Presentation Title

Synthesis and Spectroscopic Characterization of Chromium Acetylacetonato Complexes

Faculty Mentor

John Kenney

Start Date

17-11-2018 10:00 AM

End Date

17-11-2018 10:15 AM

Location

C327

Session

Oral 2

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

Multiple syntheses were carried out to prepare a series a chromium(III) transition metal complexes formally named tris-(acetylacetonato)chromium(III). Literature procedures were refined and corrected for the syntheses of each of these complexes. Through the process of recrystallization, well-defined crystal structures were collected for Cr(acac)3, Cr(acac-Cln)3, and Cr(acac-Brn)3 where acac = acetylacetonato, Cl = chlorine, and Br = bromine. UV-visible and cryogenic luminescence spectra at 77 K were measured for each of these complexes. UV-visible spectral analysis confirmed the identity of Cr(acac)3, Cr(acac-Cln), and Cr(acac-Brn), and luminescence allowed for quantitative determinations of the 0-0 transition energy and fundamental frequency of the breathing vibrations, which do not currently appear in the scientific literature. Bimetallic chromium(III) complexes were synthesized to have hydroxy and methoxy bridging ligands to connect the two chromium(III) metals.

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Nov 17th, 10:00 AM Nov 17th, 10:15 AM

Synthesis and Spectroscopic Characterization of Chromium Acetylacetonato Complexes

C327

Multiple syntheses were carried out to prepare a series a chromium(III) transition metal complexes formally named tris-(acetylacetonato)chromium(III). Literature procedures were refined and corrected for the syntheses of each of these complexes. Through the process of recrystallization, well-defined crystal structures were collected for Cr(acac)3, Cr(acac-Cln)3, and Cr(acac-Brn)3 where acac = acetylacetonato, Cl = chlorine, and Br = bromine. UV-visible and cryogenic luminescence spectra at 77 K were measured for each of these complexes. UV-visible spectral analysis confirmed the identity of Cr(acac)3, Cr(acac-Cln), and Cr(acac-Brn), and luminescence allowed for quantitative determinations of the 0-0 transition energy and fundamental frequency of the breathing vibrations, which do not currently appear in the scientific literature. Bimetallic chromium(III) complexes were synthesized to have hydroxy and methoxy bridging ligands to connect the two chromium(III) metals.