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  • Springer  (21)
  • International Union of Crystallography (IUCr)  (1)
  • 2000-2004  (3)
  • 1985-1989  (19)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Bis(2-pyridiniomethyleneaminoguanidinium) trans-tetraaquadichloronickel(II) dichloride tetrahydrate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. m137-m139 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: In the title compound, (C7H11N4)2[Ni(H2O)4Cl2]Cl2·4H2O, the Ni complex occupies a special position on the twofold axis; both cation and anions, as well as the water molecules, are in general positions. The multiple crystallographically independent hydrogen bonds form an infinite three-dimensional network in the crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801003725
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  • 2
    Electronic Resource
    Electronic Resource
    Plasma desorption mass spectrometry of transition metal complexes of thio- and selenosemicarbazones of 2-acetylpyridines (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 141-147 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Californium-252 plasma desorption mass spectra were recorded for complexes of the anions of various thio-and seleno-semicarbazones of 3-acetylpyridines(1–4) with the transition metal ions iron(III) and cobalt(II). Positive ion spectra gave clear evidence of the cation present and fragmentation with loss of ligands or parts of ligands was straightforward. Negative ion spectra likewise provided evidence of the intact anion except with tetracoordinate metal halide systems [MX4]− which lost one or more halide atoms. Evidence of fragmentation of the ligand and recombination of the fragments with the metal ion was also observed in the negative ion mode. Spectra were used to revise the structure of a complex previously reported as [FeLCl2](1) to [FeL2]+[FeCl4]−.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641584
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  • 3
    Electronic Resource
    Electronic Resource
    Nickel(II) complexes of a thiosemicarbazone prepared from 2-Acetylpyridine (1986)
    Springer
    Transition metal chemistry 11 (1986), S. 123-131 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The ligand 3-azabicyclo[3.2.2]nonane-3-thiocarboxylic acid 2-[1-(2-pyridinyl)ethylidene]hydrazide (HL), which is observed in an unusual tautomeric form in the solid state, and its selenium analogue (HLSe) have been used to prepare a series of nickel(II) complexes. Compounds of the general formula [NiLX] (X=Cl, Br, NCS, N3, NO2 or NCSe) as well as [Ni(LSe)Cl] have been found to be diamagnetic, planar complexes. A single crystal study of [NiL(NCS)] shows the deprotonated ligand bound in a tridentate mannervia its pyridyl nitrogen, imine nitrogen and the thione sulphur atom with the nitrogen atom of the thiocyanato-ligand occupying the fourth coordination position. The solids prepared from the nickel(II) salts having tetrafluoroborate, nitrate and iodide ions approximate to octahedral symmetry and have neutral HL ligands coordinated in a bidentate fashionvia the pyridine and imine nitrogens with the remaining coordination sites being occupied by the anions or water molecules. The [NiL2] solid is also octahedral with the two deprotonated ligands bonding as tridentate groupsvia the same atoms as in the [NiLX] complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637013
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  • 4
    Electronic Resource
    Electronic Resource
    2-amino-4,6-lutidineN-oxide complexes formed from various copper(II) salts (1986)
    Springer
    Transition metal chemistry 11 (1986), S. 151-155 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Copper(II) complexes of 2-amino-4,6-lutidineN-oxide (4,6DMAH) have been isolated as tetrafluoroborate, nitrate, chloride and bromide salts, and characterized by spectral methods (i.e., i.r., u.v.-vis. and e.s.r.). Variation of the ligand-to-copper(II) ratio yielded solids having the following empirical formulae: [Cu(4,6DMAH)4]X2 (X=BF4), [Cu(4,6DMAH)2X2] (X=NO3, Cl) and [Cu(4,6DMAH)X2] (X=Br). In addition, a deprotonated ligand complex, Cu(4,6DMA)2, was prepared using copper(II) acetate. The Sigand usually binds to the copper(II) centresvia theN-oxide oxygen and only the deprotonated ligand coordinatesvia the exocyclic nitrogen as well as the TV-oxide oxygen. The complexes involving coordinated anions and at least two ligands are monomeric while Cu(4,6DMAH)Br2 is polymeric. The ring substituents affect either the stoichiometry or the stereochemistry of these solids when compared to less sterically demanding 2-aminopyridineN-oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637017
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  • 5
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of theS-methyldithiocarbazate prepared from 2-acetylpyridineN-oxide (1989)
    Springer
    Transition metal chemistry 14 (1989), S. 190-194 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Metal ion complexes of theS-methyldithiocarbazate of 2-acetylpyridineN-oxide, HONS, have been prepared and characterised by spectral and physical methods. Preparative ethanolic solutions on reflux yield complexes in which the deprotonated form of the ligand, ONS, is complexedvia itsN-oxide oxygen, azomethine nitrogen, and thione sulphur. Representative stoichiometries are as follows: [M(ONS)2]X (M=Fe3+, and X=ClO 4 − , FeCl 4 − or M=Co3+ and X=BF 4 − ) and [M(ONS)X] (M=Co2+, Ni2+ and Cu2+ and X=Cl−, Br−). The i.r., electronic, and electron spin resonance spectra of the complexes are compared to analogous complexes of theX-methyldithiocarbazate of 2-acetylpyridine as well as the thiosemicarbazones of 2-acetylpyridineN-oxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043792
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  • 6
    Electronic Resource
    Electronic Resource
    Copper(II) complexes of 2-pyridineformamide N(4)-methylthiosemicarbazone (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 80-83 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Reduction of 2-cyanopyridine by sodium in dry MeOH in the presence of N(4)-methylthiosemicarbazide produces 2-pyridineformamide N(4)-methylthiosemicarbazone, HAm4M. Copper(II) complexes have been prepared and characterized by molar conductivities, magnetic susceptibilities and spectroscopic techniques. Coordination is via the pyridyl nitrogen, imine nitrogen and thione or thiolato sulfur, when coordinating as the neutral or anionic ligand, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007034627143
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  • 7
    Electronic Resource
    Electronic Resource
    Spectral studies of metal complexes of a new type of bis(thiosemicarbazone) (2000)
    Springer
    Transition metal chemistry 25 (2000), S. 241-246 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Cobalt(II), nickel(II) and copper(II) complexes of two new bis(di-2-pyridyl ketone) dithiosemicarbazones have been prepared in EtOH solution and characterized by physical and spectral methods. The bis(di-2-pyridyl ketone) dithiosemicarbazones were prepared from dithiosemicarbazides derived from piperazine and N,N′-dimethylethylenediamine. N.m.r., i.r., and electronic spectra of the dithiosemicarbazones and their complexes along with e.s.r. spectra of the copper(II) complexes have been recorded. The complexes are bi-, tri- and tetranuclear and involve the dithiosemicarbazones coordinating as dianionic, anionic and neutral ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007095116629
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  • 8
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of a thiosemicarbazone derived from 6-methyl-2-acetylpyridine (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 41-45 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A series of metal ion complexes of the thiosemicarbazone, 3-azabicyclo[3.2.2]nonane-3-thiocarboxylic acid 2-[1-(6-methyl-2-pyridinyl)ethylidene]hydrazide (6 MLH) have been prepared and spectrally characterized. The ligand undergoes deprotonation to coordinatevia the thione sulphur, the imine nitrogen and the pyridyl nitrogen. A single anionic ligand such as Cl−, Br− and NO3 − completes the bonding to the CuII and NiII centre. The compound derived from CoCl2 contains two 6 MLH ligands bound to a CoII centre and a CoCl 4 2− counter ion. Complexes derived from perchlorate salts may feature 6 MLH, 6 ML, or both with the CoII being oxidized to CoIII. The solids were characterized by i.r., electronic and e.s.r. spectroscopy. In addition, electronic and e.s.r. spectra of their chloroform solutions were recorded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624201
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  • 9
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of theS-methyldithiocarbazate prepared from 2-acetylpyridine (1989)
    Springer
    Transition metal chemistry 14 (1989), S. 195-199 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Metal ion complexes of 2-acetylpyridineS-methyldithiocarbazate, HNNS, have been prepared and spectrally characterised. Preparations in EtOH yield complexes in which the deprotonated ligand, NNS, is complexedvia its pyridyl nitrogen, azomethine nitrogen, and thione sulphur. The stoichiometries are: [M(NNS)2]X (M=Fe3+, Co3+ and X=ClO 4 − , [FeCl4]−, BF 4 − , 1/2 [CoCl4]2− and 1/2 [CoBr4]2−), [M(NNS)X] (M=Ni2+, Cu2+ and X=Cl−, Br−), [Cu(NNS)H2O]BF4 and ‘Ni(HNNS)(NNS)F(EtOH)]BF4. The spectral (i.e., i.r., u.v.-vis.-n.i.r. and e.s.r.) and physical properties of these complexes are compared to those of theS-methyldithiocarbazates of 2-formylpyridine and 2-acetylpyridineN-oxide, as well as the related thiosemicarbazones prepared from 2-acetylpyridine. Thermal studies of the nickel(II) complexes indicate that the nature of thermal decomposition of coordinated NNS is different from that of HNNS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043793
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  • 10
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of thiosemicarbazones derived from 2-acetylpyridineN-oxide. I. The 4-methyl derivative (1986)
    Springer
    Transition metal chemistry 11 (1986), S. 131-137 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary TheN-methyl-2-[1-(2-pyridinyl-1-oxide)ethylidene]hydrazinecarbothioamide, HLO4M, has been used to prepare a series of CoIII, NiII and CuII complexes. Species with two deprotonated LO4M ligands, one LO4M and one HLO4M ligand, two HLO4M ligands and one HLO4M ligand with two small anionic ligands have been isolated. The deprotonated LO4M bonds as a tridentate ligandvia theN-oxide oxygen, the imine nitrogen (N1 and the sulphur while the HLO4M ligand coordinates primarily as a bidentate ligandvia only the first two atoms listed above. I.r., electronic, mass and e.s.r. spectra have been used to determine the nature of these complexes. One of the more striking differences between these compounds and those prepared with other thiosemicarbazones of 2-acetylpyridine and 2-acetylpyridineN-oxide is that tetrahedral yellow [Ni(HL)X2] rather than planar brown [NiLX] (X=Cl or Br) solids have been isolated with this ligand. Other differences in the nature of the coordination spheres of the various metal ions occur with this particular ligand when compared to previously studied thiosemicarbazone complexes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637014
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