The Photochemistry of [Co(CN)5X]n- complexes

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dc.contributor.author Kneeland, Diane M.irgaret
dc.date.accessioned 2018-06-29T16:59:04Z
dc.date.available 2018-06-29T16:59:04Z
dc.date.copyright 1991 en_US
dc.date.issued 2018-06-29
dc.identifier.uri https://dspace.library.uvic.ca//handle/1828/9557
dc.description.abstract Irradiation of [special characters omitted] at 313 nm in basic solution at 10°C in the presence of free SCN yields the products [special characters omitted], and [special characters omitted]. Analysis of product distribution was done by HPLC using a [special characters omitted] column and ion pairing reagents with methanol and water as the eluent. The aquation/anation product ratio is independent of X, but depends linearly on the concentration of SCN. A specific ion effect is observed, the aquation/anation ratio showing a correlation with the radius of the cation. The ratio of sulfur to nitrogen thiocyanato product is 10±2, independent of X, concentration of SCN, and cation, but is different that measured in the thermal anation of [special characters omitted] which gives a S/N ratio of 4. A limiting dissociative mechanism is proposed for the photosubstitution, involving a five coordinate intermediate of sufficient kinetic stability to discriminate among entering groups. The constant S/N ratio for the photosubstitution leads to the conclusion that the intermediate formed in the photoreaction is different from that formed in the thermal reaction. Direct anation has been reported previously for aquopentacyanocobaltate, but not for hexacyanocobaltate. Quenching of the emission lifetime of [special characters omitted] in the presence of chloride salts shows the same order of cation assistance with cation radius as observed for the aquation/anation ratio. en_US
dc.language English eng
dc.language.iso en en_US
dc.rights Available to the World Wide Web en_US
dc.subject Coordination compounds en_US
dc.subject Ligands en_US
dc.subject Photochemistry en_US
dc.title The Photochemistry of [Co(CN)5X]n- complexes en_US
dc.type Thesis en_US
dc.contributor.supervisor Kirk, Alexander D.
dc.degree.department Department of Chemistry en_US
dc.degree.level Doctor of Philosophy Ph.D. en_US
dc.description.scholarlevel Graduate en_US

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