Please use this identifier to cite or link to this item: http://hdl.handle.net/10773/18214
Title: Synthesis and properties of new materials with cobalt(II), iron(III) and manganese(III)-substituted Keggin polyoxotungstates and 1-alkyl-3-methylimidazolium cations
Author: Santos, Filipe M
Brandao, Paula
Felix, Vitor
Nogueira, Helena I S
Cavaleiro, Ana M V
Keywords: Polyoxometalates
Heteropolytungstates
Metal-substituted Keggin anions
1-Alkyl-3-methylimidazolium
Organic-inorganic hybrids
Issue Date: 2015
Publisher: Elsevier
Abstract: Several novel compounds with 1 alkyl 3 methylimidazolium cations (alkyl butyl and octyl) and first row transition metal substituted Keggin polyoxoanions were synthesised, having the general formula (cation)m[PW11O39M(H2O)] xH2O or (cation)m 1H[PW11O39M(H2O)] xH2O, M Co, Fe, Mn and m anion charge. All compounds were characterized by spectroscopic and analytical techniques. These studies indi cated that both the polyoxometalates and the cations are present in the solids without major alterations. Cyclic voltammetry studies were performed for compounds with 1 butyl 3 methylimidazolium. Disregarding the loss of crystallization or coordinated water, the compounds were found to be stable up to near 300 C. The onset of the decomposition of the organic cations, as determined by thermo gravimetry, occurred in the 300 350 C range. The metal substituted polyoxoanions are stable up to around 300 C, but after this temperature the anions transform into the parent [PW12O40]3 anion, with loss of the substituting metal. Final decomposition to a mixture of oxides occurred only above 600 C. It was also possible to obtain the crystalline compounds Na2K(Bmim)2[PW11O39Co(H2O)] 7.5H2O and Na(Bmim)4[PW11O39Co(H2O)] 2H2O and determine their structures by single crystal X ray diffraction
Peer review: yes
URI: http://hdl.handle.net/10773/18214
DOI: 10.1016/j.poly.2015.07.032
ISSN: 1873-3719
Appears in Collections:CICECO - Artigos



FacebookTwitterLinkedIn
Formato BibTex MendeleyEndnote Degois 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.