Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)]
The reactions of the cluster compounds [HIr4(CO)10-n(PPh3 )n(mu-PPh2)] [n = 0, (1); 1, (2) and 2, (3)] with I2 have been investigated. Compound 1 does not react, however, the presence of PPh3 in place of CO ligand(s) activates the cluster. Both compounds 2 and 3 react with I2 under mild conditions t...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2002-01-01
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| Series: | Journal of the Brazilian Chemical Society |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000500024 |
| _version_ | 1811323273610264576 |
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| author | Braga Dario Grepioni Fabrizia Vargas Maria D. Ziglio Claudio M. |
| author_facet | Braga Dario Grepioni Fabrizia Vargas Maria D. Ziglio Claudio M. |
| author_sort | Braga Dario |
| collection | DOAJ |
| description | The reactions of the cluster compounds [HIr4(CO)10-n(PPh3 )n(mu-PPh2)] [n = 0, (1); 1, (2) and 2, (3)] with I2 have been investigated. Compound 1 does not react, however, the presence of PPh3 in place of CO ligand(s) activates the cluster. Both compounds 2 and 3 react with I2 under mild conditions to give [HIr4(mu-I)2(CO)7(PPh3)(mu-PPh 2)] (4), as the result of oxidative addition of I2 and dissociation of two CO ligands, or one CO and one PPh3 ligands, respectively. The molecular structure of 4, determined by an X-ray diffraction study, exhibits a butterfly arrangement of iridium atoms with the wings spanned by a mu-PPh2 ligand, the hinge bridged by a mu-H ligand, two hinge to wing tip edges bridged by iodine atoms and all metal atoms bearing two CO ligands, with the exception of one of the hinge atoms that contains a CO and a PPh3 ligands. This cluster exhibits the shortest average Ir<FONT FACE=Symbol>fraction three-quarters</FONT>Ir bond length [2.698(2) Å] observed so far for a derivative of 1 and this is in accord with the relatively high average oxidation state of its metal atoms (+1) for a carbonyl cluster compound. |
| first_indexed | 2024-04-13T13:51:11Z |
| format | Article |
| id | doaj.art-7e4c5e62cefe4c9b9d2775e30dfb834d |
| institution | Directory Open Access Journal |
| issn | 0103-5053 |
| language | English |
| last_indexed | 2024-04-13T13:51:11Z |
| publishDate | 2002-01-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Journal of the Brazilian Chemical Society |
| spelling | doaj.art-7e4c5e62cefe4c9b9d2775e30dfb834d2022-12-22T02:44:19ZengSociedade Brasileira de QuímicaJournal of the Brazilian Chemical Society0103-50532002-01-01135682686Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)]Braga DarioGrepioni FabriziaVargas Maria D.Ziglio Claudio M.The reactions of the cluster compounds [HIr4(CO)10-n(PPh3 )n(mu-PPh2)] [n = 0, (1); 1, (2) and 2, (3)] with I2 have been investigated. Compound 1 does not react, however, the presence of PPh3 in place of CO ligand(s) activates the cluster. Both compounds 2 and 3 react with I2 under mild conditions to give [HIr4(mu-I)2(CO)7(PPh3)(mu-PPh 2)] (4), as the result of oxidative addition of I2 and dissociation of two CO ligands, or one CO and one PPh3 ligands, respectively. The molecular structure of 4, determined by an X-ray diffraction study, exhibits a butterfly arrangement of iridium atoms with the wings spanned by a mu-PPh2 ligand, the hinge bridged by a mu-H ligand, two hinge to wing tip edges bridged by iodine atoms and all metal atoms bearing two CO ligands, with the exception of one of the hinge atoms that contains a CO and a PPh3 ligands. This cluster exhibits the shortest average Ir<FONT FACE=Symbol>fraction three-quarters</FONT>Ir bond length [2.698(2) Å] observed so far for a derivative of 1 and this is in accord with the relatively high average oxidation state of its metal atoms (+1) for a carbonyl cluster compound.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000500024iridium clusteroxidative additioniodineX-ray molecular structure |
| spellingShingle | Braga Dario Grepioni Fabrizia Vargas Maria D. Ziglio Claudio M. Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)] Journal of the Brazilian Chemical Society iridium cluster oxidative addition iodine X-ray molecular structure |
| title | Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)] |
| title_full | Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)] |
| title_fullStr | Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)] |
| title_full_unstemmed | Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)] |
| title_short | Oxidative Addition Reactions of I2 with [HIr4(CO)10-n(PPh3 )n(m-PPh2)] (n = 1 and 2) and Crystal and Molecular Structure of [HIr4(m-I)2(CO)7 (PPh3)(m-PPh2)] |
| title_sort | oxidative addition reactions of i2 with hir4 co 10 n pph3 n m pph2 n 1 and 2 and crystal and molecular structure of hir4 m i 2 co 7 pph3 m pph2 |
| topic | iridium cluster oxidative addition iodine X-ray molecular structure |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532002000500024 |
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