Supramolecular host–guest coordination systems: [(G+)(Me3E)3MII(CN)6]∞ as ion exchangers, where (G+=Me3E, Et4N or stp), (E=Sn or Pb) and (M=Fe or Ru)
1999; Elsevier BV; Volume: 18; Issue: 21 Linguagem: Inglês
10.1016/s0277-5387(99)00176-x
ISSN1873-3719
Autores Tópico(s)Magnetism in coordination complexes
ResumoA number of 3D-coordination polymers, constructed via [dM(CN)6] building blocks and (Me3E) connecting units, have been prepared and characterized by X-ray powder diffraction and different spectroscopic methods. 1-Methyl-4-(4′-R-styryl) or (2′-R-styryl) pyridinium cations (stp) have been successfully encapsulated within the expandable wide channels of the 3D-coordination polymers by tribochemical or ion exchange reactions producing novel molecular composites. Apart from 6, [(4′-OCH3-stp)(Me3Sn)3FeII(CN)6–MeOH]∞ which exhibits thermochromic behaviour, the molecular composites [(stp)x(Me3E)3FeIII1–xFeIIx(CN)6]∞, 1–12 are mixed valence materials exhibiting localized interaction between the mixed valence iron. The results indicated an ion charge transfer interaction between the guest stp-cations and the host matrix. The molecular composites [(stp)(Me3E)3 MII(CN)6]∞, 13–18 are due to the facile readiness of the coordination polymers [(Me3E)4M(CN)6]∞ and [(Et4N)(Me3Sn)3Fe(CN6)]∞ to ion exchange.
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