Title

Retelling an Old Tale using Mass Spectrometry Analysis

Poster Number

11B

Lead Author Major

Biochemistry

Lead Author Status

Sophomore

Format

Poster Presentation

Faculty Mentor Name

Qinliang Zhao

Faculty Mentor Email

qzhao@pacific.edu

Faculty Mentor Department

Chemistry

Graduate Student Mentor Name

Chao Feng

Graduate Student Mentor Email

c_feng1@u.pacific.edu

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

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Apr 28th, 1:00 PM Apr 28th, 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.