The polyoxoanion-supported, atomically dispersed transition-metal precatalyst [(1,5-COD)Ir[times]P[sub 2]W[sub 15]Nb[sub 3]O[sub 62]][sup 8[minus]]: Direct [sup 17]O NMR evidence for Ir-ONb[sub 2] bonding and for a C[sub 3] average symmetry, iridium-to-polyoxoanion support
Journal Article
·
· Organometallics; (United States)
- Univ. of Oregon, Eugene (United States)
Selective enrichment with [sup 17]OH[sub 2] followed by [sup 17]O NMR allows observation of just the Nb[sub 3]O[sub 6] support site in the custom-designed polyoxoanion P[sub 2]W[sub 15]Nb[sub 3]O[sub 6][sup 9[minus]] and in the polyoxoanion-supported organometallic precatalyst [(n-C[sub 4]H[sub 9])[sub 4]N][sub 5]Na[sub 3][(1,5-COD)Ir-P[sub 2]W[sub 15]Nb[sub 3]O[sub 62]] (1) without interference from other [sup 17]O NMR resonances. The [sup 17]O NMR results provide direct evidence for Ir-ONb[sub 2] bonding between (1,5-COD)Ir[sub 1][sup +] (1,5-COD = 1,5-cyclooctadiene) and P[sub 2]W[sub 15]Nb[sub 3]O[sub 62][sup 9[minus]] in solution, where catalysis beginning with 1 has been demonstrated. The [sup 17]O NMR results are also definitive in demonstrating that [(1,5-COD)Ir[sup 1]][sup +] is bound in overall average C[sub 3[upsilon]] (pseudo) symmetry to the Nb[sub 3]O[sub 6] minisurface in 1 (pseudo due to the 2-fold axis in 1,5-COD and thus the local C[sub s] symmetry at Ir). 15 refs., 3 figs., 1 tab.
- OSTI ID:
- 6215646
- Journal Information:
- Organometallics; (United States), Journal Name: Organometallics; (United States) Vol. 12:4; ISSN 0276-7333; ISSN ORGND7
- Country of Publication:
- United States
- Language:
- English
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Journal Article
·
Tue Mar 14 23:00:00 EST 1995
· Inorganic Chemistry
·
OSTI ID:451274
Polyoxoanions as soluble metal oxide analogs. Synthesis and characterization of the polyoxoanion-supported iridium(I) complex (1,5-COD)Ir[center dot]SiW[sub 9]Nb[sub 3]O[sub 40][sup 6[minus]]
Journal Article
·
Tue Dec 21 23:00:00 EST 1993
· Inorganic Chemistry; (United States)
·
OSTI ID:5110009
Polyoxoanions as soluble metal oxide analogues. 6. Catalytic activity and initial kinetic and mechanistic studies of polyoxoanion-supported, atomically dispersed iridium(I), (1,5-COD)Ir times P sub 2 W sub 15 Nb sub 3 O sub 62 sup 8 minus
Journal Article
·
Wed May 16 00:00:00 EDT 1990
· Inorganic Chemistry; (USA)
·
OSTI ID:6636869
Related Subjects
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ANIONS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHARGED PARTICLES
IONS
IRIDIUM COMPOUNDS
MAGNETIC RESONANCE
NIOBIUM COMPOUNDS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHOSPHORUS COMPOUNDS
REFRACTORY METAL COMPOUNDS
RESONANCE
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
360601 -- Other Materials-- Preparation & Manufacture
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ANIONS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHARGED PARTICLES
IONS
IRIDIUM COMPOUNDS
MAGNETIC RESONANCE
NIOBIUM COMPOUNDS
NUCLEAR MAGNETIC RESONANCE
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHOSPHORUS COMPOUNDS
REFRACTORY METAL COMPOUNDS
RESONANCE
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS