Presentation Title

Preparation of New Polydentate, Multi-coordinate Ligands for Examining Coordination Chemistry

Faculty Mentor

Dr. Brandon Qillian

Faculty Mentor Email

bquillian@georgiasouthern.edu

Presentation Type and Release Option

Research Poster Presentation with Supplemental Video (File Not Available for Download)

Location

COUR Symposium 2021

Presentation Year

2021

Start Date

4-19-2021 12:00 AM

End Date

April 2021

Abstract

Coordination chemistry is a sub-discipline of chemistry that concerns the study of the binding interactions of organic Lewis Bases with Lewis Acidic metals and the resulting coordination complex. The properties of the metal, including geometry and reactivity, can be controlled by the coordinating organic ligand through changes in its steric and electronic profile. Our current project involves the development of multi-coordinating ligands with the ability to bind to two metals, with various coordination modes. These ligands have promising utility in the development of coordination polymers, catalysis and reaction chemistry. We prepared a new ligand type that possesses two amide functional groups and two sets of bis(pyrazolyl) groups N,N'-(1,2-phenylene)bis(2,2-bis(3,5-dimethyl-1H-pyrazol-1-yl)acetamide) (1) and N,N'-(1,2-phenylene)bis(2,2-bis(1H-pyrazol-1-yl)acetamide) (2). The ligands were prepared by reaction of their respective bis(pyrazolyl)acetyl chloride), prepared from the reaction of their bis(pyrazolyl)acetic acid (BPA) with thionyl chloride, with phenylenediamine. These ligands were characterized by proton and carbon nuclear magnetic resonance, (H-NMR and C-NMR), infrared spectroscopy (IR), and single crystal X-ray crystallography. Interestingly, we also isolated 2-di(1H-pyrazol-1-yl)methyl)-1H-benzo[d]imidazole (3) in low yield due double condensation of the diamine ligand. Ligands 1 and 2 have been reacted with several metals to examine their coordination properties. The modular aspect of this new type of ligand opens the door to the preparation of a vast array of new ligand variants by varying the pyrazole unit and diamine ligand, which could lead to a dramatic change in the properties of metal-ligand complex.

Academic Unit

Department of Chemistry and Biochemistry

This document is currently not available here.

Share

COinS
 
Apr 19th, 12:00 AM Apr 20th, 12:00 AM

Preparation of New Polydentate, Multi-coordinate Ligands for Examining Coordination Chemistry

COUR Symposium 2021

Coordination chemistry is a sub-discipline of chemistry that concerns the study of the binding interactions of organic Lewis Bases with Lewis Acidic metals and the resulting coordination complex. The properties of the metal, including geometry and reactivity, can be controlled by the coordinating organic ligand through changes in its steric and electronic profile. Our current project involves the development of multi-coordinating ligands with the ability to bind to two metals, with various coordination modes. These ligands have promising utility in the development of coordination polymers, catalysis and reaction chemistry. We prepared a new ligand type that possesses two amide functional groups and two sets of bis(pyrazolyl) groups N,N'-(1,2-phenylene)bis(2,2-bis(3,5-dimethyl-1H-pyrazol-1-yl)acetamide) (1) and N,N'-(1,2-phenylene)bis(2,2-bis(1H-pyrazol-1-yl)acetamide) (2). The ligands were prepared by reaction of their respective bis(pyrazolyl)acetyl chloride), prepared from the reaction of their bis(pyrazolyl)acetic acid (BPA) with thionyl chloride, with phenylenediamine. These ligands were characterized by proton and carbon nuclear magnetic resonance, (H-NMR and C-NMR), infrared spectroscopy (IR), and single crystal X-ray crystallography. Interestingly, we also isolated 2-di(1H-pyrazol-1-yl)methyl)-1H-benzo[d]imidazole (3) in low yield due double condensation of the diamine ligand. Ligands 1 and 2 have been reacted with several metals to examine their coordination properties. The modular aspect of this new type of ligand opens the door to the preparation of a vast array of new ligand variants by varying the pyrazole unit and diamine ligand, which could lead to a dramatic change in the properties of metal-ligand complex.