ORCID Identifier(s)

0000-0001-9167-0883

Graduation Semester and Year

2018

Language

English

Document Type

Thesis

Degree Name

Master of Science in Chemistry

Department

Chemistry and Biochemistry

First Advisor

Rasika Dias

Second Advisor

Frank Foss

Abstract

Pyrazoles are an important class of five membered heterocyclic compounds consisting of two nitrogen atoms. Pyrazolate anions serve as useful ligands in coordination chemistry. When fluorinated substituents are attached to this ligand they provide favorable properties such as volatility, thermal and oxidative stability. Trinuclear pyrazolate complexes of monovalent coinage metals (i.e., Cu(I), Ag(I), and Au(I)) represent an important class of compounds with interesting structures and fascinating properties. Little has been done in adding sterically hindered substituents onto the pyrazole ring. This thesis includes the introduction of heavily fluorinated bulky aryl substituents such as 3,5-(CF3)2Ph- at the 3- and 5- position of the pyrazole ring resulting in the synthesis of [3,5-(3,5-(CF3)2Ph)2PzH] as a novel pyrazole. The trinuclear metal pyrazolate complexes of monovalent coinage metals like Cu(I), Ag(I), and Au(I) of this pyrazole were also synthesized and it was found that the metal complexes of this pyrazole showed luminescence properties as were exhibited by most of the previously reported metal pyrazolate complexes. The frozen solutions of metal complexes of this pyrazolate shows bright luminescence upon exposure to UV radiation. The frozen solutions of {[3,5-(3,5-(CF3)2Ph)2Pz]Cu}3 and {[3,5-(3,5-(CF3)2Ph)2Pz]Ag}3 complex showed light green colored emission at 77 K whereas {[3,5-(3,5-(CF3)2Ph)2Pz]Au}3 showed bright blue colored emission when irradiated under long wavelength UV radiation (366 nm). Due to the bright luminescence of {[3,5-(3,5-(CF3)2Ph)2Pz]Au}3 , it may serve as a promising candidate for light emitting device applications.

Keywords

pyrazole, metal pyrazolate

Disciplines

Chemistry | Physical Sciences and Mathematics

Comments

Degree granted by The University of Texas at Arlington

Included in

Chemistry Commons

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