Transition metal complexes of pentadentate ligands

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dc.contributor.authorColeman, William Monroe IIIen
dc.contributor.committeechairTaylor, Larry T.en
dc.contributor.committeememberDillard, John G.en
dc.contributor.committeememberMcNair, Harold M.en
dc.contributor.departmentChemistryen
dc.date.accessioned2014-03-14T21:47:32Zen
dc.date.adate2010-10-13en
dc.date.available2014-03-14T21:47:32Zen
dc.date.issued1970-10-15en
dc.date.rdate2010-10-13en
dc.date.sdate2010-10-13en
dc.description.abstractThe investigation of N,N'bis(salicylidene)-1,7-diamino-4-azaheptane, SALLDIPN, N,N'bis(salicylidene)-1,5-diamino-3-azaheptane, SALDIEN, and N,N'bis(salicylidene)-1,5-diamino-3-thiopentanane, SALUAES, as pentadentate ligands is logical in that they offer an analogy to the environment around the cobalt atom in Vitamin B₁₂, I [see Figure I], represented below. These complexes might be expected to give some insight as to the behavior and role of the metal ion as it interacts with the five-donor atoms and hence an insight into the role of the metal ion in Vitamin B₁₂. [See Figure I] Compounds formed by the reaction of Ni(XSAL)₂·2H₂0 with 1,5-diamino-3-azaheptane, DlEN, and Ni(OAc)₂·4H₂O with X-SALDAES were isolated and characterized. In addition to these, alkyl σ-bonded derivatives formed by the reaction of reduced Co(SALDIPN) with R-X were also isolated and characterized. Mass spectra, magnetic moments; X-ray powder patterns, infrared, visible, and near infrared spectra were obtained on the majority of the compounds. Nuclear magnetic resonance spectra were obtained on the majority of the σ-bonded alkyl complexes. It was concluded that the Ni(X-SALDIEN) complexes are square planar whereas the Ni(X-SALDAES) complexes are distorted square planar or possibly a five-coordinate species. Spin state changes were observed for both complexes when they were dissolvea in pyridine which is in contrast to Ni(X-SALEN). The alkyl derivatives were all primary in nature and very stable to light, air, and H₂0 which in contrast to the alkyl derivatives of Co(X-SALEN) which happen to be photolabile. The geometry around the cobalt atom in R-Co-(SALDIPN) was concluded to be pseudo-octahedral. Reasons for certain anomalies (i.e., magnetic moments, etc.) were discussed in detail.en
dc.description.degreeMaster of Scienceen
dc.format.extent78 pages, 2 unnumbered leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-10132010-020018en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-10132010-020018/en
dc.identifier.urihttp://hdl.handle.net/10919/45151en
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1970.C63.pdfen
dc.relation.isformatofOCLC# 20297712en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1970.C63en
dc.subject.lcshLigandsen
dc.subject.lcshTransition metalsen
dc.titleTransition metal complexes of pentadentate ligandsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineChemistryen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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