Formation and isomerization of cis, cis-Ir(H)2( - Ph)(CO)(PPh3)2 and cis, cis-Ir(H)( - Ph)2(CO)(PPh3)2 in oxidative addition of hydrogen and phenylacetylene to trans-Ir(CO)( - Ph)(PPh3)2

Chong Shik Chin, Moonhyun Oh, Gyongshik Won, Haeyeon Cho, Dongchan Shin

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Oxidative addition of H-R (H - Ph and H2) to trans-Ir( - Ph)(CO)(PPh3)2 (2) gives the initial products, cis, cis-Ir(H)( - Ph)2(CO)(PPh3)2 (3a) and cis, cis-Ir(H)2( - Ph)(CO)(PPh3)2 (3b), respectively. Both cis-bis(PPh3) complexes, 3a and 3b undergo isomerization to give the trans-bis(PPh3) complexes, trans, trans-Ir(H)( - Ph)2(CO)(PPh3)2 (4a) and cis, trans-Ir(H)2( - Ph)(CO)(PPh3)2 (4b). The isomerization, 3b→4b is first order with respect to 3b with k1=6.37×10-4 s-1 at 25°C under N2 in CDCl3. The reaction rate (k1) seems independent of the concentration of H2. A large negative entropy of activation (ΔS=-24.9±5.7 cal deg-1 mol-1) and a relatively small enthalpy of activation (ΔH=14.5±3.3 kcal mol-1) were obtained in the temperature range 15~35°C for the isomerization, 3b→4b under 1 atm of H2.

Original languageEnglish
Pages (from-to)811-815
Number of pages5
Issue number6
Publication statusPublished - 1999 Jan 22

Bibliographical note

Funding Information:
We wish to thank the Korea Science and Engineering Foundation (Grant No. 97-05-01-05-01-3) and the Korean Ministry of Education (Grant No. BSRI-97-3412) for their financial supports of this study.

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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