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  • Wiley-Blackwell  (21)
  • Institute of Physics  (13)
  • American Chemical Society (ACS)
  • 1995-1999  (22)
  • 1970-1974  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Pyrazolato- und Tetrazolato-carbonylmetallate(0) von Chrom, Molybdän und Wolfram (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3203-3208 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pyrazolato and Tetrazolato Metal Carbonyl Complexes of Chromium(0), Molybdenum(0) and Tungsten(0)Reaction of sodium pyrazolate with the hexacarbonyls of molybdenum and tungsten affords dimeric, pyrazolate bridged tetracarbonyl complexes [(CO)4ML2M(CO)4]2-. 5-Substituted tetrazolate ions however are monodentate ligands yielding monomeric anionic pentacarbonyl metalates [M(CO)5L]-. The i. r. and n. m. r. spectra are discussed.
    Notes: Natriumpyrazolat reagiert mit den Hexacarbonylen von Molybdän und Wolfram unter Bildung dimerer Tetracarbonylmetallat(0)-Komplexe [(CO)4ML2M(CO)4]2- mit Pyrazolato-brücken. 5-Substituierte Tetrazolylanionen treten dagegen als einzähnige Liganden auf; sie setzen sich mit den Metallhexacarbonylen thermisch zu einkernigen Pentacarbonylmetallaten(0), [M(CO)5L]-, um.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721051008
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  • 2
    Electronic Resource
    Electronic Resource
    Pentacarbonyl(organometallsulfid)chrom-, -molybdän- und -wolfram-Komplexe (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 48-55 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pentacarbonyl(organometal sulfide)chromium, -molybdenum, and -tungsten ComplexesThe reaction of hexacarbonylchromium, hexacarbonylmolybdenum, or hexacarbonyltungsten with di-tert-butyl sulfide, bis(trimethylgermyl) sulfide, bis(trimethylstannyl) sulfide, or bis(trimethylplumbyl) sulfide results in the elimination of one CO ligand under formation of the corresponding pentacarbonyl(organometal sulfide)chromium(O), -molybdenum(O), or -tungsten(O) complexes Their, Raman, and 1H n m. r. spectra are discussed
    Notes: Hexacarbonylchrom, -molybdän und -wolfram reagieren mit Di-tert-butylsulfid, Bis(trimethylgermyl)sulfid, Bis(trimethylstannyl)sulfid und Bis(trimethylplumbyl)sulfid unter Abspaltung cines CO-Liganden und Bildung entsprechender Pentacarbonyl(organometallsulfid)chrom(O)-, -molybdän(O)- bzw -wolfram(O)-Komplexe. Die Infrarot-, Raman- und 1H-NMR-Spektren werden diskutiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060108
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  • 3
    Electronic Resource
    Electronic Resource
    Über Metallalkyl-Verbindungen, XI Darstellung und Kristallstruktur des MethylkaliumsVorläuf. Mitteil.: E. Weiss und G. Sauermann, Angew. Chem. 80, 123 (1968); Angew. Chem. internat. Edit.7, 133 (1968). (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 265-271 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Alkyl Compounds, XI *) Preparation and Crystal Structure of Methyl PotassiumMethyl potassium could be prepared from (CH3)2Hg and a K/Na-alloy as well as by a metathetical reaction between CH3Li and potassium tert-butoxide. From an X-ray investigation of the crystal powder a hexagonal structure (NiAs-type) was derived for the K-ions and CH3-groups (a = 4.278, c = 8.283 Å, 2 formula units, density 1.37 g/cm3). CH3K is the first methyl metal compound with isolated methyl carbanions in the lattice. Each CH3-group is coordinated by 6 K-ions in a trigonal-prismatic array. Approximate H-positions could be derived from the experimental data. The i. r. spectrum shows that the CH3-group has C3v-symmetry.
    Notes: Methylkalium konnte sowohl aus (CH3)2Hg und einer K/Na-Legierung als auch durch doppelte Umsetzung von CH3Li mit Kalium-tert.-butylat hergestellt werden. Die röntgenographische Untersuchung des Kristallpulvers ergab eine hexagonale Struktur vom NiAs-Typ für die K-Ionen und CH3-Gruppen (a = 4.278, c = 8.283 Å, 2 Formeleinheiten, Dichte 1.37 g/cm3).CH3 K ist die erste Methylmetall-Verbindung mit im Gitter isolierten Methyl-Carbanionen. Jede CH3-Gruppe ist trigonal-prismatisch von 6 K-Ionen koordiniert. Die H-Lagen ließen sich aus den experimentellen Daten nur angenähert bestimmen. Nach dem IR-Spektrum besitzt die CH3-Gruppe C3v-Symmetrie.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030134
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  • 4
    Electronic Resource
    Electronic Resource
    ESR Study of Nitroxide Radicals Generated from Triaz-2-en-1-ols (1996)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 79 (1996), S. 663-669 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The triazenols 4-R1—C6H4—N=N—N(OH)—R2 (1), oxidized with t-BuO⋅2 radicals, produced nitroxide radicals R1—C6H4—N(O⋅)—N=N(R2) +O- (5). The suggested radical structure was confirmed by 15N-labeling. The reaction of triazenols 1 with PbO2 proceeded under N2 elimination, in which case nitroxides R1—C6H4—N(R2)—O⋅(2) were observed as the final radical products. The intermediate R1—C6H4⋅ radicals were identified by spin-trapping.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19960790310
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  • 5
    Electronic Resource
    Electronic Resource
    On the Ligating Properties of Sulfonate and Perchlorate Anions Towards Zinc (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 283-289 
    Details
    ISSN: 0009-2940
    Keywords: Zinc ; Sulfonate ligands ; Perchlorates ; Coordination modes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Attempts are reported to incorporate sulfonate and perchlorate anions as ligands in zinc complexes of tripodal ligands. Using tris(benzimidazolylmethyl)amine (BIMA) only the aqua complexes [ (BIMA)Zn-OH2](RSO3)(ClO4) and [(BIMA)Zn-OH2](RSO3)2(R=CH3, CF3, p-tolyl) were accessible. Using substituted pyrazolylborates (Tp*), the same three sulfonate anions were found to be ligands in the complexes Tp*Zn-OSO2R. Spectroscopic evidence for perchlorate coordination in Tp*ZnClO4 · 2 DMSO conflicts with crystallograpic evidence against it in Tp*ZnClO4 · pyridine. The crystal structures of [(BIMA)Zn-OH2](CH3SO3)2, TpCum,MeZn-OS02CH3, TPtBu,MeZn-OSO2C6H4-p-CH3, and [TpCum,MeZn · NC5H5]ClO4 were determined.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300223
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  • 6
    Electronic Resource
    Electronic Resource
    Zinc Complexes of Amino Acids and Peptides, 9[Part 8: Ref.[1].]. Coordination of Cysteine and Histidine Derivatives to the Pyrazolylborate-Zinc Unit (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1251-1257 
    Details
    ISSN: 0009-2940
    Keywords: Zinc complexes ; Cysteine ligands ; Histidine ligands ; Imidazole ligands ; Pyrazolylborate ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Highly substituted pyrazolylborate ligands TpR,Me were used to limit the coordination number of zinc towards cysteine- and histidine-derived coligands. Monodentate thiolate attachment (→ 1a-f) was achieved with N- and C-protected cysteine, monodentate carboxylate attachment (→ 3) with N-protected histidine. C-protected cysteine was found to form a five-membered N,S-chelate ring (2). While imidazole coordination with N- and C-protected histidine could not be achieved, cationic pyrazolylborate-zinc-coligand complexes [TpZn-L]+ (4a, b) were obtained for L = 2-methylimidazole. The new complexes were characterized by their spectra and three structure determinations.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291017
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  • 7
    Electronic Resource
    Electronic Resource
    Zinc Pyrazolylborate Complexes with Phenoxide and Alkoxide LigandsDedicated to Professor Wolfgang Beck on the occasion of his 65th birthday. (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 975-980 
    Details
    ISSN: 0009-2940
    Keywords: Zinc complexes ; Phenoxide complexes ; Alkoxide complexes ; Terminal alkoxide ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The zinc hydroxide complexes Tp*Zn-OH of highly substituted pyrazolylborate ligands react with phenols, and alcohols, of sufficient acidity, in a condensation reaction with release of H2O. Starting with phenols the following were attached:phenolate, p-nitropehnolate, o-vanillinate, o-hydroxymethylphenolate, o,o-bis(hydroxymethyl) -p-methylphenolate. Whilst aliphatic alcohols and benzyl alcohol did not react, their derivatives, with highly electronegative substituents could be incorporated. Thus, the arylmethoxides OCH2C6F5 and OCH2C6H4NO2-p, as well as the alkoxides OCH2CF3 and OCH2CCl3, were attached. 2-Mercaptoethanol was bound via its thiolate function. The crystal structures of TpCum,Me ZN-OC6H4NO2-p,TpCum,Me ZN-OCH2-C6F5, TpCum,Me ZN-OCH2CF3, TpCum,Me ZN-OCH2CCl3 and TpCum,MeZn-SCH2CH2OH were determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300727
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  • 8
    Electronic Resource
    Electronic Resource
    Hydrolytic Cleavage of Diphosphates, Sulfonatophosphates, and Disulfonates by (Pyrazolylborate)zinc Hydroxide Complexes (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 271-274 
    Details
    ISSN: 1434-1948
    Keywords: Zinc complexes ; Pyrazolylborate ligands ; Hydrolytic cleavage ; Diphosphate ; Sulfonatophosphate ; Disulfonate ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three (pyrazolylborate)zinc hydroxide complexes Tp*Zn-OH were used as hydrolytic reagents to cleave the P-O-P, P-O-S, and S-O-S linkages of organic diphosphates, sulfonatophosphates, and disulfonates. The resulting complexes of the types Tp*Zn-OPO(OR)2 and Tp*Zn-OSO2R could also be obtained by condensation reactions between Tp*Zn-OH and HO-PO(OR)2 or HO-SO2R. Two of them were characterized by structure determinations.
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  • 9
    Electronic Resource
    Electronic Resource
    Syntheses, Structures, and Coordination of Diborylbipyridines and Bipyridinediborates (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 393-398 
    Details
    ISSN: 1434-1948
    Keywords: Boranes ; Bipyridine ; Crystal structures ; Donor-acceptor interaction ; Heterocycles ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 6,6′-Bis(diethylboryl)-2,2′-bipyridine (1a) was obtained in low yield by in situ deprotonation of 2,2′-bipyridine in the presence of diethyl(methoxy)borane. 6,6′-Dilithio-2,2′-bipyridine reacts with various alkoxyboranes leading to bipyridinediborates 2 in good yields. The derivatives 2b and 2c allow the formation of the free diborylbipyridines 1b and 1c. The coordination properties of the diboryl-bipyridines as tetrafunctional donor-acceptor compounds have been used for the formation of the copper complex 4 and of the adduct 5 which is built from diborylbipyridine and a dihydroxydiboroxan derivative. The composition of the products follows from spectroscopic data and from X-ray structure analyses for 2f, 4, and 5.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    (Pyrazolylborate)zinc Organophosphate Complexes Resulting from Hydrolytic Cleavage of Phosphate Esters (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 263-270 
    Details
    ISSN: 1434-1948
    Keywords: Zinc complexes ; Pyrazolylborate ligands ; Phosphate ligands ; Hydrolytic cleavage ; Condensation ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Five different (pyrazolylborate)zinc hydroxide complexes Tp*Zn-OH (1) were used as hydrolytic reagents towards esters of various acids of phosphorus. Trimethyl phosphate and trimethyl phosphite could not be cleaved. Dimethyl and diphenyl phosphite yielded TptBu,MeZn-OPHO(OR) (2, 3). Triphenyl phosphate reacted slowly producing moderate yields of Tp*Zn-OPO(OPh)2 (4). Tris(p-nitrophenyl) phosphate was cleaved rapidly, forming Tp*Zn-OPO(OC6H4NO2)2 (5) and Tp*Zn-OC6H4NO2 (6). Alkylbis(p-nitrophenyl) phosphates showed intermediate reactivity, losing p-nitrophenolate upon hydrolysis and producing Tp*Zn-OPO(OR)(OC6H4NO2) (7, 8). When phosphorus acid diesters were employed, condensation between the Zn-OH and P-OH functions occurred. This proved to be the convenient way of preparing the organophosphate complexes Tp*Zn-OPO(Ph)2 (9), Tp*Zn-OPO(OPh)2 (4), and Tp*Zn-OPO(OC6H4NO2)2 (5). Six structure determinations showed the structural variability of the resulting complexes.
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