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  • 1985-1989  (19)
Source
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of thiosemicarbazones derived from 2-acetylpyridine. Part 1. The4N-methyl derivative (1987)
    Springer
    Transition metal chemistry 12 (1987), S. 365-370 
    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,N-methyl-2[1-(2-pyridinyl)ethylidene]-hydrazinecarbothioamide (HL4M) has been prepared and spectrally characterized. HL4M coordinates either as a neutral bidentate ligand (i.e., pyridyl N and imine N) or as deprotonated tridentate ligand (i.e., pyridyl N, imine N and thiol sulphur). The cobalt(II) salts yield hexacoordinated cobalt(III) cations, and an isoelectronic species, [Ni(L4M)2], has been formed from Ni(C2H3O2)2. The remaining nickel(II) complexes involve the neutral ligand, as do two of the three copper(II) complexes. HL4M possesses a weaker ligand field and has less covalency in its bonding than related thiosemicarbazones that possess anN-dialkyl-function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024037
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  • 2
    Electronic Resource
    Electronic Resource
    Metal ion complexes of 2-picolinamineN-oxide (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 29-34 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A series of cobalt(II), nickel(II) and copper(II) complexes of 2-picolinamineN-oxide, HA, has been prepared. Solids of formula [M(HA)3](BF4)2 (M=cobalt(II) or nickel(II); [Cu(HA)2]X2 (X=BF 4 − , NO 3 − ); [Co(HA)2X2] (X=Cl− or Br−); [Ni(HA)2Cl2] and [Cu(HA)X2] (X=Cl− or Br−] have been isolated and characterized by partial elemental analyses, molar conductivities, magnetic susceptibilities, DSC-TGA, and spectral methods. All complexes were found to be monomeric, and their spectral parameters are compared with those of the metal ion complexes ofN-alkyl-2-picolinamineN-oxides, 2-dialkylaminopyridineN-oxides and 2-picolinamine. The cobalt(II) and nickel(II) halide complexes spectrally show a mixture of octahedral and tetrahedral centres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041494
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and spectroscopic studies of metal(II) complexes prepared withN-2-(5-picolyl)-N′-phenylthiourea (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 53-57 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The chlorides and bromides of cobalt(II), nickel(II) and copper(II) along with the acetates of the latter two metal ions and copper(II) tetrafluoroborate were used to prepare complexes ofN-2-(5-picolyl)-N′-phenylthiourea (5MTUH). 5MTUH coordinates as a bidentate ligand via the pyridyl nitrogen and the sulphur atoms in the cobalt(II) complexes and the compounds isolated with Cu(BF4)2 and CuCl2. Complexes of stoichiometry [Cu(5MTU)X] (X=Br or C2H3O2) appear to have the deprotonated ligand coordinated via the pyridyl andN′ thioamide nitrogens and the sulphur atom. The nickel(II) complexes involve monodentate 5MTUH with sulphur being the donor atom. A violet, octahedral [Co(5MTUH)2Cl2] complex and a blue, tetrahedral [Co(5MTUH)Cl2] complex have been isolated, but with CoBr2 only an octahedral complex could be prepared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01041500
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  • 4
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of thiosemicarbazones derived from 2-acetylpyridine. Part 2. The4 N-dimethyl derivative (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 277-280 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Metal ion complexes of the thiosemicarbazone,N-dimethyl-2-[1-(2-pyridinyl)ethylidene]hydrazinecarbothioamide (HL4DM) have been prepared and characterized spectrally. HL4DM coordinates primarily as the deprotonated tridentate ligand (i.e., pyrïdylN, azomethineN, and thione sulphur). In contrast to related thiosemicarbazones, oxidation to cobalt(III) does not occur during complex formation with cobalt(II) halides. Oxidation does occur on reflux with ethanolic Co(BF4)2, but we isolated a planar cobalt(II) complex as well. Only with the tetrafluoroborate salts of cobalt(II) and nickel(II) are complexes isolated containing the neutral thiosemicarbazone. Square planar [Ni(L4DM)X]complexes where X=Cl, Br, and OH have been isolated and e.s.r. spectra of a 1% Cu/Ni complex are compared to the results of other workers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025673
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  • 5
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of thiosemicarbazones derived from 2-acetylpyridine. Part 3. The 3-hexamethyleneimine derivative (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 410-414 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Metal ion complexes of the thiosemicarbazone, 3-hexamethyleneimine-3-thiocarboxylic acid-2-[1-(2-pyridyl)-ethylidene]hydrazide (HLhexim) have been prepared and spectrally characterized. HLhexim coordinates primarily as the deprotonated tridentate ligand (i.e., pyridylN, azomethineN, and thione sulphur). The air oxidised cobalt(III) complex, [Co(LHexim)2] (BF4), was isolated from the preparation with cobalt(II) tetrafluoroborate, but other cobalt(II) salts yielded tetrahedral cobalt(II) compounds. Planar nickel(II) and copper(II) complexes were isolated from preparations with halide salts. Significant differences in the spectral properties of the various complexes are observed when compared to other thiosemicarbazones prepared from 2-acetylpyridine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043699
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  • 6
    Electronic Resource
    Electronic Resource
    Transition metal ion complexes of thiosemicarbazones derived from 2-acetylpyridine. Part 4. The 3-piperidinyl derivative (1988)
    Springer
    Transition metal chemistry 13 (1988), S. 415-419 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Metal ion complexes of the thiosemicarbazone, 3-piperidinyl-3-thiocarboxylic acid-2-[1-(2-pyridyl)ethylidene]hydrazide (HLpip) have been prepared and spectrally characterized. HLpip coordinates both as the deprotonated ligand (i.e., pyridylN, azomethineN, and thione sulphur) and the neutral ligand (i.e., pyridylN and azomethineN) with the sulphur possibly weakly coordinating in [Ni(HLpip)2](BF4)2. All three preparative cobalt(II) salts yielded cobalt(III) cationic complexes. The nickel(II) and copper(II) chloride salts gave [M(Lpip)Cl] solids while complexes involving the neutral ligand were prepared with the corresponding bromide salts. Significant differences in the spectral properties of the various complexes are observed when compared to other thiosemicarbazones prepared from 2-acetylpyridine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01043700
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Copper(II) complexes of 2-(pyrrolidinomethyl)- and 2-(3-pyrrolinomethyl)pyridine N-oxides (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 131-134 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary This title pyridine N-oxides have been prepared and their copper(II) complexes isolated as perchlorate, tetrafluoroborate and nitrate salts. The ligands coordinatevia both the pyridine N-oxide oxygen and the amine nitrogen to give bis(ligand) complexes for the perchlorate and tetrafluoroborate salts. The nitrate solids have [CuL(NO3)2] stoichiometry with monodentate nitrato-ligands. The spectral properties of these complexes are compared to those of N-alkyl-and N,N-dialkyl2-picolinamine N-oxides as well as other 2-substituted pyridine N-oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00641582
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    2-Amino-3-picolineN-oxide complexes formed from various copper(II) Salts (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 201-206 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Copper(II) complexes of 2-amino-3-picolineN-oxide (3 MA) have been isolated as perchlorate, 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) salt ratio yielded solids having the following empirical formulas: Cu(3 MA)4X2 (X = ClO4, BF4 or NO3), Cu(3 MA)2X2 (X = NO3, Cl or Br) and Cu(3 MA)X2 (X = Cl). In addition, a deprotonated ligand complex, Cu(3 MA-H)2, was prepared by treating an aqueous slurry of Cu(3 MA)4(ClO4)2 with NaOH. This complex is considered to be square planar, but does associate to form a dimer in nonpolar solvents such as CHCl3. The complexes involving coordinated anions appear to be polymeric and to contain halogen orN-oxide oxygen bridging ligands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692626
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