A novel series of vanadium-sulfite polyoxometalates: synthesis, structural, and physical studies
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Ημερομηνία
Συγγραφείς
Miras, H. N.
Raptis, R. G.
Lalioti, N.
Sigalas, M. P.
Baran, P.
Kabanos, T. A.
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Εκδότης
Wiley-VCH Verlag
Περίληψη
Τύπος
Είδος δημοσίευσης σε συνέδριο
Είδος περιοδικού
peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Chemistry-a European Journal
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Έκδοση βιβλίου
Συμπληρωματικός/δευτερεύων τίτλος
Περιγραφή
Reaction of NH4VO3 with sulfur dioxide affords the hexanuclear cluster (NH4)(2)(Et4N)[((VO)-O-IV)(6)(mu(4)-O)(2)(mu(3)-OH)(2)(mu(3)-SO3)(4)(H2O)(2)]Cl center dot H2O (1), and the decapentanuclear host-guest compound (Et4N)(5){Cl subset of[(VO)(15)(mu(3)-O)(18)(mu-O)(3)]}center dot 3H(2)O (2). Sequential addition of magnesium oxide to an acidic aqueous solution of NH4VO3 (pH approximate to 0) followed by (NH4)(2)SO3 resulted in the formation of either the non-oxo polymeric vanadium(IV) compound trans-(NH4)(2)[V-IV(OH)(2)(mu-SO3)(2)] (3) or the polymeric oxovanadium(IV) sulfite (NH4)[(VO)-O-IV-(SO3)(1.5)(H2O)]center dot 2.5 H2O (4) at pH values of 6 and 4, respectively. The decameric vanadium(v) compound {Na-4(mu-H2O)(8)(H2O)(6)} [Mg(H2O)(6)][V-10(V)(O)(8)(mu(6)-O)(2)(mu(3)-O)(14)]center dot 3H(2)O (5) was synthesised by treating an acidic aqueous solution of NH4VO3 with MgO and addition of NaOH to pH approximate to 6. All the compounds were characterised by single-crystal Xray structure analysis. The crystal structure of compound I revealed an unprecedented structural motif of a cubane unit [M-4(mu(4)-O)(2)(mu 3-OH)(2)] connected to two other metal atoms. Compound 3 comprises a rare example of a non-oxo vanadium(IV) species isolated from aqueous solution and in the presence of the reducing agent SO32-, while compound 4 represents a rare example of an open-framework species isolated at room temperature (20 degrees C). In addition to the synthesis and crystallographic studies, we report the IR and magnetic properties (for 1, 2 and 3) of these vanadium clusters as well as theoretical studies on compound 3.
Περιγραφή
Λέξεις-κλειδιά
density functional calculations, polyoxometalates, structure elucidation, sulfites, vanadium, state coordination chemistry, structure-reactivity relationships, secondary building units, solid-state, magnetic-properties, alkylammonium molybdates, hydrothermal syntheses, self-organization, crystal-structure, sulfur-dioxide
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<Go to ISI>://000228412500004
http://onlinelibrary.wiley.com/store/10.1002/chem.200400203/asset/2295_ftp.pdf?v=1&t=h0dvuzfp&s=cac28920970d418377433c0a88642538c6c08088
http://onlinelibrary.wiley.com/store/10.1002/chem.200400203/asset/2295_ftp.pdf?v=1&t=h0dvuzfp&s=cac28920970d418377433c0a88642538c6c08088
Γλώσσα
en
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Όνομα επιβλέποντος
Εξεταστική επιτροπή
Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας