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  • 1
    Series available for loan
    Series available for loan
    Analytical theory and numerical experiments to the forcing of flow at isolated topographic features (1995)
    Warnemünde : Inst. für Ostseeforschung
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    Call number: ZS-000(10)
    In: Meereswissenschaftliche Berichte
    Type of Medium: Series available for loan
    Pages: 61 S.
    Series Statement: Meereswissenschaftliche Berichte 10
    Language: English
    Location: Lower compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and Reactions of an (Aryloxy)titanium(IV) Hydride (1995)
    s.l. : American Chemical Society
    Organometallics 14 (1995), S. 4601-4610 
    Details
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/om00010a026
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  • 3
    Electronic Resource
    Electronic Resource
    Gloeobacter violaceus— investigation of an unusual photosynthetic apparatus. Absence of the long wavelength emission of photosystem I in 77 K fluorescence spectra (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 94 (1995), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The deeply purple cyanobacterium Gloeobacter violaceus is subject of this investigation. It does not contain thylakoids, and the photosynthetic apparatus is located in the only membrane of the cell, the plasma membrane. Upon excitation with blue light, the 77 K fluorescence emission spectra of neither intact cells (excited with 427 nm) nor of the isolated plasma membrane (excited with 430 nm), show the expected long wavelength photosystem I emission characteristic for low energy chlorophylls. Maximal fluorescence emission was observed at 688 nm. independent on the excitation wavelength, 427 (430) nm blue light, exciting mainly chlorophyll, or 550 nm green light, exciting mainly phycoerythin. The ratio of P700 to chlorophyll was 175. O2-evolution was 160 μmol mg-1 chlorophyll h-1 in saturating white light; the compensation point was reached at 6 μmol m2 s-1 in cultures grown at 25 μmol m2 s-1. Dark O2 uptake was 50 μmol mg-1 chlorophyll h-1. During adaptation to increasing white light intensities Gloeobacter reduces the amount of phycocyanin and chlorophyll per cell and strongly increases the concentration of carotenoids relative to chlorophyll. The carotenoid concentration per cell increases with increasing light intensity. Apparently, part of the carotenoids is not located in the plasma membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1995.tb00976.x
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation and Molecular Structures of Tetrahydrofuran, Diethylene Diglycol Dimethyl Ether and 18-Crown-6 Complexes of Strontium and Barium TetrahydridoborateDedicated to Prof. Dr. Nils Wiberg on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 455-460 
    Details
    ISSN: 0009-2940
    Keywords: Strontium bis(tetrahydridoborate)-2 tetrahydrofuran, chain polymer of ; Strontium bis(tetrahydridoborate)-bis(diglyme) ; Barium bis(tetrahydridoborate)-bis(diglyme) ; Strontium bis(tetrahydridoborate)-1,4,7,13,16-hexaoxacyclooctadecane ; Metal-hydrogen-boron bridges ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The strontium and barium tetrahydridoborate complexes M(BH4)2 · 2 diglyme and M(BH4)2 · 18-crown-6 (M = Sr, Ba) have been prepared from the solvates M(BH4)2 · 2 THF by ligand displacement. 11B-NMR and IR data reveal strongly polar bonding of the BH4 groups to the metal centers, and X-ray structural analyses of the diglyme and crown ether compounds show molecular units in which the BH4 group is in contact via three H atoms with the metal center. In contrast, M(BH4)2 · 2 THF compounds are chain polymers in the solid state, and each metal center is surrounded by 2 THF molecules in trans position and four BH4- groups each of which forms bridges with two metal centers. Estimations of the effective radius for the BH4 group indicate a high polarity for the M-BH4 interaction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280504
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Structures of (Acyloxy)boranesDedicated to Prof. Dr. A. Schmidpeter on the occasion of his 65th birthday.Synthesis of Structures of (Acyloxy)boranes (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 751-762 
    Details
    ISSN: 0009-2940
    Keywords: Trifluoroacyloxy-9-borabicyclo[3.3.1]nonane ; Pivaloyloxy-9-borabicyclo[3.3.1]nonane dimer ; Bis(9-borabicyclo[3.3.1]nonyl]oxalate ; Tetrakis(9-borabicyclo[3.3.1]nonyl)-dihydroxyoxalate ; Bis(9-borabicyclo[3.3.1]nonyl)-2,2-dimethylmalonate tetramer ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 9-Borabicyclo[3.3.1]nonane (9-BBNH) reacts with monocarboxylic acids to afford 9-(acyloxy)-9-borabicyclo[3.3.1]nonanes which are dimers in the solid state as shown by X-ray crystal structures of the benzoate and pivalate. More complex reactions were observed by allowing 9-BBNH to react with dicarboxylic acids in THF or monoglyme. Thus, (9-BBN)2 oxalate 3 contains a fully delocalized oxalate unit with equal C-O and B-O bond lengths. Traces of water convert it into the tetrakis(9-BBN) oxalate 5. A rather unusual structure is veryfied by 9-BBN 2,2-dimethylmalonate 7 which according to its molecular structure is a tetramer featuring a 32-membered ring system. In contrast, reactions of oxalic acid with thexylborane leads to reduction of the acid and formation of a bicyclic dioxaborolo-dioxaborolane 10. Several intermediates were detected by 11B-NMR spectroscopy as well as in reactions of BH3 · THF or BH3 · SMe2 with oxalic acid.  -  It follows from the present study that (acyloxy)boranes derived from dicarboxylic acids are strong Lewis acids with an unexpected variety of structural features.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280803
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  • 6
    Electronic Resource
    Electronic Resource
    Contributions to the Chemistry of Boron, 231Part 230: Ref.. Synthesis and Structures of Borylated HydrazinesDedicated to Professor H. P. Fritz on the occasion of his 65th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 1187-1194 
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    ISSN: 0009-2940
    Keywords: Hydrazines ; N,N'-bis(diphenylboryl)-N,N'-dimethyl- ; N,N'-bis(diphenylboryl)-N',N'-dimethyl- ; N,N'-bis(dimethylphenylsilyl)- ; N,N'-bis(chloromesitylboryl)-N'-phenyl-N'-(trimethylsilyl)- ; 1,2,4,5,3,6-Tetrazadiborinane, 1,2,4,5-tetrakis(tert-butyldimethylsilyl)-3,6-difluoro- ; Triazadiborolidine, dihydro-, derivative ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The diboration of the diazene PhN = NSiMe3 (15) by diborane(4) derivatives provides a new synthetic route to N,N'-diborylated hydrazines. The product formed depends on the type of the diborane(4) compound. Thus, addition of dimesityldiboron dichloride to 15 in a 1:1 ratio afforded (mesCIB)PhN-N(SiMe3)(BClmes) (16) while bis(dimethyl-amino)diboron dichloride was found to react in a 1:2 ratio to give a triazadiborolidine derivative 17. In addition, it was demonstrated that in the solid state Me2N-N(BPh2)2 (8) is a derivative of a three-membered dihydroazadiboriridine C while its isomer, (Ph2B)MeN-NMe(BPh2) (7), forms no BN coordinative bond. The new 3,6-difluoro-1,2,4,5-tetraza-3,6-diborine 13 shows a twist conformation. The molecular structures of all these compounds were determined by X-ray crystal structure analysis, and the influence of the B substituent on the conformation is discussed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951281209
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  • 7
    Electronic Resource
    Electronic Resource
    Contributions to the Chemistry of Boron, 230Part 229: Ref.. Electrophilic Borylation of Metallocenes: Synthesis and Molecular Structures of 1,1′,3,3′-Tetrakis(dibromoboryl)metallocenes of the Iron TriadDedicated to Prof. Dr. Dr. h.c. Gerhard Fritz on the occasion of his 75th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 621-626 
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    ISSN: 0009-2940
    Keywords: Ferrocene, tetrakis(dibromoboryl)- ; Ruthenocene, tetrakis(dibromoboryl)- ; Osmocene, tetrakis(dibromoboryl)- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of metallocenes MCp2 (M = Fe, Ru, Os) with an excess of BBr3 at reflux temperature lead specifically to 1,1′,3,3′-tetrakis(dibromoboryl)metallocenes 3, 7, and 8 in high yield. MeBBr2 and PhBBr2 are less effective borylating agents. X-ray structural analyses of 3, 7, and 8 reveal an increasing tilt of the Br2B groups towards the metal center while retaining the trigonal-planar environment at the boron atoms. This indicates a weak metal-boron interaction of the kind found for carbon-metal interactions in ferrocenyl carbocations.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280615
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  • 8
    Electronic Resource
    Electronic Resource
    Structural Chemistry of Lithium HydrazidesDedicated to Professor Ernst Biekert on the occasion of his 70th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 105-113 
    Details
    ISSN: 0009-2940
    Keywords: Lithium N,N'-diethylhydrazide hexamer ; Dilithium N,N'-bis(trimethylsilyl)hydrazide tetramer ; [Lithium N,N-bis(trimethylsily)hydrazide]-[dilithium N,N'-bis(trimethylsilyl)hydrazide] dimer ; Dilithium N-phenyl-N-trimethylsilylhydrazide tetramer ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Deprotonation of NH protons, of four diorgano-, organo(trimethylsilyl)- and bis(trimethylsilyl)hydrazines by n-butyllithium in hexane led to the following lithium hydrazides: [Et-(Li)N-N(H)Et]6, (1)6, [Me3Si(Li)N-N(Li)SiMe3]4, (2)4, [Me3Si-(Li)N-N(Li)SiMe3 · (Me3Si)2N-N(Li)SiMe3]2 (3)2, and [Ph-(Li)N-N(Li)SiMe3]4, (4)4, respectively. The structure determination by X-ray methods at low temperature reveals butterfly-shaped Li2N2 structural monomeric units which associate through “laddering” to the observed oligomers thereby generating penta- and hexacoordinated Li centers. N-N bonds lengths of up to 1.556 Å suggest that negative charge accumulates at the nitrogen atoms of (1)6, (2)4, and (3)2. An amazing structure shows the red compound 4 where two Li ions are π-sandwiched between two phenyl groups each. The compound can be looked at as a new type of a lithium lithiate complex, Li2[Li6N8Ph4(SiMe3)4], but short N-C and N-N bonds in the Li6N8 core indicate that its negative charge is transferred to the phenyl groups.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280204
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  • 9
    Electronic Resource
    Electronic Resource
    On the Chemistry of Gallium, VPart IV: Ref.. Cyclic Compounds of Gallium and Indium with the 2,2-Dimethyl-1,3-bis-[(trimethylsilyl)amino]propane LigandDedicated to Prof. Dr. Nils Wiberg on the occasion of his 60th birthday. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 487-492 
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    ISSN: 0009-2940
    Keywords: Aminogallane ; Gallane amine adduct ; Bis(amino)gallium halide ; Lithium tetrakis(amino)gallate ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of 2,2-Dimethyl-N-lithio-1,3-bis[(trimethylsilyl)amino]propane (4a) with RGaBr2 (R = Br, Mes) allows the isolation of the cyclic monomeric amine(amino)gallanes 5 and 6. The cyclic bis(amino) gallanes 7 and 9 as well as the indium homologue 10 were obtained by reaction of gallium halides RGaCl2 (R = Cl, Mes) or InCl3 with dilithiated 4. In the case of R = Mes the product is a monomer. In addition, the tetrakis(amino)gallate 8 was isolated. Single-crystal X-ray diffraction studies confirmed the constitutions. Compound 5 has one short Ga—N single bond (184 pm) and a longer Ga—N dative bond (204 pm). Compound 7 exhibits a central asymmetrical four-membered Ga2N2 ring [d(Ga—N) = 199.4, 205.6 pm] with syn-oriented substituents. The terminal Ga—N bond length is 184.3 pm. Two nitrogen atoms bridge the lithium and gallium atom in the gallate 8 [d(Li—N) = 206 pm]. Two Li-H contacts complete the coordination sphere at the lithium atom.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280509
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  • 10
    Electronic Resource
    Electronic Resource
    1,1-Hydroborierung von Alkinen mit 6-Aza-nido-decaboranen (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 947-951 
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    ISSN: 0009-2940
    Keywords: 6-Aza-nido-decaborane ; 9-(1-Alkenyl)-6-phenyl-6-aza-nido-decaborane ; 1,1-Hydroboration of alkynes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,1-Hydroboration of Alkynes with 6-Aza-nido-decaboranes[1]Alkynes AC≡CR′ (R′ = Me, Bu, tBu, SiMe3), that contain a mobile group A, like H or SiMe3, undergo hydroboration by 6-aza-nido-decaboranes RNB9H11 (1a-c, R = H, Ph, PhCH2) and 1,2-migration of the group A, to give the corresponding 9-(1-alkenyl)-6-aza-nido-decaboranes RNB9H10(CH=CR′A) (2a-h). Ethenes AHC=CH2 (A = SiMe3, SnBu3) are hydroborated by 1a, b as well to form products of the type RNB9H10(CH2CH2A) (3a-c). The alkyne Me3SiC=CH undergoes a hydroboration with 1b twice; the formation of (PhNB9H10)2CHCH2SiMe3 (4) proceeds by a 1,1- and a 1,2-hydroboration step, apparently. The crystal structure analysis of (PhCH2)NB9H10[CH=CMe(SiMe3)] (2e; space group Pl) reveals a (Z configuration of the ethene moiety.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280916
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