Presentation Title

Synthesis of Copper (II) Pincer Complexes with an Amino-Acid Based N-Heterocyclic Carbene Ligand

Faculty Mentor

Jennifer Young

Start Date

18-11-2017 12:30 PM

End Date

18-11-2017 1:30 PM

Location

BSC-Ursa Minor 146

Session

Poster 2

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

Synthesis of Copper(II) Pincer Complexes with an Amino-Acid Based N-Heterocyclic Carbene Ligand

Victoria Carpio and Dr. Jennifer Young, Azusa Pacific University, Department of Biology and Chemistry, 701 E Foothill Blvd, Azusa, CA 91702

In this study, copper(II) pincer complexes were attempted with the use of a glycine-derived N-heterocyclic carbene ligand and pyridine, with the goal of making a coordinate compound that is water-soluble and air-stable. Following literature procedures, glycine imidazolium salt was synthesized with glycine, glyoxal, and formaldehyde. In order to bind the ligand to the transition metal, it was deprotonated by sodium hydroxide dissolved in methanol. In an attempt to bind the ligand to the copper and form a stable complex, the ligand was mixed with CuCl2•2H2O dissolved in pyridine. This resulted in a dark green solid, complex 1. In a different attempt, the ligand was deprotonated by adding excess potassium carbonate dissolved in methanol. This was mixed with CuCl2•2H2O dissolved in pyridine, which resulted in an aqua blue solid, complex 2. Preliminary results indicated that copper(II) hydroxide was formed, so a further synthesis attempt involved the removal of excess water. The procedure resulting in complex 1 was repeated, but the ligand deprotonation mixture was dried over sodium sulfate before being mixed with anhydrous CuCl2 dissolved in pyridine. This resulted in a teal solid, complex 3. IR data and color changes were observed and suggested that different copper(II) complexes were formed. Future work will involve further characterization of the synthesized products using UV-VIS spectroscopy.

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Nov 18th, 12:30 PM Nov 18th, 1:30 PM

Synthesis of Copper (II) Pincer Complexes with an Amino-Acid Based N-Heterocyclic Carbene Ligand

BSC-Ursa Minor 146

Synthesis of Copper(II) Pincer Complexes with an Amino-Acid Based N-Heterocyclic Carbene Ligand

Victoria Carpio and Dr. Jennifer Young, Azusa Pacific University, Department of Biology and Chemistry, 701 E Foothill Blvd, Azusa, CA 91702

In this study, copper(II) pincer complexes were attempted with the use of a glycine-derived N-heterocyclic carbene ligand and pyridine, with the goal of making a coordinate compound that is water-soluble and air-stable. Following literature procedures, glycine imidazolium salt was synthesized with glycine, glyoxal, and formaldehyde. In order to bind the ligand to the transition metal, it was deprotonated by sodium hydroxide dissolved in methanol. In an attempt to bind the ligand to the copper and form a stable complex, the ligand was mixed with CuCl2•2H2O dissolved in pyridine. This resulted in a dark green solid, complex 1. In a different attempt, the ligand was deprotonated by adding excess potassium carbonate dissolved in methanol. This was mixed with CuCl2•2H2O dissolved in pyridine, which resulted in an aqua blue solid, complex 2. Preliminary results indicated that copper(II) hydroxide was formed, so a further synthesis attempt involved the removal of excess water. The procedure resulting in complex 1 was repeated, but the ligand deprotonation mixture was dried over sodium sulfate before being mixed with anhydrous CuCl2 dissolved in pyridine. This resulted in a teal solid, complex 3. IR data and color changes were observed and suggested that different copper(II) complexes were formed. Future work will involve further characterization of the synthesized products using UV-VIS spectroscopy.