Isotopic labelling applied to the infrared spectra of metal complexes

 

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dc.contributor.advisor Thornton, David A en_ZA
dc.contributor.author Engelter, Carola en_ZA
dc.date.accessioned 2016-03-17T07:18:36Z
dc.date.available 2016-03-17T07:18:36Z
dc.date.issued 1977 en_ZA
dc.identifier.citation Engelter, C. 1977. Isotopic labelling applied to the infrared spectra of metal complexes. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17899
dc.description.abstract The infrared spectra of pyridine adducts of first transition series metal(II) acetylacetonates are discussed in relation to the band shifts induced by ¹⁵N-labelling and deuteration of the pyridine ring and by metal ion substitution. ¹⁵N-Labelling aids in establishing the pyridine ring vibrations, while deuteration and metal substitution are more useful in assigning the νM-L frequencies. Results of the isotopic labelling study lead to a revision of previously-reported νM-O and vC---O frequencies. This technique also facilitates assignment of the νM-N vibrations, observed in the region below 200 cm⁻¹. The occurrence of these bands in this spectral region was expected because of the known relative weakness of the M-N bond strength in pyridine adducts. The effects on the spectra resulting from introduction of a variety of substituents into the pyridine ring are discussed on the basis of the electronic effects of the substituents. After allowing for mass effects, electron-withdrawing substituents are found to decrease νNi-N frequencies while electron-releasing substituents exert negligible effect on the νNi-N bands. An opposite trend is, however, observed for the νNi-O bands and is explained. An investigation of a series of aniline and p-toluidine complexes of first transition metal(II) isothiocyanates is reported. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Chemistry en_ZA
dc.subject.other Inorganic Chemistry en_ZA
dc.title Isotopic labelling applied to the infrared spectra of metal complexes en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Chemistry en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Engelter, C. (1977). <i>Isotopic labelling applied to the infrared spectra of metal complexes</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Chemistry. Retrieved from http://hdl.handle.net/11427/17899 en_ZA
dc.identifier.chicagocitation Engelter, Carola. <i>"Isotopic labelling applied to the infrared spectra of metal complexes."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Chemistry, 1977. http://hdl.handle.net/11427/17899 en_ZA
dc.identifier.vancouvercitation Engelter C. Isotopic labelling applied to the infrared spectra of metal complexes. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Chemistry, 1977 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17899 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Engelter, Carola AB - The infrared spectra of pyridine adducts of first transition series metal(II) acetylacetonates are discussed in relation to the band shifts induced by ¹⁵N-labelling and deuteration of the pyridine ring and by metal ion substitution. ¹⁵N-Labelling aids in establishing the pyridine ring vibrations, while deuteration and metal substitution are more useful in assigning the νM-L frequencies. Results of the isotopic labelling study lead to a revision of previously-reported νM-O and vC---O frequencies. This technique also facilitates assignment of the νM-N vibrations, observed in the region below 200 cm⁻¹. The occurrence of these bands in this spectral region was expected because of the known relative weakness of the M-N bond strength in pyridine adducts. The effects on the spectra resulting from introduction of a variety of substituents into the pyridine ring are discussed on the basis of the electronic effects of the substituents. After allowing for mass effects, electron-withdrawing substituents are found to decrease νNi-N frequencies while electron-releasing substituents exert negligible effect on the νNi-N bands. An opposite trend is, however, observed for the νNi-O bands and is explained. An investigation of a series of aniline and p-toluidine complexes of first transition metal(II) isothiocyanates is reported. DA - 1977 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1977 T1 - Isotopic labelling applied to the infrared spectra of metal complexes TI - Isotopic labelling applied to the infrared spectra of metal complexes UR - http://hdl.handle.net/11427/17899 ER - en_ZA


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