Imidazole→imidazolidine. Preparation by reduction of [Os(H)(CO)(PPh3)2(PyaiR)]+/0 with NaBH4 and characterisation of the products (PyaiR=1-alkyl-2-{3′-(pyridylazo)}imidazole)
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| Title: | Imidazole→imidazolidine. Preparation by reduction of [Os(H)(CO)(PPh3)2(PyaiR)]+/0 with NaBH4 and characterisation of the products (PyaiR=1-alkyl-2-{3′-(pyridylazo)}imidazole) |
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| Authors: | Mondal, T.K.1, Mathur, T.1, Slawin, A.M.Z.2, Woollins, J.D.2, Sinha, C.1 c_r_sinha@yahoo.com |
| Source: | Journal of Organometallic Chemistry. Mar2007, Vol. 692 Issue 7, p1472-1481. 10p. |
| Subjects: | Imidazoles, Electrochemistry, Oxidation-reduction reaction, Complex compounds |
| Abstract: | Abstract: The reaction of 2-(3′-pyridylazo)imidazole (PyaiH) or 1-alkyl-2-(3′-pyridylazo)imidazole (PyaiR) with in THF or MeCN has synthesized stable red coloured (2a) or (2b–2d). While the reaction of PyaiR and in dry n-heptane has separated shining green compound and has been identified azo-anion radical, [Os(Cl)(CO)(PPh3)2(PyaiR− )] (4b–4d). The reaction performance in n-hexane or toluene is very poor. Upon addition of Cl2 in MeCN to CH2Cl2 solution of 2 or 4 the colour has changed sharply to red-violet and has isolated (3). The reaction of 2 in ethanol with NaBH4 suspension under dinitrogen has reduced coordinated imidazole group to imidazolidine (5). One of the structures of azo-imidazolidinate-hydrido-osmium–carbonyl, [Os(H)(CO)(PPh3)2(PyaiH2)] (5a), is characterized by X-ray diffraction study. Other spectroscopic studies (IR, UV–Vis, NMR) are used to identify the structure of all the complexes. Electrochemistry shows two consecutive anodic peaks (E pa) and suggest irreversible oxidations Os(III)/Os(II), Os(IV)/Os(III) along with azo reductions. [Copyright &y& Elsevier] |
| Copyright of Journal of Organometallic Chemistry is the property of Elsevier B.V. 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: 23993502 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Imidazole→imidazolidine. Preparation by reduction of [Os(H)(CO)(PPh3)2(PyaiR)]+/0 with NaBH4 and characterisation of the products (PyaiR=1-alkyl-2-{3′-(pyridylazo)}imidazole) – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Mondal%2C+T%2EK%2E%22">Mondal, T.K.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Mathur%2C+T%2E%22">Mathur, T.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Slawin%2C+A%2EM%2EZ%2E%22">Slawin, A.M.Z.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Woollins%2C+J%2ED%2E%22">Woollins, J.D.</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Sinha%2C+C%2E%22">Sinha, C.</searchLink><relatesTo>1</relatesTo><i> c_r_sinha@yahoo.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Organometallic+Chemistry%22">Journal of Organometallic Chemistry</searchLink>. Mar2007, Vol. 692 Issue 7, p1472-1481. 10p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Imidazoles%22">Imidazoles</searchLink><br /><searchLink fieldCode="DE" term="%22Electrochemistry%22">Electrochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Oxidation-reduction+reaction%22">Oxidation-reduction reaction</searchLink><br /><searchLink fieldCode="DE" term="%22Complex+compounds%22">Complex compounds</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Abstract: The reaction of 2-(3′-pyridylazo)imidazole (PyaiH) or 1-alkyl-2-(3′-pyridylazo)imidazole (PyaiR) with in THF or MeCN has synthesized stable red coloured (2a) or (2b–2d). While the reaction of PyaiR and in dry n-heptane has separated shining green compound and has been identified azo-anion radical, [Os(Cl)(CO)(PPh3)2(PyaiR− )] (4b–4d). The reaction performance in n-hexane or toluene is very poor. Upon addition of Cl2 in MeCN to CH2Cl2 solution of 2 or 4 the colour has changed sharply to red-violet and has isolated (3). The reaction of 2 in ethanol with NaBH4 suspension under dinitrogen has reduced coordinated imidazole group to imidazolidine (5). One of the structures of azo-imidazolidinate-hydrido-osmium–carbonyl, [Os(H)(CO)(PPh3)2(PyaiH2)] (5a), is characterized by X-ray diffraction study. Other spectroscopic studies (IR, UV–Vis, NMR) are used to identify the structure of all the complexes. Electrochemistry shows two consecutive anodic peaks (E pa) and suggest irreversible oxidations Os(III)/Os(II), Os(IV)/Os(III) along with azo reductions. [Copyright &y& Elsevier] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Organometallic Chemistry is the property of Elsevier B.V. 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: 10.1016/j.jorganchem.2006.11.044 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 1472 Subjects: – SubjectFull: Imidazoles Type: general – SubjectFull: Electrochemistry Type: general – SubjectFull: Oxidation-reduction reaction Type: general – SubjectFull: Complex compounds Type: general Titles: – TitleFull: Imidazole→imidazolidine. Preparation by reduction of [Os(H)(CO)(PPh3)2(PyaiR)]+/0 with NaBH4 and characterisation of the products (PyaiR=1-alkyl-2-{3′-(pyridylazo)}imidazole) Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Mondal, T.K. – PersonEntity: Name: NameFull: Mathur, T. – PersonEntity: Name: NameFull: Slawin, A.M.Z. – PersonEntity: Name: NameFull: Woollins, J.D. – PersonEntity: Name: NameFull: Sinha, C. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2007 Type: published Y: 2007 Identifiers: – Type: issn-print Value: 0022328X Numbering: – Type: volume Value: 692 – Type: issue Value: 7 Titles: – TitleFull: Journal of Organometallic Chemistry Type: main |
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