Show simple item record

dc.contributor.authorKanippayoor, Raveendran K.en_US
dc.date.accessioned2009-07-09T18:39:14Z
dc.date.available2009-07-09T18:39:14Z
dc.date.issued1979-07-09T18:39:14Z
dc.identifier.urihttp://hdl.handle.net/10464/1977
dc.description.abstractSystems such as MF/diol (M = alkali metal) and }1F/carboxylic acid were subjected to IH, I9F and 13C nmr study to investigate the nature of the very strong H-bonding of fluoride ions with these systems. Evidence indicates a strong H-bond in diol-fluoride systems (~H ~ -(56) kJ mol-I) which is stronger than most 'typical' H-bonds (~H = -(12-40) kJ mol-I), but weaker than that reported for carboxylic acid-fluoride systems (~H ~ -(120) kJ mol-I). Approximate fluoride H-bonded shifts (o(OH)OHF) were evaluated for MF/diol systems from IH chemical shift measurements. No direct correlation was observed between I9F chemical shift and H-bond strength. Thermodynamic parameters were calculated from temperature dependent IH and 19F shifts. Preliminary studies of BUn 4NF-acetylacetone by I9F nmr were conducted at low temperatures and a possible Jmax (ca. 400 Hz) is reported for the fluoride ion H-bonded to acetylacetone. Highfield shift for non-protonated carbons and downfield shift for protonated carbons were observed in carboxylic acid/KF systems. Significant decreas$in I3C TI due to strong H-bonding to fluoride ions were also detected in both diol and carboxylic acid systems. Anomalous results were obtained, such as increasing NOE with increasing temperature in neat 1,2-ethanediol (values above the theoretical maximum of 1.988) and in 1,2-ethanediol/KF. The large 13C NOE's for carboxy carbons in neat carboxylic acids which are. further enhanced by the addition of KF are also unusual.en_US
dc.language.isoengen_US
dc.publisherBrock Universityen_US
dc.subjectHydrogen bonding.en_US
dc.subjectFluorides.en_US
dc.subjectIons.en_US
dc.subjectNuclear magnetic resonance spectroscopy.en_US
dc.titleNMR studies of strong hydrogen bond to fluoride ionen_US
dc.typeElectronic Thesis or Dissertationen
dc.degree.nameM.Sc. Chemistryen_US
dc.degree.levelMastersen_US
dc.contributor.departmentDepartment of Chemistryen_US
dc.degree.disciplineFaculty of Mathematics and Scienceen_US
refterms.dateFOA2021-08-07T02:36:52Z


Files in this item

Thumbnail
Name:
Brock_Kanippayoor_Raveendran_1 ...
Size:
3.230Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record