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Volumn 44, Issue 26, 2005, Pages 9743-9751

X-ray diffraction and EXAFS studies of hydroxo-Cu(II) complexes based on a calix[6]arene-N3 ligand: Evidence for a mononuclear-dinuclear equilibrium controlled by supramolecular features

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EID: 31044453153     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic0511322     Document Type: Article
Times cited : (26)

References (59)
  • 1
    • 0000122198 scopus 로고    scopus 로고
    • Reviews of bioinorganic enzymology: Chem. Rev. 1996, 96, 2237-3042.
    • (1996) Chem. Rev. , vol.96 , pp. 2237-3042
  • 30
    • 11144321884 scopus 로고    scopus 로고
    • International XAFS Society: Chicago, IL
    • (d) IXS Standards and Criteria Subcommittee; Error Reporting Recommendations; International XAFS Society: Chicago, IL, 2000; http://ixs.iit.edu/subcommittee_reports/sc/.
    • (2000) Error Reporting Recommendations
  • 32
    • 0004938438 scopus 로고    scopus 로고
    • (b) Bandyopadhyay, P. Mucal; http:// ixs.csrri.iit.edu/database/programs/ mcmaster.html.
    • Mucal
    • Bandyopadhyay, P.1
  • 37
    • 31044436424 scopus 로고    scopus 로고
    • note
    • The EPR double integrations allowed us to evaluate the quantity of mononuclear Cu(II) (spin 1/2) by comparing it with the EPR response in the same solvent and same temperature of the parent dicationic complex (1, same quantity in the same volume).
  • 39
    • 1642561656 scopus 로고    scopus 로고
    • See refs 16 and 27
    • The geometry of the mononuclear complex, as proposed in Scheme 1, is quite similar to that obtained with Cu(II) and a calixarene-based ligand presenting a phenolate group covalently bound to one of the nitrogenous arm: Sénèque, O.; Campion, M.; Douziech, B.; Giorgi, M.; Le Mest, Y.; Reinaud, O. J. Chem. Soc., Dalton Trans. 2003, 4216-4218. Simple modeling (Dreiding or ChemBats3D) indicates overcongestion around the metal center because of steric interactions with the calixarene core and the methoxy substituents for a hypothetical structure involving simultaneously (i) endo binding of an imidazole and (ii) exo binding of the two other imidazolse + OH + guest. In the dinuclear structure, the Cu(II) ions are bound in the exo position to two imidazole arms belonging to two different calixarenes, which allows for relative steric decongestion. Such a steric constraint due to the macrocycle actually leads to the formation of tri- and tetranuclear species in the presence of extra copper and anions. See refs 16 and 27.
    • (2003) J. Chem. Soc., Dalton Trans. , pp. 4216-4218
    • Sénèque, O.1    Campion, M.2    Douziech, B.3    Giorgi, M.4    Le Mest, Y.5    Reinaud, O.6
  • 40
    • 31044431603 scopus 로고    scopus 로고
    • note
    • Complex 3 could not be isolated as a pure compound; indeed, it is stable only in the presence of excess acetamide. Otherwise, it evolves toward multinuclear acetato-Cu(II) complexes.
  • 41
    • 31044447778 scopus 로고    scopus 로고
    • note
    • -1.
  • 52
    • 0003646266 scopus 로고
    • Société Française de Chimie: Paris
    • (a) Michalowicz, A. Logiciels pour la Chimie; Société Française de Chimie: Paris, 1991; p 102.
    • (1991) Logiciels Pour la Chimie , pp. 102
    • Michalowicz, A.1


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.