SwePub
Sök i LIBRIS databas

  Utökad sökning

L773:0002 9599 OR L773:1945 452X
 

Sökning: L773:0002 9599 OR L773:1945 452X > (2008) > Adding reactivity t...

  • Villa, Eric M. (författare)

Adding reactivity to structure-reaction dynamics in a nanometer-size oxide ion in water

  • Artikel/kapitelEngelska2008

Förlag, utgivningsår, omfång ...

  • American Journal of Science (AJS),2008
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:umu-129149
  • https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-129149URI
  • https://doi.org/10.2475/08.2008.03DOI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • We examine oxygen-isotope exchanges in a nanometer-size oxide molecule in water and, separately, both its rates of dissociation and molecular products. This molecule, the decaniobate ion ([H(x),Nb(10)O(28)]((6-x)-)), is at the same size scale as geochemically interesting features on minerals, such as surface polymers and kink sites on growth steps, although it is structurally quite dissimilar. Unlike mineral surface structures, however, we have complete confidence in the aqueous structure of this molecule and it yields a clear spectroscopic signature as it reacts. We thus can follow proton-enhanced isotope exchanges and base-induced dissociation in unprecedented detail and clarity. The results are surprising and require new thinking about geochemical reactions at the molecular scale. For example, base-induced dissociation of the molecule, which is unprotonated, causes rates of oxygen-isotope exchanges of all structural oxygens to accelerate dramatically. Similarly, protonation of the molecule causes sets of oxygens to react, although protonation is limited. In general, all reactions are via concerted motions of many atoms and the reactivities vary as though the entire structure was responding to changes in solution composition. The site reactivities could not be inferred from the stable structure of the decaniobate molecule because so much of the structure is involved in each exchange event. Thus, computational models must be structurally faithful to an extraordinary degree, and inherently dynamic, or they will miss the essential chemistry.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Ohlin, C. Andre (författare)
  • Balogh, Edina (författare)
  • Anderson, Travis M. (författare)
  • Nyman, May D. (författare)
  • Casey, William H. (författare)

Sammanhörande titlar

  • Ingår i:American Journal of Science: American Journal of Science (AJS)308:8, s. 942-9530002-95991945-452X

Internetlänk

Hitta via bibliotek

Till lärosätets databas

Sök utanför SwePub

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy