ANALOG OF SURFACE MOLYBDENYL ION IN MO-SIO2 SUPPORTED CATALYSTS - ISOPOLYANION MO6O-19(3)- STUDIED BY EPR AND UV-VISIBLE SPECTROSCOPY - COMPARISON WITH OTHER MOLYBDENYL COMPOUNDS

被引：203

作者：

CHE, M ^{[1
]}

FOURNIER, M ^{[1
]}

LAUNAY, JP ^{[1
]}

机构：

[1] UNIV PARIS 06, CHIM METAUX TRANSIT LAB, EQUIPE RECH 608, F-75230 PARIS 05, FRANCE

来源：

JOURNAL OF CHEMICAL PHYSICS | 1979年 / 71卷 / 04期

关键词：

D O I：

10.1063/1.438549

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Electrochemical reduction of the isopolyanion Mo6O 192- in solution leads to X-band EPR spectra at 77 K characterized by g⊥=1.930, g∥=1.919, A⊥=34.5 and A∥=80.5 G. The magnetic parameters were confirmed using a Q-band spectrometer. The EPR spectra are attributed to localized molybdenyl (Mo=0)3+ species surrounded by oxide ions in C4v symmetry with one short Mo-O bond. The magnitude of the g components g ⊥>g∥ confirms the earlier assignment made for reduced Mo/SiO2 supported catalysts where a similar type of molybdenyl Mo(V) species was found to be present on the surface. The magnetic parameters are discussed and compared with those obtained for other oxomolybdenum ions in the frame of the LCAO-MO theory. © 1979 American Institute of Physics.

引用

页码：1954 / 1960

页数：7

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