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1Author    Sn Bakalova, P. Nikolov, E. Stanoeva, V. Ognyanov, M. HaimovaRequires cookie*
 Title    Luminescence Properties and Electronic Structure of Some Quinolizinone and Indolizinone Derivatives  
 Abstract    The absorption and luminescence static and dynamic properties of a group of quinolizinone and indolizinone derivatives in solvents of different polarity at 297 K and 77 K are studied. On the basis of the spectral data and the PPP quantum-chemical results the problem of the main chromophore in these structures is discussed. 
  Reference    Z. Naturforsch. 47a, 521—526 (1992); received October 29 1991 
  Published    1992 
  Keywords    Absorption, Luminescence, Quinolizinones, Indolizinones 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0521.pdf 
 Identifier    ZNA-1992-47a-0521 
 Volume    47 
2Author    M. Brozis3, J. R. Heldtb, J. Heldt3Requires cookie*
 Title    Experimental and Theoretical Determination of Electronic State Energies of Naphthanilides  
 Abstract    Experimental absorption spectra of a -and /3-naphthanilide derivatives in the vapour phase and in MCH solution are interpreted on basis o f calculations performed using the INDO/S-CI method. The ground state geometries have been optimised with the PM3 parameterisation method. The calculated values of the lowest triplet state T { as well as energy differences of the Tj —► Tn transitions have been compared with measured data determined from the phosphorescence and picosecond transient absorption spectra. For SQ —► Sn and T x — Tn transitions, a good agreement is noticed between the experimental and calculated energy values. An additional band observed in the total luminescence spectrum at 77 K, is interpreted as due to the emission of the double H-bonded imidol dimer formed in the excited state. -PACS: 31.70 Dk, 33.50 Dg 
  Reference    Z. Naturforsch. 56a, 841—848 (2001); received August 27 2001 
  Published    2001 
  Keywords    Naphthanilides, Absorption, INDO/S Calculations, Luminescence Spectrum 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0841.pdf 
 Identifier    ZNA-2001-56a-0841 
 Volume    56 
3Author    B. Moeseleb, D. Horvath, Lindenau, H. L. KraussRequires cookie*
 Abstract    Oxygen The oxygen partial pressure above sup-ported, coordinatively unsaturated Cr 11 , V 111 , Mo 11 and Mn 11 species was measured with a Zr02 cell. Within this series the pressure ranges from 10~ 6 to 10 -11 ppm 02, with the Mn n /Si02 systems exhibiting the lowest values of 10~ 10 -8 and 10" 11 -3 . Other pertinent properties like chemiluminescence with 02 and catalytic activity in ethylene polymerisa-tion are also indicated. The manganese(II) absorption masses are thus particularly suitable for removal of traces of oxygen from liquids and gases in general but especially from polymerizable olefins. 
  Reference    (Z. Naturforsch. 31b, 892—893 [1976]; eingegangen am 12. März 1976) 
  Published    1976 
  Keywords    Absorption, Surface Compounds, Transition Metals, Coordinative Unsaturation, Supports 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0892_n.pdf 
 Identifier    ZNB-1976-31b-0892_n 
 Volume    31 
4Author    H. C. Heinrich, J. Brüggemann, E. E. Gabbe, M. Gläser, Fatima Icagic, Ellen PapeRequires cookie*
 Abstract    Iron A high correlation coefficient r = —0.832 (Pr * o< 0.0001) was estimated in man for the inverse relationship between the diagnostic 59Fe2+-absorption and the serum ferritin con­ centration which is very close to the correlation r = — 0.88 as described for the relationship between the diagnostic 59Fe2+-absorption and the diffuse cytoplasmic storage iron in the bone marrow macrophages. The increase of the diagnostic 59Fe2+-absorption seems to be an earlier and more sensitive indicator of depleted iron stores whereas the serum ferritin decreases somewhat later during the development of iron deficiency. 
  Reference    (Z. Naturforsch. 32c, 1023 [1977]; received July 29 1977) 
  Published    1977 
  Keywords    Absorption, Serum Ferritin, Iron Stores, Iron Deficiency 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-1023_n.pdf 
 Identifier    ZNC-1977-32c-1023_n 
 Volume    32 
5Author    I. Timtcheva, P. Nikolov, St Minchevand, N. SofronievRequires cookie*
 Title    Luminescence Properties of Some 4-or 5-Aminosubstituted Indan-13-Diones  
 Abstract    The photophysical characteristics of some 4(5)-amino-2-aryl-and 4(5)-amino-2-aryl-2-carboxy-methyl-l,3-indandiones have been studied in solvents of different polarity at room temperature and at 77 °K. In contrast to the 2-arylindan-l,3-diones unsubstituted in the phthaloyl fragment, the compounds investigated are photostable and fluoresce in the region 25 000-18 000 cm -1 with fluorescence quantum yields between 0.1 and 0.5. 
  Reference    Z. Naturforsch. 42a, 289—292 (1987); received October 22 1986 
  Published    1987 
  Keywords    4-and 5-amino indan-l, 3-diones, absorption, fluorescence, phosphorescence 
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 TEI-XML for    default:Reihe_A/42/ZNA-1987-42a-0289.pdf 
 Identifier    ZNA-1987-42a-0289 
 Volume    42 
6Author    Józef Heldt, JaninaR. Heldt, Jerzy KamińskiRequires cookie*
 Title    Steady-state and Time-resolved Spectroscopic Studies of Benzanilides  
 Abstract    Steady-state and time-resolved spectroscopic studies of benzanilide (I) and jV-methylbenzanilide (II) were performed at 298 and 77 K in various solvents. The results indicate that benzanilide fluorescence in non-polar solvents at room temperature involves three independent modes of emission: F! (LE) nor-mal fluorescence from the initially excited state Sj (LE) with ^^=320 nm, F^PT) fluorescence from the proton transfer tautomer with ^^=468 nm, F^CT) fluorescence from the species where intramo-lecular charge transfer appears, with ^^=510 nm. At 77 K in MCH a new fluorescence band, F ag , appears at Am ax = 4 15 nm instead of the F 2 (PT) and F^CT) fluorescence. This new emission originates from benzanilide dipolar aggregates or cis-imidol dimers. The decay times of these emission modes are different. yV-methylbenzanilide, dissolved in nonpopular and weakly polar solvents at room temperature and at 77 K, shows only two fluorescence modes, i.e., the normal and the charge-transfer emissions at 320 nm and 520 nm, respectively. The fluorescence is deactivated with two decay times, 30 ps and 2.05 ns, in MCH solution. 
  Reference    Z. Naturforsch. 54a, 495—502 (1999); received May 18 1999 
  Published    1999 
  Keywords    Benzanilides, Absorption, Emission and Picosecond Transient Absorption Spectra, Fluo-rescence Decay Times 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0495.pdf 
 Identifier    ZNA-1999-54a-0495 
 Volume    54 
7Author    T. Hom As Brandlm, Hugo Scheer, W. Olfhart RüdigerRequires cookie*
 Title    Chromophore Content and Molar Absorptivity of Phytochrome in the Pr Form  
 Abstract    Quantitative absorption spectra in the visible and UV region were recorded for denaturated phytochrome (P r) and phytochromobilin peptides in comparison with native Pr. The method was tested with C-phycocyanin from Spirulina platensis. Based on known molar absorptivities for denaturated phycocyanin and suitable model compounds, and on the ratio ^niüve/^delrS = 2.9, ^native was determined to be 1 0 2 0 0 0 m _1 cm-1 for one phycocyanobilin chromophore in native phycocyanin. Likewise, N a t iv e was calculated to be 19000 M -1 cm-1. The corresponding ratios for Pr Were ^native/^denatured = 3*4 and A native/-^degraded = 3.7, t h l S yielded ^native = 109000 tO 118000 and eSUfcve = 36000 M _1 cm-1 for phytochromobilin in native P r. This value corresponds to one phytochromobilin per small phytochrome (60000 D) if data from the literature are corrected for the content o f colorless proteins. The latter has been asessed from (i) the purity index (A2g0/A665) and (ii) the contribution o f the phytochromobilin chromophore at 280 nm as derived from model compounds. 
  Reference    Z. Naturforsch. 36c, 431 (1981); received February 20 1981 
  Published    1981 
  Keywords    Absorption, Spectroscopy, A-Dihydrobilindiones, Isophorcabilin, Phycobiliproteins, Phytochrome, Phytochromobilin-Peptides 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0431.pdf 
 Identifier    ZNC-1981-36c-0431 
 Volume    36 
8Author    I. Grabchev, I. Moneva, E. Wolarz3, D. Bauman3, S. StoyanovbRequires cookie*
 Title    Spectral Properties of 3-Benzanthrone Derivative Dyes in Isotropic Solvents, Polymer Film and Liquid Crystal  
 Abstract    Some recently synthesized benzanthrone derivatives bearing azomethine and oxy groups at C-3 po­ sition have been systematically studied. The influence of the substituents and of the environment (iso­ tropic and anisotropic media) on the absorption and fluorescence of the dyes and their vibronic transi­ tions is discussed in this paper. 
  Reference    Z. Naturforsch. 56a, 291—296 (2001); received January 24 2001 
  Published    2001 
  Keywords    3-Benzanthrone Derivatives, Azomethine and Oxy substitutes, Absorption, Fluorescence, Vibronic Structure 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0291.pdf 
 Identifier    ZNA-2001-56a-0291 
 Volume    56 
9Author    Irina Petkova, ApostolosJ. Maroulisa, Constantina Hadjiantoniou-Maroulis3, Peter NikolovRequires cookie*
 Title    Electronic Spectral Investigations upon the Photochemical Transformations of Some Substituted l-(N,N-bisacyl)amino-4,5-diphenyl-l,2,3-triazoles  
 Abstract    The objective of this report is to investigate the steady state and dynamic photophysical and photochemical properties o f l-(N,N-bisacyl)amino-4,5-diphenyl-1,2,3-triazoles in solvents o f dif­ ferent polarity at room temperature and in frozen matrix at 77 K. On the basis o f the comparison of their UV absorption and luminescence spectra with those of 4,5-diphenyl-1,2,3-triazole and diben-zamide (model compounds), cleavage o f the N-N bond in the title compounds after irradiation with polychrome UV light is proved. 
  Reference    Z. Naturforsch. 56a, 452 (2001); received May 14 2001 
  Published    2001 
  Keywords    l-(N ,N-bisacyl)am ino-1,2,3-triazoles, Absorption, Luminescence, UV Irradiation, N-N Bond Cleavage 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0452.pdf 
 Identifier    ZNA-2001-56a-0452 
 Volume    56 
10Author    Rainer Jaenicke, Hans-Dietrich Liidemann, Gerhard SchmidRequires cookie*
 Title    Pressure, Temperature and pH Dependence of the Absorption Spectrum of Reduced Nicotinamide Adenine Dinucleotide  
 Abstract    Enzymological studies at high hydrostatic pressure generally involve temperature, pH and pressure as variables, owing to the effect of adiabatic compression and the ionization volume o f the buffer system. In the case of N AD dependent oxidoreductases this implies that the extinction coefficient o f the coenzyme may be affected by p, T and pH, apart from the spectral change accompanying the redox reaction. Measurements o f the pressure dependence of the absorbance of N AD H show a slight red shift and a 1% decrease (3% increase) o f the absorbance at 339 nm (360 nm) at 2 kbar. The pH depen­ dence at the given wavelengths amounts to —(2.4 ± 0.1)% per pH unit (25 °C), while the intrinsic temperature effect (after correction for thermal expansion) is o f the order o f -0.2% per degree (2 0 -3 0 °C). Applying buffers with negligible ionization volume, 366 nm is the optimum wavelength for high pressure studies up to 2 kbar because here the pressure dependent spectral changes o f the N ADH absorption vanish. 
  Reference    Z. Naturforsch. 36c, 84—8 (1981); received October 9 1980 
  Published    1981 
  Keywords    Absorption, Dehydrogenases, High Pressure, NADH, Oxidoreductases, pH Dependence, Tem­ perature Dependence 
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 TEI-XML for    default:Reihe_C/36/ZNC-1981-36c-0084.pdf 
 Identifier    ZNC-1981-36c-0084 
 Volume    36 
11Author    IouriE. Borissevitcha+, ChristianeP F Borgesa++, GalinaP. Borissevitcha+++, VictorE. Yushmanova+, SoniaR W Louroh, Marcel TabakaRequires cookie*
 Title    Binding and Location of Dipyridamole Derivatives in Micelles: the Role of Drug Molecular Structure and Charge  
 Abstract    Binding and localization of the vasodilator and antitumor drug coactivator dipyridamole (D IP) and of its three derivatives, RA14. RA47 and RA25 (D IP D), to cationic (cetyltrimeth-ylammonium chloride), anionic (sodium dodecylsulfate), zwitterionic (N-hexadecyl-N.N-di-methyl-3-ammonio-l-propanesulfonate). and neutral (r-octylphenoxypolyethoxyethanol) m i­ celles was studied using fluorescence, optical absorption and 'H N M R spectroscopy. The analysis of N M R . optical absorption and fluorescence data indicates that the depth of local­ ization of the drugs in the micelles from the surface decreased in the order D IP > RA 14 > RA47 > RA25. The binding constants for the neutral drug forms change in the same order in the range of 1400-3100 m _1 for D IP to 80-300 m _1 for RA25. This order is identical with the reported biological activity of D IP D . For the protonated drugs in zwitterionic or neutral micelles the binding constants are reduced by a factor of 20-75. 
  Reference    Z. Naturforsch. 51c, 578—590 (1996); received March 28/May 31 1996 
  Published    1996 
  Keywords    Dipyridamole and Derivatives, Micelle, Drug Location, Absorption, Fluorescence, N M R 
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 TEI-XML for    default:Reihe_C/51/ZNC-1996-51c-0578.pdf 
 Identifier    ZNC-1996-51c-0578 
 Volume    51