Synthesis and characterization of redox-active tris(pyrazolyl)borate cobalt complexesCCDC reference numbers CCDC 699940 and 699941. For crystallographic data in CIF or other electronic format see DOI: 10.1039/b815001j.
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| Title: | Synthesis and characterization of redox-active tris(pyrazolyl)borate cobalt complexesCCDC reference numbers CCDC 699940 and 699941. For crystallographic data in CIF or other electronic format see DOI: 10.1039/b815001j. |
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| Authors: | David J. Harding1, Phimphaka Harding1, Rathawat Daengngern1, Saranphong Yimklan2, Harry Adams2 |
| Source: | Dalton Transactions: An International Journal of Inorganic Chemistry. Feb2009, Vol. 2009 Issue 8, p1314-1320. 7p. |
| Subjects: | Complex compounds synthesis, Oxidation-reduction reaction, Cobalt compounds, Crystallography, Chemical reactions, Tetrahydrofuran, Thiocyanates |
| Abstract: | The reaction of CoX2(X = Cl, Br, NO3) with KTpPh2in tetrahydrofuran (THF) yields the half-sandwich compounds [TpPh2CoX] (X = Cl 1, Br 2, NO33). The reaction of [TpPh2CoBr] with NaX (X = N3, NO2) or potassium thiocyanate (KNCS) permits isolation of [TpPh2CoX] (X = N34, NCS 5, NO26). In contrast, the reaction of cobalt(ii) acetate with KTpPh2yields [TpPh2Co(OAc)(HpzPh2)] 7as a result of B–N bond cleavage. Subsequent reaction of 7with a range of β-diketones in the presence of NaOMe produces the β-diketonate complexes, [TpPh2Co(β-diketonate)] (β-diketonate = acac 8, hfac 9, dbm 10, tmhd 11). IR spectroscopy suggests that the TpPh2ligands are κ3-coordinated and that the β-diketonate ligands adopt a bidentate coordination mode. Electronic spectra are consistent with four- or five-coordinate species in solution. X-Ray crystallographic studies of 7reveal an intermediate five-coordinate cobalt centre with a hydrogen bonding interaction between the pyrazole hydrogen and the acetate carbonyl oxygen. The molecular structures of 9and 10show cobalt centres with square pyramidal coordination geometries and κ2-coordinated β-diketonate ligands. Cyclic voltammetric studies of 6reveal irreversible one-electron reduction to Co(i). However, the β-diketonate complexes, 8, 10and 11undergo irreversible one-electron oxidation.The redox potential and reversibility increases as the steric bulk of the substituent on the β-diketonate ligand increases. [ABSTRACT FROM AUTHOR] |
| Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 36451984 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Synthesis and characterization of redox-active tris(pyrazolyl)borate cobalt complexesCCDC reference numbers CCDC 699940 and 699941. For crystallographic data in CIF or other electronic format see DOI: 10.1039/b815001j. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22David+J%2E+Harding%22">David J. Harding</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Phimphaka+Harding%22">Phimphaka Harding</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Rathawat+Daengngern%22">Rathawat Daengngern</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Saranphong+Yimklan%22">Saranphong Yimklan</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Harry+Adams%22">Harry Adams</searchLink><relatesTo>2</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Dalton+Transactions%3A+An+International+Journal+of+Inorganic+Chemistry%22">Dalton Transactions: An International Journal of Inorganic Chemistry</searchLink>. Feb2009, Vol. 2009 Issue 8, p1314-1320. 7p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Complex+compounds+synthesis%22">Complex compounds synthesis</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br /><searchLink fieldCode="DE" term="%22Cobalt+compounds%22">Cobalt compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Crystallography%22">Crystallography</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+reactions%22">Chemical reactions</searchLink><br /><searchLink fieldCode="DE" term="%22Tetrahydrofuran%22">Tetrahydrofuran</searchLink><br /><searchLink fieldCode="DE" term="%22Thiocyanates%22">Thiocyanates</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The reaction of CoX2(X = Cl, Br, NO3) with KTpPh2in tetrahydrofuran (THF) yields the half-sandwich compounds [TpPh2CoX] (X = Cl 1, Br 2, NO33). The reaction of [TpPh2CoBr] with NaX (X = N3, NO2) or potassium thiocyanate (KNCS) permits isolation of [TpPh2CoX] (X = N34, NCS 5, NO26). In contrast, the reaction of cobalt(ii) acetate with KTpPh2yields [TpPh2Co(OAc)(HpzPh2)] 7as a result of B–N bond cleavage. Subsequent reaction of 7with a range of β-diketones in the presence of NaOMe produces the β-diketonate complexes, [TpPh2Co(β-diketonate)] (β-diketonate = acac 8, hfac 9, dbm 10, tmhd 11). IR spectroscopy suggests that the TpPh2ligands are κ3-coordinated and that the β-diketonate ligands adopt a bidentate coordination mode. Electronic spectra are consistent with four- or five-coordinate species in solution. X-Ray crystallographic studies of 7reveal an intermediate five-coordinate cobalt centre with a hydrogen bonding interaction between the pyrazole hydrogen and the acetate carbonyl oxygen. The molecular structures of 9and 10show cobalt centres with square pyramidal coordination geometries and κ2-coordinated β-diketonate ligands. Cyclic voltammetric studies of 6reveal irreversible one-electron reduction to Co(i). However, the β-diketonate complexes, 8, 10and 11undergo irreversible one-electron oxidation.The redox potential and reversibility increases as the steric bulk of the substituent on the β-diketonate ligand increases. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Dalton Transactions: An International Journal of Inorganic Chemistry is the property of Royal Society of Chemistry and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1039/b815001j Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 1314 Subjects: – SubjectFull: Complex compounds synthesis Type: general – SubjectFull: Oxidation-reduction reaction Type: general – SubjectFull: Cobalt compounds Type: general – SubjectFull: Crystallography Type: general – SubjectFull: Chemical reactions Type: general – SubjectFull: Tetrahydrofuran Type: general – SubjectFull: Thiocyanates Type: general Titles: – TitleFull: Synthesis and characterization of redox-active tris(pyrazolyl)borate cobalt complexesCCDC reference numbers CCDC 699940 and 699941. For crystallographic data in CIF or other electronic format see DOI: 10.1039/b815001j. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: David J. Harding – PersonEntity: Name: NameFull: Phimphaka Harding – PersonEntity: Name: NameFull: Rathawat Daengngern – PersonEntity: Name: NameFull: Saranphong Yimklan – PersonEntity: Name: NameFull: Harry Adams IsPartOfRelationships: – BibEntity: Dates: – D: 10 M: 02 Text: Feb2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 14779226 Numbering: – Type: volume Value: 2009 – Type: issue Value: 8 Titles: – TitleFull: Dalton Transactions: An International Journal of Inorganic Chemistry Type: main |
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