PHOTOOXIDATION OF HEXACARBONYLMOLYBDENUM(0) IN SODIUM ZEOLITE-Y TO YIELD REDOX-INTERCONVERTIBLE MOLYBDENUM(VI) OXIDE AND MOLYBDENUM(IV) OXIDE MONOMERS

Date

1992-11-01

Author

Özkar, Saim
PROKOPOWICZ, RA

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

68
views

0
downloads

An analysis of the photooxidation reaction of alpha-cage located, site II sodium cation anchored trans(ZONa)...(OC)Mo(CO)4(CO)...(NaOZ) exposed to O2 in sodium zeolite Y (Na56Y) has been carried out using various techniques (PXRD, EXAFS, MAS/DOR-NMR, EPR, XPS, UV-vis, FTIR, gravimetry). The results have shown that it cleanly and qunatitatively converts to molybdenum(VI) oxide and CO2 as the sole reaction products according to n[MO(CO)6]-Na56Y + 9/2nO2 -->(hnu) n[MoO3]-Na56Y + 6nCO2 over the full loading range 0 < n less-than-or-equal-to 16. Vacuum, thermally induced reductive elimination Of O2 from the molybdenum(VI) oxide photoproduct is quantitative at 400-degrees-C and yields molybdenum(IV) oxide with no evidence for any other products having oxygen stoichiometries differing from two and three. This reduction process can be quantitatively reversed by exposure of the molybdenum(IV) oxide product to O2 at 400-degrees-C, according to

Subject Keywords

Materials Chemistry, General Chemistry, General Chemical Engineering

URI

https://hdl.handle.net/11511/48081

Journal

CHEMISTRY OF MATERIALS

DOI

https://doi.org/10.1021/cm00024a046

Collections

Department of Chemistry, Article

Suggestions

OpenMETU
Core

Economic synthesis of quinaldinium fluorochromate(VI), (QnFC), and solvent-free periodic acid oxidation of alcohols catalyzed by QnFC Özdemir, Melek (The Scientific and Technological Research Council of Turkey, 2014-01-01) A 1: 1: 1 stoichiometric reaction between CrO3, aqueous HF, and quinaldine affords orange crystalline quinaldinium fluorochromate(VI) (QnFC) (C10H9NH[CrO3F]) in 99.4% isolated yield. A highly efficient, simple, chemoselective, and environmentally benign procedure for QnFC (3 mol%) catalyzed oxidation of primary and secondary alcohols to aldehydes and ketones using 1.1 equiv of H5IO6 under solvent-free conditions is described.
Polystyrene-b-poly(2-vinyl phenacyl pyridinium) salts as photoinitiators for free radical and cationic polymerizations and their photoinduced molecular associations Taskin, Omer Suat; Erel Göktepe, İrem; Khan, Muhammad Alyaan Ahmed; Pispas, Stergios; Yağcı, Yusuf (Elsevier BV, 2014-07-01) Polystyrene-b-poly(2-vinyl phenacyl pyridinium hexafluorophosphate) (PS-b-PVPP) was synthesized by reacting polystyrene-b-poly(2-vinyl pyridine) prepared by living anionic polymerization with phenacyl bromide followed by counter anion exchange reaction. The ability of PS-b-PVPP to act as a photoinitiator for both free radical and cationic polymerizations is demonstrated. In the free radical polymerization, the initiation step involves the decay of the excited state of the salt with homolytic bond rupture of...
Rhodium(0) nanoparticles supported on nanotitania as highly active catalyst in hydrogen generation from the hydrolysis of ammonia borane Akbayrak, Serdar; Gencturk, Serap; MORKAN, İzzet; Özkar, Saim (Royal Society of Chemistry (RSC), 2014-01-01) Rhodium(0) nanoparticles supported on the surface of titanium dioxide (Rh(0)@TiO2) were in situ generated from the reduction of rhodium(III) ions impregnated on nanotitania during the hydrolysis of ammonia borane. They were isolated from the reaction solution by centrifugation and characterized by a combination of advanced analytical techniques. The results show that (i) highly dispersed rhodium(0) nanoparticles with sizes in the range 1.3-3.8 nm were formed on the surface of titanium dioxide, (ii) Rh(0)@Ti...
Kinetic analysis of DSC and thermogravimetric data on combustion of lignite Kök, Mustafa Verşan (Springer Science and Business Media LLC, 1996-06-01) Thermal analysis increasingly being used to obtain kinetic data relating to sample decomposition. This work involves a comparative study of several methods used to analyse DSC and TG/DTG data obtained on the oxidation of Beypazari lignite. A general computer program was developed and the methods are compared with regard to their accuracy and the ease of interpretation of the kinetics of thermal decomposition. For this study, the ratio method was regarded as the preferred method, because it permits the estim...
Electrochemical investigation of copper-DTPI interactions Hicyilmaz, C; Altun, Naci Emre (Springer Science and Business Media LLC, 2006-05-01) The electrochemical behavior of copper in the absence and presence of a dithiophosphinate type collector, sodium diisobuthyldithiophosphinate (NaDTPI), was determined to investigate the interactions between a copper surface and NaDTPI as a function of pulp potential (Eh) and pH. The electrochemical studies were performed by Cyclic Voltammetry (CV) in the -355 to +1550 mV (SHE) potential range and at different pHs from slightly acidic to strongly alkaline conditions. The electrochemical studies were carried ...

Citation Formats

S. Özkar and R. PROKOPOWICZ, “PHOTOOXIDATION OF HEXACARBONYLMOLYBDENUM(0) IN SODIUM ZEOLITE-Y TO YIELD REDOX-INTERCONVERTIBLE MOLYBDENUM(VI) OXIDE AND MOLYBDENUM(IV) OXIDE MONOMERS,” CHEMISTRY OF MATERIALS, pp. 1380–1388, 1992, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48081.