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Article: Syntheses of novel monomeric 1,4,7-trimethyl-1,4,7-triazacyclononane ruthenium complexes. Reactivities and structure of sterically encumbered cationic monoaquaruthenium(II) and monooxoruthenium(IV) complexes
Title | Syntheses of novel monomeric 1,4,7-trimethyl-1,4,7-triazacyclononane ruthenium complexes. Reactivities and structure of sterically encumbered cationic monoaquaruthenium(II) and monooxoruthenium(IV) complexes |
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Authors | |
Issue Date | 1994 |
Publisher | Royal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/dalton |
Citation | Journal Of The Chemical Society, Dalton Transactions, 1994 n. 1, p. 57-62 How to Cite? |
Abstract | The complexes [RuII(tacn)(bipy)(OH2)]2+ 1 and [RuIV(tacn)(bipy)O]2+ 2(tacn = 1,4,7-trimethyl-1,4,7-triazacyclononane, bipy = 2,2′-bipyridine) have been synthesised and their crystal structures determined: 1, monoclinic, space group C2/c, a = 34.093(4), b = 10.430(1), c = 17.369(2) Å, β = 118.54(1)°and Z = 8; 2, triclinic, space group 1̄, a = 10.795(1), b = 11.076(2), c = 11.248(1) Å, a = 110.41(2), β = 90.66(1), γ = 94.11(1)°and Z = 2. The structures reveal that tacn acts as a facial chelating ligand with bipy nearly perpendicular to the Ru=O and Ru-OH2 moieties. The RuIV=O and Ru-OH2 distances are 1.815(6) and 2.168(3) Å respectively. In aqueous solution both complexes display two reversible proton-coupled one-electron redox couples corresponding to the oxidation of RuII to RuIII and RuIII to RuIV. Complex 2 has been found to be a competent oxidant for alkene epoxidation. Preliminary-kinetic studies revealed the rate law, rate = k2[RuIV][alkene] where k2 at 299 K are (1.30 ± 0.11) × 10-3 and (2.52 ± 0.20) × 10-4 dm3 mol-1 s-1 for the epoxidation of styrene and norbornene respectively. The activation parameters have been measured and are discussed. |
Persistent Identifier | http://hdl.handle.net/10722/167847 |
ISSN | |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Cheng, WC | en_US |
dc.contributor.author | Yu, WY | en_US |
dc.contributor.author | Cheung, KK | en_US |
dc.contributor.author | Che, CM | en_US |
dc.date.accessioned | 2012-10-08T03:12:10Z | - |
dc.date.available | 2012-10-08T03:12:10Z | - |
dc.date.issued | 1994 | en_US |
dc.identifier.citation | Journal Of The Chemical Society, Dalton Transactions, 1994 n. 1, p. 57-62 | en_US |
dc.identifier.issn | 1472-7773 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/167847 | - |
dc.description.abstract | The complexes [RuII(tacn)(bipy)(OH2)]2+ 1 and [RuIV(tacn)(bipy)O]2+ 2(tacn = 1,4,7-trimethyl-1,4,7-triazacyclononane, bipy = 2,2′-bipyridine) have been synthesised and their crystal structures determined: 1, monoclinic, space group C2/c, a = 34.093(4), b = 10.430(1), c = 17.369(2) Å, β = 118.54(1)°and Z = 8; 2, triclinic, space group 1̄, a = 10.795(1), b = 11.076(2), c = 11.248(1) Å, a = 110.41(2), β = 90.66(1), γ = 94.11(1)°and Z = 2. The structures reveal that tacn acts as a facial chelating ligand with bipy nearly perpendicular to the Ru=O and Ru-OH2 moieties. The RuIV=O and Ru-OH2 distances are 1.815(6) and 2.168(3) Å respectively. In aqueous solution both complexes display two reversible proton-coupled one-electron redox couples corresponding to the oxidation of RuII to RuIII and RuIII to RuIV. Complex 2 has been found to be a competent oxidant for alkene epoxidation. Preliminary-kinetic studies revealed the rate law, rate = k2[RuIV][alkene] where k2 at 299 K are (1.30 ± 0.11) × 10-3 and (2.52 ± 0.20) × 10-4 dm3 mol-1 s-1 for the epoxidation of styrene and norbornene respectively. The activation parameters have been measured and are discussed. | en_US |
dc.language | eng | en_US |
dc.publisher | Royal Society of Chemistry. The Journal's web site is located at http://www.rsc.org/dalton | en_US |
dc.relation.ispartof | Journal of the Chemical Society, Dalton Transactions | en_US |
dc.title | Syntheses of novel monomeric 1,4,7-trimethyl-1,4,7-triazacyclononane ruthenium complexes. Reactivities and structure of sterically encumbered cationic monoaquaruthenium(II) and monooxoruthenium(IV) complexes | en_US |
dc.type | Article | en_US |
dc.identifier.email | Che, CM:cmche@hku.hk | en_US |
dc.identifier.authority | Che, CM=rp00670 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1039/DT9940000057 | en_US |
dc.identifier.scopus | eid_2-s2.0-0343173528 | en_US |
dc.identifier.issue | 1 | en_US |
dc.identifier.spage | 57 | en_US |
dc.identifier.epage | 62 | en_US |
dc.identifier.isi | WOS:A1994MQ59600010 | - |
dc.publisher.place | United Kingdom | en_US |
dc.identifier.scopusauthorid | Cheng, WC=7402169293 | en_US |
dc.identifier.scopusauthorid | Yu, WY=7403913673 | en_US |
dc.identifier.scopusauthorid | Cheung, KK=7402406613 | en_US |
dc.identifier.scopusauthorid | Che, CM=7102442791 | en_US |
dc.identifier.issnl | 1364-5447 | - |