Recent advances in organometallic alkane and noble gas complexes

2009 ◽  
Vol 81 (9) ◽  
pp. 1667-1675 ◽  
Author(s):  
James A. Calladine ◽  
Khuong Q. Vuong ◽  
Xue Z. Sun ◽  
Michael W. George
Keyword(s):  
Nmr Spectroscopy ◽  
Room Temperature ◽  
Noble Gas ◽  
Metal Carbonyl ◽  
Fast Time ◽  
Time Resolved ◽  
New Approach ◽  
Metal Centers ◽  
Wide Range ◽  
Metal Ligand

Fast time-resolved infrared (TRIR) spectroscopy has been useful for studying the reactions of a wide range of organometallic alkane and noble gas complexes at ambient temperature following irradiation of metal carbonyl precursor complexes. The reactivity of organometallic alkane and xenon complexes decreases both across and down groups V, VI, and VII, and for a given metal/ligand combination the alkane and xenon complexes have similar reactivities. Systematic studies of reactivity have produced long-lived Re complexes which have allowed such complexes to be characterized using NMR spectroscopy. A new approach using liquid propane at low temperature as a solvent to monitor the interaction of such weakly coordinating ligands with transition-metal centers is outlined. TRIR studies monitoring the coordination and activation of methane and ethane in supercritical methane and liquid ethane solvents at room temperature are also reviewed.

scholarly journals Time-Resolved Infrared Spectroscopy in Supercritical Fluids

1999 ◽  
Vol 19 (1-4) ◽  
pp. 133-139 ◽  
Author(s):  
Michael W. George ◽  
Martyn Poliakoff ◽  
Xue-Zhong Sun ◽  
David C. Grills
Keyword(s):  
Infrared Spectroscopy ◽  
Supercritical Fluids ◽  
Room Temperature ◽  
Noble Gas ◽  
Fast Time ◽  
Metal Carbonyls ◽  
Time Resolved ◽  
Organometallic Reactions ◽  
Time Resolved Infrared Spectroscopy ◽  
First Time

We have used fast Time-resolved Infrared Spectroscopy (TRIR) to probe organometallic reactions in supercritical fluids on the nanosecond time-scale. This has allowed us to identify, for the first time in solution at room temperature, organometallic noble gas complexes which are formed following irradiation of metal carbonyls in supercritical noble gas solution. We have found that these complexes are surprisingly stable and have comparable reactivity to organometallic alkane complexes. We have also studied the coordination of CO2 to metal centres in supercritical CO2 (scCO2) and provide the first evidence for the formation and reactivity of ɳ1-O bound metal CO2 complexes in solution at or above room temperature.

Organometallic alkane and noble-gas complexes in conventional and supercritical fluids

2001 ◽  
Vol 73 (3) ◽  
pp. 443-447 ◽  
Author(s):  
Gavin I. Childs ◽  
David C. Grills ◽  
Xue Z. Sun ◽  
Michael W. George
Keyword(s):  
Ambient Temperature ◽  
Supercritical Fluids ◽  
Noble Gas ◽  
Fast Time ◽  
Time Resolved ◽  
Wide Range

Fast time-resolved infrared (TRIR) spectroscopy has been used to study a wide range of organometallic alkane and noble-gas complexes at ambient temperature. We have shown that the reactivity of the n-heptane complexes decreases both across and down Groups V, VI, and VII, and that the corresponding xenon complexes have similar reactivities.

scholarly journals Approach of Serial Crystallography

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 854
Author(s):  
Ki Hyun Nam
Keyword(s):  
Radiation Damage ◽  
Room Temperature ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Crystallography ◽  
The Past ◽  
Wide Range ◽  
Experimental Limitation ◽  
Serial Crystallography ◽  
Collection Strategies

Radiation damage and cryogenic sample environment are an experimental limitation observed in the traditional X-ray crystallography technique. However, the serial crystallography (SX) technique not only helps to determine structures at room temperature with minimal radiation damage, but it is also a useful tool for profound understanding of macromolecules. Moreover, it is a new tool for time-resolved studies. Over the past 10 years, various sample delivery techniques and data collection strategies have been developed in the SX field. It also has a wide range of applications in instruments ranging from the X-ray free electron laser (XFEL) facility to synchrotrons. The importance of the various approaches in terms of the experimental techniques and a brief review of the research carried out in the field of SX has been highlighted in this editorial.

Synthesis and Spectroscopic Study of Pentacarbonyl(η2-tetracyanoethylene) Metal(0) Complexes of the Group 6 B Elements

1994 ◽  
Vol 49 (5) ◽  
pp. 717-720 ◽  
Author(s):  
İzzet A. Mour ◽  
Saim Özkar
Keyword(s):  
Double Bond ◽  
Nmr Spectroscopy ◽  
Spectroscopic Study ◽  
Spectral Data ◽  
Photochemical Reaction ◽  
Room Temperature ◽  
Carbon Double Bond ◽  
Uv Visible ◽  
Metal Ligand ◽  
C Nmr

Pentacarbonyl(η2-tetracyanoethylene) metal(0) complexes of chromium, molybdenum and tung­sten have been synthesized by the photochemical reaction of hexacarbonyl metal(o) with tetra- cyanoethylene in toluene at room temperature. The complexes were purified by chromatography and recrystallization, and characterized by UV- visible, IR and 13C NMR spectroscopy. Tetra- cyanoethylene is symmetrically bonded to the M(CO)5 unit through its carbon-carbon double bond as an η2-ligand. The spectral data are dis­cussed in terms of the metal → ligand π inter­action.

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