The Chemical Educator
ISSN: 1430-4171 (electronic version)
Abstract Volume 16
(2011) pp 114-115
Linkage Isomerization in Co(III) Complexes Induced by Sunlight. A Second-Year Undergraduate Laboratory Experiment
Julio J. Criado, Juan L. Manzano, Emilio Rodríguez-Fernández*, Raquel Trujillano, and Miguel A. Vicente
Department of Inorganic Chemistry, Faculty of Chemistry,
University of Salamanca, E-37008-Salamanca. Spain, firstname.lastname@example.org
Published: 25 March 2011
Abstract. In this experiment, the easy isomerization from the nitro complex [Co(NO2)(NH3)5]Cl2 to the nitrito isomer [Co(ONO)(NH3)5]Cl2, by exposure to sunlight is reported. The process is also monitored by the changes in the infrared spectra that are associated with the rearrangement of the ligand from the nitro- to the nitrito-isomer. The infrared spectra were supplemented by visible spectra, comparing the solution spectra of pure, freshly-prepared isomer and those of samples irradiated for several periods of time. This is a very useful tool as it allows students to relate color changes to the isomerization of the complex.
Key Words: Laboratories and Demonstrations; inorganic chemistry; cobalt; linkage isomers; hands-on learning; IR spectroscopy; photochemistry; second-year undergraduate; UV-Vis spectroscopy
(*) Corresponding author. (E-mail: email@example.com)
Supporting Materials:Compounds preparation procedure. IR and visible spectra are available (130 KB).