 3]: P2,/c, Z = 4, a = 804.1(1), b = 596.1(1), c = 3218.7(3) pm, ß = 94.59(1)°, /?1 = 0.052, wR2 = 0.136). In the solid the three salts consist of discrete [(NHi)3PNP(NH2)3]+ cations and their corresponding anions. The PN4 tetrahedra in [(NH2)3PNP(NH2j3]Br are staggered, while in [(NH2)3PNP(NH2)3][N03] the eclipsed conformation is preferred. The PN4 tetrahedra of [(NH2)3PNP(NH2)3][CH3C 6H4S 0 3] show gauche conformation. 
  Reference    Z. Naturforsch. 54b, 1363—1370 (1999); eingegangen am 13. Juli 1999 
  Published    1999 
  Keywords    3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium-Salze Synthesis and Crystal Structure of Novel l, l, l, 3, 3, 3-Hexaamino-lA5, 3A5-diphosphazenium Salts Phosphazenes, Ion Exchange, Crystal Structure 1, 1, 1, 3, 3, 3-Hexaamino-lA\3A5 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1363.pdf 
 Identifier    ZNB-1999-54b-1363 
 Volume    54 
19Author    P. Moesta, U. Seydel, B. Lindner, H. G. RisebachRequires cookie*
 Title    Detection of Glyceollin on the Cellular Level in Infected Soybean by Laser Microprobe Mass Analysis  
 Abstract    Laser microprobe mass analysis was explored as a m ethod for the detection at the cellular level of the phytoalexin glyceollin in soybean cotyledons infected with an incom patible race of Phy­ tophthora megasperma f. sp. glycinea. For LAMMA® analysis 10 |im freeze microtome sections which were freeze-dried on copper grids were used. The LAM M A spectrum of glyceollin (isomer I) shows a characteristic peak at m /e = 321 which can be attributed to M -O H +. This peak was also present in the spectra of infected regions from a cotyledon b u t was completely absent in the spec­ tra of uninfected tissue. One hundred and fifty LAM M A spectra were taken along a line per­ pendicular to the border line o f infection. A steep rise in glyceollin content toward the infected area was observed. This is the First tim e th at such highly localized glyceollin accumulation has been shown at the cellular level. The results show th at LAM M A analysis is suitable for the de­ tection of organic molecules in biological tissues w ith high lateral resolution. 
  Reference    Z. Naturforsch. 37c, 748—751 (1982); received May 19 1982 
  Published    1982 
  Keywords    Glyceollin, Phytoalexins, Soybean, Glycine m ax, L, LAM MA 
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 TEI-XML for    default:Reihe_C/37/ZNC-1982-37c-0748.pdf 
 Identifier    ZNC-1982-37c-0748 
 Volume    37 
20Author    H. Strähle, W. Seitz, H. GüstenRequires cookie*
 Title    Der Substituenteneinfluß auf die Fluoreszenz des 1.3-Diphenyl-2-pyrazolins* Substituent Effects on the Fluorescence of l,3-Diphenyl-2-pyrazoline  
 Abstract    The electronic absorption spectra, absolute fluorescence spectra and fluorescence quantum yields as well as the fluorescence decay times of nine l,3-diphenyl-2-pyrazolines substituted in the para-position of the 1-phenyl ring and of 19 substituted in the para-position of the 3-phenyl ring were measured in degassed benzene at room temperature. The fluorescence quantum yields are about 0.90 with the exception of the NO2-and J-substituted l,3-diphenyl-2-pyrazolines. The fluorescence decay time ranges from 2 to 4 nsec. The natural fluorescence lifetimes determined experimentally agree well with those calculated from the absorption spectra according to STRICKLER and BERG. A plot of the Hammett r7p-values versus the energies of the absolute fluorescence maxima of the p-substituted 1-and 3-phenyl ring of the 2-pyrazoline system shows a statistically significant linear correlation with moderate precision. The linearity between ground state substituent constants and fluorescence energies reveals that the relative importance of the inductive and the resonance effects of the substituents remains constant during the transition from the ground state to the relaxed excited singlet state. In the excited singlet state of 1,3-diphenyl-2-pyrazoline the p-substituents provide more room for a larger charge displace-ment in the intramolecular charge-transfer. The structural bands in the fluorescence spectra resulting from strong electron accepting substituents in the para-position of the 1-phenyl ring are considered as the result of the ring breathing vibration due to a local excitation of the 1-phenyl ring. 
  Reference    (Z. Naturforsch. 31b, 1248—1255 [1976]; eingegangen am 20. April 1976) 
  Published    1976 
  Keywords    Fluorescence Quantum Yield, Fluorescence Decay Time, l, 3-Diphenyl-2-pyrazolines, Hammett crp-values, Fluorescence Energies 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1248.pdf 
 Identifier    ZNB-1976-31b-1248 
 Volume    31