Graduate Program
Chemistry
Degree Name
Master of Science (MS)
Semester of Degree Completion
Fall 2022
Thesis Director
Radu F. Semeniuc
Thesis Committee Member
Edward M Treadwell
Thesis Committee Member
Zhiqing Yan
Thesis Committee Member
Hongshan He
Thesis Committee Member
Gopal R. Periyannan
Abstract
π – π Stacking interactions are one of the most important non-covalent inter-molecular forces, which play an important role in the architecture of 1D and 2D networks of supramolecular chemistry. This associative contact involves the attractive interactions of aromatic molecules with each other. To describe and study the strength of the π – π stacking interactions, four new bis(pyrazolyl)ethanamine ligands having different aromatic groups (1-pyrenyl, 1-naphthyl, 2-naphthyl, and 9-anthracenyl) known for their propensity to be involved in π – π stacking interactions were prepared by the reaction of one equivalent of bis(pyrazolyl)ethanamine with one equivalent of the corresponding aromatic aldehyde. One equivalent of these ligands reacted with one equivalent of Re(CO)5Br to give their corresponding metal complexes.
The ligands and their metal complexes were characterized in solution state by 1H NMR and IR spectroscopic methods. To confirm the formation of metal complexes, ESI-mass spectra were taken. DOSY spectra were taken to study π – π stacking and this spectral data suggested that only the 2-naphthyl and 9-anthracenyl ligands were π-stacked, while for the complexes only the 9-anthracenyl and 1-pyrenyl complexes were π-stacked. X-ray diffraction analysis of the 9-anthracene-CH=NCH2CH(pz)2-Re(CO)3Br complex showed a dimer of two Re complexes with π – π stacking. Unfortunately, suitable crystal structures of the remaining complexes and ligands were not obtained.
Recommended Citation
Guduru, Balamani, "A Study of π – π Stacking Interactions in Rhenium Carbonyl Complexes Based on Backbone Functionalized Bis(pyrazolyl)methane Ligands" (2022). Masters Theses. 4965.
https://thekeep.eiu.edu/theses/4965
