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  • 1
    Digitale Medien
    Digitale Medien
    Strukturelle Charakterisierung der Dicyanamid-Komplexe von Kupfer(II), Nickel(II) bzw. Kobalt(II) mit Aminopyridinen (1992)
    Springer
    Monatshefte für Chemie 123 (1992), S. 493-500 
    Details
    ISSN: 1434-4475
    Schlagwort(e): Aminopyridines ; Dicyanamide complexes ; ESR spectra ; Ligand field spectra ; Magnetic moments
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary New dicyanamide complexes of the typeM[N(CN)2]2 L 2 (M=Cu or Ni;L=2-, 3-, 4-aminopyridine, 2-amino-5-nitropyridine) and Co[N(CN)2]2 (2-amino-5-nitropyridine)2 were prepared and studied by spectroscopic methods as well as by room-temperature magnetic moments. The results show that the Cu(II) complexes have elongated pseudooctahedral structures while the Ni(II) and Co(II) complexes are octahedral. In most cases the N(CN)2 groups are in bridging function and through their cyanide nitrogens, or-more rarely-amide and cyanide nitrogens connect the basic structure units into polymeric conglomerates. In the Cu(II) systems exchange coupling is seen from the μeff value or ESR spectrum.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00816842
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  • 2
    Digitale Medien
    Digitale Medien
    Der Einfluß von methyl- und dimethylsubstituierten Pyridinen als Liganden auf die Struktur und den Elektronentransfer bei Thiocyanat-Kupfer(II)-Komplexen (1976)
    Springer
    Monatshefte für Chemie 107 (1976), S. 641-651 
    Details
    ISSN: 1434-4475
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Complexes of the type Cu(NCS)2 L 2 whereL are all isomeric picolines and lutidines, as well as those of the type Cu(NCS)2 L 3 forL=β-, γ-picoline, 3,4-, and 3,5-lutidine were prepared. The complexes were studied by means of thermal decomposition, and by electronic andESR spectroscopy. The results obtained have been brought into correlation with the effect of the ligandsL being caused by the methyl groups on the pyridine ring. It has been found that the differences in the properties studied which appear between Cu(NCS)2 L 2 and Cu(NCS)2(pyridine)2 are conditioned especially by the steric effect of the ligandsL with the methyl group in α-position. The other ligandsL, however, show also an influence on some properties of the respective complexes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00906770
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  • 3
    Digitale Medien
    Digitale Medien
    Studium des gegenseitigen Einflusses der Bindungen in Thiocyanat-Kupfer(II)-Komplexen mit Methyl- und Dimethylpyridinen mittels Infrarotspektroskopie (1977)
    Springer
    Monatshefte für Chemie 108 (1977), S. 1011-1018 
    Details
    ISSN: 1434-4475
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The infrared spectra of thiocyanato-copper(II) complexes of the type Cu(NCS)2 L 2 with all isomeric picolines and lutidines (L) as well as those of the type Cu(NCS)2 L 3 withL=3- and 4-picoline, 3,4- and 3,5-lutidine were measured. The behaviour of the ν (CN) stretching vibrations of the Cu(NCS)2 L 2 complexes led to conclusions on the different kind of coordination of the NCS groups in dependence on the ligandL. The mutually conditioned strength of the Cu−NCS and Cu−N(L) bonds in the equatorial plane, especially in the presence of ligandsL with the steric effect, was determined from the frequency shift of the Cu−NCS and Cu−N(L) stretching vibrations with regard to the vibrations for Cu(NCS)2(pyridine)2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00897681
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  • 4
    Digitale Medien
    Digitale Medien
    Einfluß der Alkylgruppen auf die Struktureigenschaften der Cyanato-Kupfer(II)-Komplexe mit Alkylpyridinen (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 1143-1153 
    Details
    ISSN: 1434-4475
    Schlagwort(e): Alkylpyridines ; Cyanatocopper(II)complexes ; ESR spectra ; Solid state electronic spectra ; Torsional isomers
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract New cyanato-copper(II) complexes of the type Cu(NCO)2 L 2 (L=2,3-, 2,5-, 3,4- or 3,5-lutidine, 3- or 4-ethylpyridine) and Cu(NCO)2 L (L=2,3- or 2,5-lutidine, 2-ethylpyridine) were prepared. Solid state electronic, ESR and IR spectral results show, that Cu(NCO)2 L 2 complexes have tetragonal structures varying from pseudooctahedral to practically planar forms, also involving a square-pyramidal arrangement. The β-form of Cu(NCO)2(2-picoline)2 was isolated and found to be a distortion isomer of the known α-form. According to physical results, Cu(NCO)2 L complexes exhibit highly distorted five-coordinate structures. Further knowledge about the influence of type, number and position ofL ligand alkyl groups on the structure-bonding properties of cyanato-copper(II) complexes was obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00905469
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  • 5
    Digitale Medien
    Digitale Medien
    X-ray crystallographic and physical investigation of tricyanomethanide and dicyanamide complexes of cobalt(II) with imidazole and its methyl derivatives (1995)
    Springer
    Transition metal chemistry 20 (1995), S. 276-279 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Reaction of CoII with N(CN) inf2 sup− or C(CN) inf3 sup− in the presence of imidazole (iz) or its methyl derivatives (2-meiz and 4-meiz) gave eight compounds of CoII: ligand stoichiometry 1∶2, including two isomeric pairs (α and β) for the complexes [Co{C(CN)3}2(2-meiz)2] and [Co{C(CN)3}2-(4-meiz)2]. The complexes were studied by electronic and i.r. spectroscopies. For α-[Co{C(CN)3}2(2-meiz)2] singlecrystal X-ray analysis was performed; its crystal structure consists of one-dimensional chains, formed by C(CN) inf3 sup− anions bridging between the CoII atoms. The CoII atom is nearly octahedrally coordinated by two tertiary nitrogens of 2-meiz and four nitrogens of C(CN) inf3 sup− . The spectra of these compounds and of the complexes with iz, as well as that of α-[Co{C(CN)3}2(4-meiz)2], indicate all these compounds to have basically the same bridging polymeric octahedral structure. However, the spectra indicate distorted tetrahedral structures for the remaining compounds.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00143492
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  • 6
    Digitale Medien
    Digitale Medien
    Cyanato-copper(II) complexes with organic ligands, Part XXIII. Properties and structure characterization of cyanato-copper(II) complexes with aminopyridines (1985)
    Springer
    Transition metal chemistry 10 (1985), S. 155-159 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary New cyanato-copper(II) complexes with aminopyridines (ampy) were prepared and studied;viz. Cu(NCO)2(3-ampy)2 (α- and β-form), Cu(NCO)2(3-ampy)2(H2O), Cu(NCO)2(4ampy)2, and Cu(NCO)2(2-ampy). According to physical results, the Cu(NCO)2L2 complexes exhibitpseudo-octahedral structures with amine nitrogens or cyanate oxygens occupying axial sites. For α- and β-Cu(NCO)2(3-ampy)2 the crystal structure reorganization is connected with a change in axial distortion. The compound Cu(NCO)2(2-ampy) is square pyramidal or — more probably — rhombic octahedral and its strong antiferromagnetism reveals the N-bridging function of the NCO groups.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00641589
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  • 7
    Digitale Medien
    Digitale Medien
    Dicyanamide complexes of copper(II), nickel(II) and cobalt(II) with benzimidazole and its 2-alkyl-derivatives (1993)
    Springer
    Transition metal chemistry 18 (1993), S. 579-582 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary Dicyanamide complexes of CuII, NiII and CoII of the type M[N(CN)2]2L2, where L = benzimidazole, 2-methyl- or 2-ethylbenzimidazole, have been prepared and studied by spectroscopy and magnetochemistry. The complexes, except for Co[N(CN)2]2 (benzimidazole)2, are six-coordinate, involving bidentate bridging dicyanamide groups. While the NiII complexes have practically octahedral structures, the CuII complexes are pseudooctahedral with similar tetragonal distortion. The ligand field strength in these complexes depends mainly on the steric effect of the benzimidazole ligands. The CoII complex of benzimidazole is monomeric tetrahedral, but that of 2-ethylbenzimidazole is tetragonal octahedral. The oridging function of dicyanamide in the six-coordinate complexes is realized either through both cyanide or through amide and cyanide nitrogens. The complex Cu[N(CN)2]2 (2-methylbenzimidazole)2 is a weak antiferromagnet (J = -0.1 cm−1), exhibiting under ca. 15 K a long-range antiferromagnetic ordering.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00191127
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetic and spectral properties of the coligand isomer pair: Cu{N(CN)2}2(pyrazole)2 and Cu{pyrazole · N(CN)2}2 (1986)
    Springer
    Transition metal chemistry 11 (1986), S. 481-484 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Summary New coligand isomers of composition Cu{N(CN)2}2(pz)2 and Cu{pz · N(CN)2}2 (pz = pyrazole) were prepared and studied by measuring their magnetic susceptibilities up to 4.2K and by aid of their e.s.r., ligand field and i.r. spectra. The susceptibility data have been analysed with various models for the exchange-coupled copper(II) polymers. It is shown that the resultant exchange coupling is ferromagnetic for Cu{N(CN)2}2(pz)2 (J ∼ 1.1 - 1.4 cm−1) but antiferromagnetic for Cu{pz · N(CN)2}2 (J ≈ −0.4 cm−1). A polymeric chain structure is proposed for Cu{N(CN)2}2(pz)2 havingpseudo-octahedrally coordinated copper(II) and CN-bridging dicyanamide ligands. Its coligand isomer contains anionic chelate ligands, formed by nucleophilic addition between N(CN)2 and pz in the copper(II) coordination sphere, and giving with this central atom a square-planar system. Definite, but slight axial interaction takes place between these structure units.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01386883
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  • 9
    Digitale Medien
    Digitale Medien
    Nucleophilic addition of methanol to nitrosodicyanomethanide in the coordination sphere of MII ions (M = Ni, Cu, Co and Pd); nitrosodicyanomethanide as an O-coordinating ligand for nickel(II) (1998)
    Springer
    Transition metal chemistry 23 (1998), S. 215-220 
    Details
    ISSN: 1572-901X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The systems MII-ONC(CN)2 −-L-MeOH-H2O [M = Ni, Cu, Co or Pd; L = pyrazole (pz)] were studied to determine conditions for the nucleophilic addition of MeOH to nitrosodicyanomethanide (ndcm)− in the metal coordination sphere. Compounds containing two or three bidentate anionic chelate ligands derived from methyl-2-cyano-2-(hydroxyimino)ethanimidic acid, H(mcoe), formed by nucleophilic addition of MeOH to ONC(CN)2 −, were isolated: [Cu(mcoe)2(H2O)2] (elongated pseudo-octahedron with two water molecules at long axial distances), [Co(mcoe)3] (approximate octahedron) and [Pd(mcoe)2] (square-planar). In the CoII system, oxidation to CoIII took place. In addition, simple nitrosodicyanomethanide compounds [Ni(ndcm)2(pz)4] (nearly octahedral) and [Pd(ndcm)2(pz)2] (square-planar) were obtained. The crystal structure of trans-[Ni(ndcm)2(pz)4] has been elucidated by X-ray crystallography. The NiII atom is nearly octahedrally coordinated by four nitrogens of pz and two oxygens of (ndcm)−. This compound is the first example of a transition metal oxygen-coordinated nitrosodicyanomethanide complex with a short metal-oxygen bond. The remaining compounds were characterized by i.r. and electronic spectra.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1015763506523
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