Synthethic pathways to multiple surface functionalization of polyhedral boranes

2019 ◽  
Author(s):  
◽  
Teng-Wei Wang
Keyword(s):  
High Resolution Mass Spectrometry ◽  
Molar Absorptivity ◽  
Quantum Yields ◽  
Direct Reaction ◽  
Close Monitoring ◽  
Fluorescence Excitation ◽  
University Of Missouri ◽  
Product Ions ◽  
Ft Ir ◽  
The University

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] The chemistry of dodecahydro--closo--dodecaborate(2-), closo-[B12H12]2-, and decahydro-closo-decaborate(2-), [B10H10]2-, with different organic substituents was investigated in this research. The previously reported sequential synthesis of closo-[B12H12]2- hydroxyl derivatives were irreproducible. Through close monitoring of time and temperature mono-, di-, and tri- substituted hydroxyl, [B12H12-y(OH)y]2-, was synthesized in a controlled manner at 0.5 g, 5 g, and 10 g scales with significantly improved yields, >86%, 68%, >95%, respectively. Each of the hydroxylated species were exhaustively chlorinated in yields exceeding 95%. Oxidizing the perchlorinated hydroxylated products to the neutral species allows for their solubility in organic solvents, thus, open to easier manipulation in various organic settings and more accessible to perform organic chemistry. The more organic behavior of the cage allows us to synthesize hydroxyl derivatives. closo-[B12H10(SH)2]2- was synthesized from reduction of the inner-sulfonium salt of closo-[B12H10(SMe2)2] to make a suitable candidate for single molecular electronic conductors. An alternative synthetic route was proposed using ethylenediamine and n-propylamine as a great substitute for methylamine in the reaction for the formation of dithiol derivative from 1. A yield of 70% - 75% of the bis-(1,12-thiol)-closo-dodecaborate(2-) and 75% - 83% of bis-(1,7-thiol)-closo-dodecaborate(2-) was reported using this method. Recently, we reported a new class of organic-inorganic hybrid nanomolecular ions designated as polyarylboranes. These polyarylboranes are synthesized from the direct reaction between closo-[B12H12]2-or closo-[B10H10]2- and various aromatic hydrocarbons. The highly fluorescent characteristics of the product ions in solution results in high fluorescent quantum yields (0.3 to 0.6), high molar absorptivity, and large Stokes shifts (>200 nm). All of the newly synthesized compounds have been characterized by FT-IR, multi-nuclei NMR, and high-resolution mass spectrometry. In addition, the absorption, fluorescence excitation and emission properties for many of these materials have been measured.

TEM study of boron additions to cobalt aluminide

1988 ◽  
Vol 46 ◽  
pp. 546-547
Author(s):  
Gerald B. Feldewerth
Keyword(s):  
High Temperature ◽  
Turbine Engines ◽  
Major Drawback ◽  
University Of Missouri ◽  
Specific Strength ◽  
Aerospace Applications ◽  
Wide Range ◽  
Ordered Alloys ◽  
The University ◽  
Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

MARS — Its Tenth Anniversary of Operation and its Future

1980 ◽  
Vol 19 (03) ◽  
pp. 125-132
Author(s):  
G. S. Lodwick ◽  
C. R. Wickizer ◽  
E. Dickhaus
Keyword(s):  
Conceptual Development ◽  
Administrative Support ◽  
Final Section ◽  
Economic Benefits ◽  
Hospital Environment ◽  
Computer Scientist ◽  
University Of Missouri ◽  
Complete Bibliography ◽  
The University ◽  
Economic Considerations

The Missouri Automated Radiology System recently passed its tenth year of clinical operation at the University of Missouri. This article presents the views of a radiologist who has been instrumental in the conceptual development and administrative support of MARS for most of this period, an economist who evaluated MARS from 1972 to 1974 as part of her doctoral dissertation, and a computer scientist who has worked for two years in the development of a Standard MUMPS version of MARS. The first section provides a historical perspective. The second deals with economic considerations of the present MARS system, and suggests those improvements which offer the greatest economic benefits. The final section discusses the new approaches employed in the latest version of MARS, as well as areas for further application in the overall radiology and hospital environment. A complete bibliography on MARS is provided for further reading.

An Interactive Morphological Matrix Computational Design Tool: A Hybrid of Two Methods

2007 ◽  
Author(s):  
Cari R. Bryant ◽  
Matt Bohm ◽  
Robert B. Stone ◽  
Daniel A. McAdams
Keyword(s):  
Computational Design ◽  
Design Tool ◽  
Design Tools ◽  
Concept Generation ◽  
University Of Missouri ◽  
Generation Algorithm ◽  
Design Theories ◽  
The University ◽  
Matrix Generator

This paper builds on previous concept generation techniques explored at the University of Missouri - Rolla and presents an interactive concept generation tool aimed specifically at the early concept generation phase of the design process. Research into automated concept generation design theories led to the creation of two distinct design tools: an automated morphological search that presents a designer with a static matrix of solutions that solve the desired input functionality and a computational concept generation algorithm that presents a designer with a static list of compatible component chains that solve the desired input functionality. The merger of both the automated morphological matrix and concept generation algorithm yields an interactive concept generator that allows the user to select specific solution components while receiving instantaneous feedback on component compatibility. The research presented evaluates the conceptual results from the hybrid morphological matrix approach and compares interactively constructed solutions to those returned by the non-interactive automated morphological matrix generator using a dog food sample packet counter as a case study.

Beyond the border war : student civil rights activism at the University of Kansas and the University of Missouri, 1946-1954

2020 ◽  
Author(s):  
◽  
Mary Beth Brown
Keyword(s):  
World War Ii ◽  
Civil Rights ◽  
Race Relations ◽  
Student Activism ◽  
University Of Kansas ◽  
University Of Missouri ◽  
Effect Change ◽  
Student Activists ◽  
The University ◽  
The 19Th Century

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI-COLUMBIA AT REQUEST OF AUTHOR.] This dissertation examines post-World War II student civil rights activism at two Midwestern college campuses, the University of Missouri (MU) and the University of Kansas (KU). Missouri and Kansas have conflicting histories concerning race dating back to Bleeding Kansas and the history of race relations on the campuses of KU and MU. This history is especially complicated during the period between 1946 and 1954 because of heightened student activism that challenged racial injustices. Race relations on campus largely mirrored that of the state's political environment, with KU having integrated in the 19th century, whereas MU did not desegregate until 1950. However, the same did not apply to the success of student activists at each school where MU students found success fighting against discriminatory practices in Columbia, whereas local business leaders and the university administration stymied KU students. The dissertation examines the exchange of ideas and strategy among students, which occurred through athletics, debates, guest speakers, and various regional and national groups. In particular, the study argues that campus spaces, such as residential co-ops and student organizations, were deeply significant because they served as incubators of activism by offering students a place to talk about racial and social injustice and plan ways to challenge these inequalities and effect change on campus and in the broader community.

Sharp things, or the silver lines are not scars

2019 ◽  
Author(s):  
◽  
Teresa Milbrodt
Keyword(s):  
Financial Stability ◽  
Romantic Relationship ◽  
Insurance Coverage ◽  
Health Insurance Coverage ◽  
Stained Glass ◽  
University Of Missouri ◽  
Adjunct Instructor ◽  
Constant Change ◽  
Part Time ◽  
The University

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] This novel is the story of Tianne, a twenty-eight-year-old stained glass artist. She works two part-time jobs as a clerk at a stained glass supply store, and as an adjunct instructor at a community college. Her boyfriend Jeremiah is an academic adviser at the same college, but wants a career performing in comedy clubs. He uses a wheelchair due to spina bifida, and is cheerfully blunt that he could die from an undetected kidney infection. Tianne wrangles her own invisible disability, since endometriosis causes her to have awful cramps during her period that can keep her home from work. Tianne loves her jobs but worries about bills after her car breaks down. She envies Jeremiah's financial stability until he's fired for speaking his mind too many times to administration. Tianne fears for his health insurance coverage, while Jeremiah debates careers as a high school guidance counselor or touring comedy clubs. Throughout the book Tianne tries to chart a path though the instabilities of her body, Jeremiah's body, their career paths, and their romantic relationship, knowing that nothing is permanent. Hers is a story not of looking for stability, but coming to terms with instability, and finding spaces of adaptation to constant change.

Frobenius closure and prime characteristic singularities

2020 ◽  
Author(s):  
◽  
Kyle Logan Maddox
Keyword(s):  
Local Ring ◽  
Local Cohomology ◽  
Sufficient Condition ◽  
Zariski Topology ◽  
Prime Characteristic ◽  
Joint Work ◽  
University Of Missouri ◽  
Mild Conditions ◽  
Flat Maps ◽  
The University

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] This dissertation outlines several results about prime characteristic singularities for which the nilpotent part under the induced Frobenius action on local cohomology is either finite colength or the entire module, collectively referred to here as nilpotent singularities. First, we establish a sufficient condition for the finiteness of the Frobenius test exponent for a local ring and apply it to conclude that nilpotent singularities have finite Frobenius test exponent. In joint work with Jennifer Kenkel, Thomas Polstra, and Austyn Simpson, we show that under mild conditions nilpotent singularities descend and ascend along faithfully flat maps. Consequently, we then prove that the loci of primes which are weakly F-nilpotent and F-nilpotent are open in the Zariski topology for rings which are either F-finite or essentially of fiiite type over an excellent local ring.

Friends in high places : two essays on the importance of corporate political connections

2015 ◽  
Author(s):  
◽  
Reza Houston
Keyword(s):  
Initial Public Offering ◽  
Political Connections ◽  
Target Firm ◽  
University Of Missouri ◽  
Accounting Performance ◽  
The Public ◽  
Public Offering ◽  
The University ◽  
The Impact ◽  
The Relationship

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] This study is an examination of the relationship between political connections and the undertaking of major firm events. In our first essay, presented in Chapter 3, we examine the impact politically connected appointments have on firm acquisition behavior. Using proxy statements, we create a unique database of politically connected bidders and merger targets. We find that bidders who hire connected individuals to the board or management team are more likely to avoid merger litigation. Connected bidders make more bids after the appointment. These firms also bid on larger targets. We determine there is a positive relation between the control premium and the relative of the target's connections. Connected acquirers have superior post-merger accounting performance, particularly when they acquire a connected target firm. In the second essay, presented in Chapter 4, we examine the relationship between political connections of private firms and the initial public offering process. Using registration statement information, we create a unique database of politically connected IPO firms. We find that political connections are substitutes to high-quality underwriters and big four auditors. Politically connected firms manage earnings more highly upward than non-connected firms prior to the public offering. Politically connected firms also exhibit less underpricing than non-connected firms. Politically connected IPO firms also have superior post-IPO returns relative to non-connected IPO firms.

New soluble 4-(4-formyl-2,6-dimethoxyphenoxy) substituted phthalocyanines: Synthesis, characterization, photophysical and photochemical properties

2021 ◽  
pp. 1-10
Author(s):  
Ibrahim Erden ◽  
Betül Karadoğan ◽  
Fatma Aytan Kılıçarslan ◽  
Göknur Yaşa Atmaca ◽  
Ali Erdoğmuş
Keyword(s):  
Quantum Yield ◽  
Singlet Oxygen ◽  
Fluorescence Quantum Yield ◽  
Metal Ion ◽  
Mass Spectra ◽  
Quantum Yields ◽  
Therapeutic Outcomes ◽  
Ft Ir ◽  
Photochemical Properties ◽  
New Compounds

This work describes the synthesis, spectral and fluorescence properties of bis 4-(4-formyl-2,6-dimethoxyphenoxy) substituted zinc (ZnPc) and magnesium (MgPc) phthalocyanines. The new compounds have been characterized by elemental analysis, UV-Vis, FT-IR, 1H-NMR and mass spectra. Afterward, the effects of including metal ion on the photophysicochemical properties of the complexes were studied in biocompatible solvent DMSO to analyze their potential to use as a photosensitizer in photodynamic therapy (PDT). The fluorescence and singlet oxygen quantum yields were calculated as 0.04–0.15 and 0.70–0.52 for ZnPc and MgPc, respectively. According to the results, MgPc has higher fluorescence quantum yield than ZnPc, while ZnPc has higher singlet oxygen quantum yield than MgPc. The results show that the synthesized complexes can have therapeutic outcomes for cancer treatment.

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