Let’s make something colorful and demonstrate Periodic principles! The tetradentate ligand H2SALEN is part of a large family of Schiff Base ligands that have been used successfully to create transition metal complexes for various purposes. Its synthesis is easy and modular, with the opportunity to modify both salicylaldehyde and ethylenediamine. However, there has not been a published systematic study of first-row transition metal complexes of SALEN or its related ligands. The closest study explored photophysical properties of SALEN complexes and their modification by metal ion complexation (J. Phys. Chem C 2013, 117, 16552-16563). This provides an opportunity for a lab class to develop a synthesis method for metal complexation, apply it to a series of TM complexes, and examine the IR, UV-Vis and magentism of resultant complexes for periodic trends. Results of a preliminary study covering SALEN complexes of vanadium through copper will be presented. Unexpected trends were found, providing interest and connection to basic principles discussed in class, including HSAB theory, the spectrochemical series, d-orbital splitting and high spin/low spin complexes’ magnetic behavior.

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Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.