Retelling an Old Tale using Mass Spectrometry Analysis
Poster Number
11B
Format
Poster Presentation
Faculty Mentor Name
Qinliang Zhao
Faculty Mentor Department
Chemistry
Graduate Student Mentor Name
Chao Feng
Graduate Student Mentor Department
Chemistry
Abstract/Artist Statement
The underlying explanation of metal-metal multiple bonds was first fully proposed by Wilkinson and Cotton more than five decades ago. Their study initiated a whole new area of research for complexes with metal-metal interactions. Almost all metal elements in the periodic table have shown that they could form metal-metal bonds. Their fundamental interest and applications in the fields of chemistry, pharmaceutics, and material science have attracted great attention from scientists. Their research, for the first time, proposed that the bond order between two atoms could reach a maximum of 6 in bimetallics whereas the highest bond order in organic compounds has always been known as 3.
One of the archetypal complexes with a quadruple bond is a dimolybdenum complex with each molybdenum at 2+ oxidation state. Its Mo-Mo quadruple bond, which consists of one sigma, two pi and one delta bonds, has been the classical example illustrated in textbook, seminars, and lectures for several decades; however, its mass spectrometry analysis is not yet established. In our research project, dimolybdenum tetraacetate [Mo2(O2CCH3)4] was synthesized by refluxing molybdenum hexacarbonyl under inert condition with acetic anhydride and glacial acetic acid. The dimolybdenum complex has been studied by various ionization techniques in three different Mass Spectrometry instruments. Finally, accurate m/z values of the molecular ion from JEOL DART-AccuTOF demonstrated its high stability due to the strong bonds in between the two metal atoms. The analysis of isotope patterns, while compared to theoretical value, supported the assignment of the molecular formula. The MS analysis of using Varian 320 ESI-MS and Thermo ESI-LTQ is still under the way.
Location
DeRosa University Center, Ballroom
Start Date
28-4-2018 1:00 PM
End Date
28-4-2018 3:00 PM
Retelling an Old Tale using Mass Spectrometry Analysis
DeRosa University Center, Ballroom
The underlying explanation of metal-metal multiple bonds was first fully proposed by Wilkinson and Cotton more than five decades ago. Their study initiated a whole new area of research for complexes with metal-metal interactions. Almost all metal elements in the periodic table have shown that they could form metal-metal bonds. Their fundamental interest and applications in the fields of chemistry, pharmaceutics, and material science have attracted great attention from scientists. Their research, for the first time, proposed that the bond order between two atoms could reach a maximum of 6 in bimetallics whereas the highest bond order in organic compounds has always been known as 3.
One of the archetypal complexes with a quadruple bond is a dimolybdenum complex with each molybdenum at 2+ oxidation state. Its Mo-Mo quadruple bond, which consists of one sigma, two pi and one delta bonds, has been the classical example illustrated in textbook, seminars, and lectures for several decades; however, its mass spectrometry analysis is not yet established. In our research project, dimolybdenum tetraacetate [Mo2(O2CCH3)4] was synthesized by refluxing molybdenum hexacarbonyl under inert condition with acetic anhydride and glacial acetic acid. The dimolybdenum complex has been studied by various ionization techniques in three different Mass Spectrometry instruments. Finally, accurate m/z values of the molecular ion from JEOL DART-AccuTOF demonstrated its high stability due to the strong bonds in between the two metal atoms. The analysis of isotope patterns, while compared to theoretical value, supported the assignment of the molecular formula. The MS analysis of using Varian 320 ESI-MS and Thermo ESI-LTQ is still under the way.