English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

MgO-supported catalysts were prepared from [HRe(CO)5] and [H,Re3(CO),,] and characterized by extraction of surfaceorganometallics, infrared and ultraviolet/visible spectroscopy, and extended X-ray absorption fine structure (EXAFS)spectroscopy. The EXAFS analysis and other data show that [H,Re,(CO),,] was initially deprotonated on the MgO surface,giving a surface-bound anion with a structure comparable to that of the salt [Ph,As] [H2Re,(C0)12] and having a Re-Mgdistance of 2.39 8,. Heating of the supported cluster anion in helium to 225 OC led to oxidation and breakup of the clusterframework, giving a mononuclear complex formulated as [Re(C0)3(0MgJ3(]w here the braces refer to groups terminatingthe bulk oxide). The distances characterizing the bonding of the Re to the support are Re-O = 2.15 8, and Re-Mg = 2.808,. A Re-Re distance of 3.94 8, was observed, consistent with the decomposition of the cluster on the support to form ensemblesconsisting of three of the Re subcarbonyls, for which a structural model is presented. Treatment of this sample in hydrogenat 350 'C gave a Re species with oxygen neighbors at average distances of 1.94 and 2.45 8,. Heating of this sample to 500OC in hydrogen led to reduction and conversion of most of the Re into metal crystallites. The several samples were testedas catalysts, as described in a companion paper.

the journal of physical chemistry

Surface Catalytic Sites Prepared from [HRe(CO)5] and [H3Re3(CO)12]: Mononuclear, Trinuclear, and Metallic Rhenium Catalysts Supported on MgO