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  • 1
    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.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    New Tripodal N3S Ligands and Some Zinc Complexes Thereof (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1759-1764 
    Details
    ISSN: 1434-1948
    Keywords: Tripodal ligands ; Nitrogen-sulfur ligands ; Zinc complexes ; Structure determination ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Attachment of 2-pyridylmethyl units to cysteine amide and 2-mercaptobenzylamine leads to the new tripodal N3S ligands Nα-(4-methylbenzoyl)-L-cysteine-bis(2-pyridylmethyl)amide (CBPA-H) and 2-mercaptobenzyl-bis(2-pyridylmethyl)amine (MBPA-H). Their treatment with zinc halides yields the neutral complexes L · ZnHal (Hal = Cl, Br, I). With zinc perchlorate MBPA forms the ionic compound [L · Zn] ClO4, presumed to be a thiolate bridged dimer. Structure determinations of MBPA · ZnHal (Hal = Cl, Br) have confirmed the tripodal nature of the ligand in the trigonal-bipyramidal complexes.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 3
    Electronic Resource
    Electronic Resource
    Cyanide-Bridged Arrays of 2, 3 and 4 Metal Atoms Based on Salene-Iron Complexes - Syntheses, Structures and Metal-Metal Interactions (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 1793-1803 
    Details
    ISSN: 1434-1948
    Keywords: Iron complexes ; Salene ligands ; Cyanide bridging ; Electron transfer ; Metal-metal interactions ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Salene-FeIII complexes of the types LFeCl and [LFe(CN)2]- were treated with organometallic reagents to introduce the cyanide-linked units (CO)5Cr, (CO)5Mo, (CO)5W, Cp(CO)2Fe, Cp(dppe)Fe, and Cp(PPh3)2Ru. IR spectra and structure determinations revealed that all resulting complexes contained M-CN units with N coordination to the salene-Fe units. They were either dinuclear M-CN-Fe(salene), trinuclear M-CN-Fe(salene)-NC-M, or tetranuclear M-CN-Fe(salene)-Fe(salene)-NC-M species. Cyclic voltammetry showed that there are significant electronic interactions between the two outer organometallic units in the trinuclear complexes. UV/Vis spectra indicated a metal-metal charge transfer from the outer Cp(dppe)Fe groups to the central FeIII. The magnetic moments at room temperature of the tri- and tetranuclear complexes are slightly lower than those calculated for isolated high-spin FeIII species.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    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.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Hexakis(alcohol)zinc Complexes (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2009-2012 
    Details
    ISSN: 1434-1948
    Keywords: Zinc complexes ; Alcohol ligands ; Structure and bonding ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hexakis(methanol) and hexakis(ethanol) complexes of zinc were prepared under strictly anhydrous conditions and crystallized as perchlorate or hexafluorosilicate salts in space groups of high symmetry. All their OH functions are engaged in hydrogen-bonded cation-anion networks. Their Zn-O distances correspond to those in [Zn(H2O)6]2+. Their water sensitivity can be explained by a gain in entropy and by a gain in polar interactions upon replacement of alcohol by water ligands.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Zinc Complexes of Tripodal N3O Ligands (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 827-832 
    Details
    ISSN: 1434-1948
    Keywords: Zinc complexes ; Tripodal ligands ; Ligand bridging ; Halide, phenolate, thiophenolate, and phosphate coligands ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The tripodal N,O ligands bis(2-pyridylmethyl)(o-hydroxybenzyl)amine (L1) and bis(2-pyridylmethyl)(2-carboxyethyl)amine (L2) were tested for their ligating properties towards zinc. Zinc halides yielded L1·Zn-Hal (1a-c, Hal = Cl, Br, I) and L2·Zn-Hal (2a-c, Hal = Cl, Br, I). Subsequent treatment of L1 with ZnEt2 or Zn[N(SiMe3)2]2 and phenol, thiophenols or diphenylphosphate led to L1·Zn-OPh (3), L1·Zn-SAr (4) and L1·Zn-OPO(OPh)2 (5). Zinc salts of noncoordinating anions yielded oligonuclear ligand-bridged complexes [L1·Zn]ClO4 (6), [L2·Zn]ClO4 (7) and [L2·Zn]NO3 (8), of which 6 was identified as a phenolate bridged dimer and 8 as a η1-η2-carboxylate bridged polymer.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Zinc-Aldehyde Complexes with Weakly Coordinating Anions (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 117-127 
    Details
    ISSN: 1434-1948
    Keywords: Zinc ; Aldehyde ligands ; Weakly coordinating anions ; Structural chemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zinc salts of low or zero water content were obtained from the hexahydrates of zinc nitrate, zinc perchlorate, and zinc tetrafluoroborate by dehydration with triethoxymethane or by solvation with acetonitrile or nitromethane. The compounds incorporated aldehydes as ligands when treated with an excess of the aromatic aldehydes benzaldehyde, mesitylaldehyde, 2-chlorobenzaldehyde, and 4-fluorobenzaldehyde. Eighteen zinc-aldehyde complexes were isolated and identified by crystal structure determinations. All contain octahedral zinc to which 2, 3, 4, 5, or 6 aldehyde ligands are bound. Water, ethanol, and acetonitrile molecules act as coligands. Of the anions employed, BF4- and SbCl6- were found to be only noncoordinating and NO3- only coordinating, whereas complexes with one or two perchlorate ligands were obtained in addition to perchlorate salts.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Aldehyde Complexes of Zinc Halides (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 129-135 
    Details
    ISSN: 1434-1948
    Keywords: Zinc ; Aldehyde ligands ; Halide ligands ; Structural chemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aldehyde complexes of the zinc halides were obtained by treating ZnCl2, ZnBr2, and ZnI2 under anhydrous conditions with large excesses of benzaldehyde and various substituted benzaldehydes. Their constitutions were determined by a total of 12 X-ray structure analyses. Three product types were found: ZnHal2(aldehyde)2 (A), [ZnHal2(aldehyde)]∞ (B), and [Zn(aldehyde)6] [Zn2Hal6] (C). All three dissolve readily in the corresponding aldehyde or in polar nonprotic solvents indicating the presence of solvated zinc species in solution.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Zinc Complexes of Chelating Aldehydes (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 137-144 
    Details
    ISSN: 1434-1948
    Keywords: Zinc ; Aldehyde ligands ; N,O Chelate ligands ; Structural chemistry ; Chelates ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of various zinc salts with the chelating aromatic aldehydes pyridine-2-carbaldehyde, 6-methylpyridine-2-carbaldehyde, pyridine-2,6-dicarbaldehyde, and 2-dimethylaminobenzaldehyde were studied. The monoaldehydes and zinc halides yielded the tetrahedral chelate complexes ZnHal2·aldehyde. Pyridine-2-carbaldehyde also formed the octahedral bis-chelate complexes ZnHal2·2 aldehyde. The octahedral tris-chelate complexes [Zn(aldehyde)3]2+ were obtained from [Zn(CH3CN)6](SbCl6)2. Pyridine-2,6-dicarbaldehyde was found to be tridentate in the trigonal-bipyramidal complexes ZnHal2·aldehyde. The structural variability in this system was underlined by the identification of the two unusual complexes [(pyridine-2-carbaldehyde)2(H2O)Zn-Cl-ZnCl3] and [ZnI(pyridine-2-carbaldehyde)2]2[ZnI4].
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Schwefelatome als Liganden in Metall-KomplexenHerrn Professor Helmut Behrens zum 60. Geburtstag gewidmet (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 87 (1975), S. 363-371 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die aus der Hauptgruppen-Molekülchemie geläufigen Bindungsarten des Schwefels als Sulfan oder Sulfid sind in der Metallkomplex-Chemie fast unbekannt. Vielmehr fungieren hier Schwefelatome als Zweielektronen-Donor durch Verbrückung von zwei Metallatomen, als Vierelektronen-Donor durch Verbrückung von drei oder vier Metallatomen und als Sechselektronen-Donor durch Einbau zwischen vier Metallatomen. Durch chemische oder elektrochemische Variation der Elektronenzahl in den Komplexen läßt sich dabei die Metall-Metall-Bindung in weitem Bereich beeinflussen. Die Bereitschaft von Metall-Schwefel-Mehrkernkomplexen zu Redox-Reaktionen wird auch von der Natur in den aktiven Zentren einiger Redox-Proteine genutzt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19750871002
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