SYNTHESIS AND SPECTROSCOPIC STUDIES OF PENTACARBONYLFUMARONITRILE-CHROMIUM(0), PENTACARBONYLFUMARONITRILE-MOLYBDENUM(0), AND PENTACARBONYLFUMARONITRILE-TUNGSTEN(0)

Date

1994-08-01

Author

MOUR, IA
Özkar, Saim
KREITER, CG

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Photolysis of hexacarbonyl-chromium(0), -molybdenum(0), and -tungsten(0) in presence of fumaronitrile yields at room temperature pentacarbonyl-fumaronitrile-chromium(0) (1): molybdenum(0) (2), and -tungsten(0) (3). The complexes were purified by crystallization and characterized by IR and C-13-NMR spectroscopy. The fumaronitrile ligand is bonded to the M(CO)(5) moiety by one nitrile nitrogen atom rather than by the carbon-carbon double bond. In toluene 2 dissociates into fumaronitrile and pentacarbonyl-molybdenum(0), which is stabilized by the solvent. Fumaronitrile and solvated pentacarbonyl-molybdenum(0) exist in solution together with 2 in an equilibrium which lies in favour of the former species.

Subject Keywords

Chromium, Molybdenum, Tungsten, Carbonyl, Fumaronitrile complexes

URI

https://hdl.handle.net/11511/52575

Journal

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES

Collections

Department of Chemistry, Article

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Synthesis and Spectroscopic Studies of Pentacarbonylfumaronitrile-chromium(0),-molybdenum(0), and -tungsten(0) Mour, Ïzzet A.; Özkar, Saim; Kreiter, Cornelius G. (1994-08-01) Photolysis of hexacarbonyl-chromium(0), -molybdenum(0), and -tungsten(0) in presence of fumaronitrile yields at room tem perature pentacarbonyl-fumaronitrile-chromium(0)(1), -molybdenum(0) (2), and -tungsten(O) (3). The complexes were purified by crystallization and characterized by IR and 13C-NMR spectroscopy. The fumaronitrile ligand is bonded to the M(CO)5 moiety by one nitrile nitrogen atom rather than by the carbon-carbon double bond. In toluene 2 dissociates into fumaronitrile and pentacarbonyl-molybd...
Synthesis and Spectroscopic Study of Pentacarbonyl(η2-tetracyanoethylene) Metal(0) Complexes of the Group 6B Elements Mour, Ïzzet A.; Özkar, Saim (1994-05-01) Pentacarbonyl (n2-tetracyanoethylene) metal(O) com plexes o f chrom ium , m olybdenum and tung sten have b een synthesized by the photochem ical reaction o f hexacarbonyl metal(O) with te tra cyanoethylene in tolu en e at room tem perature. TTie com plexes w ere purified by chrom atography and recrystallization, and characterized by UV- visible, IR and 13C N M R spectroscopy. T etra cyanoethylene is sym m etrically bonded to the M (C O )5 unit through its c a rb o n -c a rb o n double bond as an ^ 2-ligand....
Kinetics of the substitution of norbornadiene in tetracarbonyl(norbornadiene)molybdenum(0) by 2,2 '-3-bipyridine Kayran, C; Okan, E (2001-03-01) The kinetics of the thermal substitution of norbornadiene (nbd) by 2,2 ' -bipyridine (2,2 ' bipy) in (CO)(4)Mo(C7H9) was studied by quantitative FT-IR and UV-VIS spectroscopy. The reaction rate exhibits first-order dependence on the concentration of the starting complex, and the observed rate constant depends on the concentration of both leaving nbd and entering 2,2 ' -bipy ligand. The mechanism was found to be consistent with the previously proposed one, where the rate determining step is the cleavage of o...
Reaction of ferrocenylcarbene complexes of Cr, Mo and W with alkynes: Synthesis of ferrocenylcyclobutenones, ferrocenylfurans and ferrocenylketoesters Zora, Metin (Elsevier BV, 2001-07-09) Ferrocenylcarbene complexes of Cr, Mo and W react with alkynes to produce cyclobutenones, furans and/or ketoesters. The reaction is quite sensitive to the substituents of the alkyne, regardless of the identity of the metal. Cyclobutenones are formed only in the reactions of diphenylacetylene, a rare occurrence for metal carbene complexes. Ketoesters are secondary reaction products and result From oxidation of furan derivatives during the course of the reaction and/or silica-gel chromatography.
Preparation and determination of catalytic activities of group 8 and group 9 metal ion-exchanged zeolite y catalysts in decomposition of nitrous oxide to sole nitrogen and oxygen / Edinç Cürdaneli, Pelin; Özkar, Saim; Department of Chemistry (2014) The Group 8 and 9 metal(III) ion-exchanged zeolite were prepared from the ion exchange of metal(III) ions with the extra framework Na+ cations of zeolite Y with a Si/Al ratio of 2.5. They were characterized by using inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The Group 8 and 9 metal(III) ion-exchanged zeolite materials prepared were tested as catalysts in decomposition of nitrous oxide to oxygen and nitrogen. The cat...

Citation Formats

I. MOUR, S. Özkar, and C. KREITER, “SYNTHESIS AND SPECTROSCOPIC STUDIES OF PENTACARBONYLFUMARONITRILE-CHROMIUM(0), PENTACARBONYLFUMARONITRILE-MOLYBDENUM(0), AND PENTACARBONYLFUMARONITRILE-TUNGSTEN(0),” ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES, pp. 1059–1062, 1994, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/52575.