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  • 1
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structurally Chemical Investigation of Monoammin Copper (I) Complexes : [CuNH3]2[Pt(CN)6], [CuNH3]2[Pt(CN)4] and Cu3[Co(CN)6] · 2NH3The preparation and the properties of [CuNH3]2[Pt(CN)6], [CuNH3]2[Pt(CN)4] and Cu3[Co(CN)6] · 2NH3 are described. I.R. and Raman spectra have been recorded and assigned. According to X-ray powder diagrams, [CuNH3]2[Pt(CN)6] crystallizes in the trigonal space group D3d3-P3ml, a = 7.771, c = 5.988 Å, Z = 1.According to the spectroscopic and crystallographic data, it is concluded that the CuI ion is coordinated with one NH3 group and with the N atoms of the cyanometallate anions. The coordination number of the Cu+ is 4 in [CuNH3]2[Pt(CN)6] and 3 in [CuNH3]2[Pt(CN)4]. In the Cu3[Co(CN)6] · 2 NH3 complex two Cu atoms have the coordination number 2, the third Cu atom 4.
    Notes: Darstellung und Eigenschaften von [CuNH3]2[Pt(CN)6], [CuNH3]2·[Pt(CN)4] und Cu3[Co(CN)6] · 2 NH3 werden beschrieben. UR- und Raman-Spektren werden gemessen und zugeordnet. Nach Röntgen-Pulverdiagrammen kristallisiert [CuNH3]2[Pt(CN)6] trigonal, a = 7,771, c = 5,988 Å, Raumgruppe D3d3-P3m 1, Z = 1.Aus den spektroskopischen und röntgenographischen Daten wird gefolgert, daß das CuI-Ion außer mit NH3 auch mit N-Atomen der Cyanometallat-anionen koordiniert ist. Die Koordinationszahl des Cu+ ist im [CuNH3]2[Pt(CN)6] 4 und im [CuNH3]2[Pt(CN)4] 3. Im Cu3[Co(CN)6]· 2NH3 haben wahrscheinlich zwei Cu+ die Koordinationszahl 2, das dritte 4.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0009-2940
    Keywords: Tripod ligands ; Donor groups, mixed (P, S) ; Cobalt sulfur compounds ; Iron sulfur compounds ; Five-coordination of cobalt and iron ; Redox chemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tripod Ligands with Neopentane Frame and two Different Donor Groups CH3C(CH2PPh2)2(CH2SR): Synthesis, Structure, Redox Chemistry, and Spectroscopy of the Complexes tripodM{ortho-(X)(Y)C6H4}Prof. Dr. Jörn Müller zum 60. Geburtstag gewidmet.Neopentane-based tripod ligands CH3C(CH2PPh2)2(CH2Z) (Z = SBn, SH, S-) form pentacoordinate compounds [tripodM{ortho(X)(Y)C6H4}]m 1-4 with ortho-phenylene-bridged coligands (X)(Y)C6H4 (X, Y = O-, S-, NH-) and Co(II), Co(III), Fe(II), or Fe(III) as the metal centers. The structures of these complexes are very similar to those observed for CH3C(CH2PPh2)3 as the tripod ligand. The redox potentials, however, for the corresponding one-electron oxidation and reduction processes are highly affected by the change in the tripod donor groups. Both potentials are shifted by a maximum of 700 mV upon replacement of a PPh2 donor group by a sulfur-centered donor with the difference between the potential of the oxidation step and the potential of the reduction step staying almost constant for the whole series of compounds. This difference of around 1.7 eV nicely corresponds to the energy of the HOMO-LUMO chargetransfer bands observed around 2 eV for all of the compounds. It may be inferred therefore that both observations (electron spectroscopy and cyclic voltammetry) refer in a similar way to the HOMO-LUMO gap of the compounds. It is shown that the formation of [tripodCo(III){ortho-(NH)2C6H4}]+(BF4-) from ortho-phenylenediamine as the source of the coligand involves precoordination of the amine ligand followed by deprotonation of the coordinated ligand. The capability of the tripodCo(II) template to form five-coordinate compounds with diamines is further corroborated by the characterization of [tripodCo(en)]2+ (52+). In addition to the standard analytical data, EPR, UV/Vis, cyclovoltammetric data and X-ray structure analyses are presented where appropriate.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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