Bibliothek

feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Inorganic Chemistry  (3)
  • Schiff bases  (1)
  • 1
    ISSN: 1434-1948
    Schlagwort(e): Macrocycles ; Nickel ; Redox chemistry ; Schiff bases ; S ligands ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: A single crystal X-ray analysis of [Ni2L1](ClO4)2· MeCN · 1/4 H2O, 1a [formed directly from a mixture of nickel(II) template ions, 2,6-diformyl-4-methyl-thiophenolate, and 1,4-diaminobutane] reveals that the nickel(II) ions are in square-planar N2S2 environments and that the four “bowed” dinickel macrocycles in the asymmetric unit pack around a single central perchlorate template ion encapsulating it to form “star” clusters of stoichiometry {[Ni2L1]4(ClO4)}7+. These “stars” stack together, via π-π-stacking interactions, to form two-dimensional sheets, which are separated from one another by layers of the remaining perchlorate anions and solvent molecules. Reduction, by NaBH4, of the four imine bonds in [Ni2L2](ClO4)22a (analogous to 1a but formed from 1,3-diaminopropane not 1,4-diaminobutane) or [Ni2L2](CF3SO3)22b to amine bonds produces the corresponding tetra-amine complex, [Ni2L3](ClO4)23. These complexes are shown to contain diamagnetic nickel(II) ions by a combination of magnetic, NMR and UV/Vis spectroscopic results. The 1H NMR spectra of 1-3 run in [D3]MeNO2 and in [D3]MeCN are consistent with increasing axial binding ability in the order: 3 〈 2 〈 1. Thiocyanate ion binding studies reveal that 1 and 2 are able to coordinate two thiocyanate ions, forming [Ni2L1(NCS)2] 4 and [Ni2L2(NCS)2] 5 respectively, whereas 3 does not. Single crystal X-ray analyses of complexes 4· 2 MeCN and 5· MeCN show that adjacent square-planar and octahedral nickel(II) ions result. Two one-electron oxidations and two one-electron reductions are a feature of the electrochemistry of 1-3 in MeCN: curiously, the potentials for the oxidation processes are almost invariant whereas those for the reduction processes vary as anticipated. EPR spectroscopy shows that the first one-electron reduction process and the first one-electron oxidation process are metal centred. Spectroelectrochemical studies and redox titrations indicate that a purplish-coloured complex is produced by one-electron oxidation of 2 (λ = 870 nm, ε = 1320 L mol cm-1). The synthesis of a phenolate analogue, [Ni2L′(MeCN)4](ClO4)2 (6), of the thiophenolate complex 2a is also detailed. Complex 6 undergoes two one-electron oxidations in MeCN, but, in contrast to the thiophenolate complexes 1-3, these occur at much higher potentials. Only a single one-electron reduction process is observed and this occurs at a more negative potential than for any of 1-3.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 1373-1375 
    ISSN: 0009-2940
    Schlagwort(e): Samarium complexes ; Iron complexes ; Lanthanides, organo- ; Heterodimetallic complexes ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Organolanthanide(II) Chemistry: Synthesis and Structure of [Cp*Sm(μ-OC)2FeCp*]2The tetranuclear complex [Cp*Sm(μ-OC)2FeCp*]2 (3) has been prepared by reaction of Cp*2Sm(THF)2 with [Cp*Fe(CO)2]2 and structurally characterized by single-crystal X-ray diffraction.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2223-2225 
    ISSN: 0009-2940
    Schlagwort(e): Lithium, two-coordinate ; Lithium-nitrogen heterocycle ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: [LiN(SiMe3)Ar]2 (1, Ar = 2,6-iPr2C6H3) is prepared by the reaction of HN(SiMe3)Ar with nBuLi in n-hexane. This compound with an unusual structure contains a four-membered [LiN]2 heterocycle with two solvent-free two-coordinate Li centers. Its molecular structure represents the first solid-state X-ray analysis of an uncomplexed [LiN]2 dimer.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    ISSN: 0044-2313
    Schlagwort(e): Bis(thiophenolato)metal complexes ; preparation ; structure ; Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Preparation and Structures of Monomeric Bis(thiophenolato)metal(II) ComplexesSodium-2,4,6-tris(trifluoromethyl)thiophenolate (NaSRf) reacts with MCl2 (M = Zn, Pb) in the molar ratio of 2:1 to form the bis(thiophenolato)metal(II)complexes bis[2,4,6-tris(trifluoromethyl)thiophenolato]zinc 1 and bis[2,4,6-tris(trifluoromethyl)thiophenolato]lead 2. Reaction of Mn[N(SiMe3)2]2· THF with two equivalents of 2,4,6-tris(trifluoromethyl)thiophenol (RfSH) forms Mn(SRf)2 · THF 3. All compounds crystallize as THF adducts. The structures of Zn(SRf)2 · 2THF 1a, Pb(SRf)2 · THF 2a and Mn(SRf)2 · 2THF 3a are discussed.
    Notizen: Natrium-2,4,6-tris(trifluormethyl)thiophenolat(NaSRf) reagiert mit MCl2 (M = Zn, Pb) im Molverhältnis 2 : 1 zu den Bis(thiophenolato)metall(II)-Komplexen Bis[2,4,6-tris(trifluormethyl)thiophenolato]-zink 1 und Bis[2,4,6-tris(trifluormethyl)thiophenolato]blei 2. Bei der Reaktion von Mn[N(SiMe3)2]2· THF mit zwei äquivalenten 2,4,6-Tris(trifluormethyl)thiophenol (RfSH) wird Mn(SRf)2· THF 3 erhalten. Alle Verbindungen kristallisieren als THF-Addukte. Die Kristallstrukturen von Zn(SRf)2· 2 THF 1a, Pb(SRf)2· THF 2a und Mn(SRf)2· 2THF 3a werden diskutiert.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...