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
License
This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 International License.
Recommended Citation
Lakhi, Jaspreet Singh, "3,5-Bis(3,5-bis(trifluoromethyl)phenyl)pyrazolyl complexes of Coinage Metals" (2018). Chemistry & Biochemistry Theses. 87.
https://mavmatrix.uta.edu/chemistry_theses/87
Comments
Degree granted by The University of Texas at Arlington