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Babij C, Farrar DH, Poë AJ, Tunik SP. Kinetic study of the reaction of [Rh(6)(CO)(16)] with NO(2)(-): insertion of the nitrogen atom into a Rh(6) cluster core. Dalton Trans 2008:5922-9. [PMID: 19082048 DOI: 10.1039/b808666d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The cluster [Rh(6)(CO)(16)] reacts with (PPN)NO(2) [PPN = N(PPh(3))(2)] in dichloromethane to form the known cluster [Rh(6)N(CO)(15)](-) in which the nitrogen atom is encapsulated within a trigonal prismatic Rh(6) cluster. A kinetic study shows that the reactions proceed in six kinetically distinguishable steps followed by another four steps that are kinetically unidentifiable but that can nevertheless be identified speculatively on the basis of analogies to other reactions of carbonyl clusters. Stopped-flow studies show that the initial step involves bimolecular nucleophilic attack on a carbon atom of a CO ligand by an oxygen atom in the NO(2)(-) ion. This is followed by CO loss (via a [CO]-dependent and a [CO]-independent path) with formation of [Rh(6)(CO)(14)(OC[combining low line]ON[combining low line]O)](-). Activation parameters have been obtained for all three steps. [Rh(6)(CO)(14)(OC[combining low line]ON[combining low line]O)](-) has been characterized spectroscopically and has the C and N atoms coordinated to one Rh atom. Reaction of this cluster with CO leads to the fairly rapid establishment of an equilibrium with the adduct [Rh(6)(CO)(n)(OC[combining low line]ON[combining low line]O)](-), where n is most probably 15. Both participants in this equilibrium react more slowly with loss of CO(2), and these reactions show negligible dependence on temperature and are therefore largely entropy controlled. The overall reaction is very solvent dependent and numerous side reactions can be identified if the conditions of reaction are not closely controlled.
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Affiliation(s)
- Claudia Babij
- Lash Miller Chemistry Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, CanadaM5S 3H6
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Shiu KB, Yang LT, Jean SW, Li CH, Wu RR, Wang JC, Liou LS, Chiang MY. Syntheses, Structures, and Reactivity of Diruthenium Phosphine Carbonyl Complexes of Nitrites and Nitrates. Inorg Chem 1996. [DOI: 10.1021/ic960530p] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kom-Bei Shiu
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Luh-Tin Yang
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Shih-Wei Jean
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Chien-Hsing Li
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Ru-Rong Wu
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Ju-Chun Wang
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Lin-Shu Liou
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
| | - Michael Y. Chiang
- Departments of Chemistry, National Cheng Kung University, Tainan 701, Taiwan, Republic of China, Soochow University, Taipei 111, Taiwan, Republic of China, and National Sun Yat-Sen University, Kaohsiung 804, Taiwan, Republic of China
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