Thermal isomerization of ruthenium hydride compounds containing asymmetric bidentate pyrrole-imine ligands

Hsuan Ting Lai, Kun Hao Chen, Yong Jie Li, Cheng Hsien Wu, Ching Han Hu, Chia Her Lin, Jui Hsien Huang

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A series of ruthenium hydride compounds containing substituted bidentate pyrrole-imine ligands were synthesized and characterized. Reacting RuHCl(CO)(PPh3)3 with one equivalent of [C4H3NH(2-CH=NR)] in ethanol in the presence of KOH gave compounds {RuH(CO)(PPh3)2[C4H3N(2-CH=NR)]} where trans-Py-Ru-H 1, R = CH2CH2C6H9; cis-Py-Ru-H 2, R = Ph-2-Me; and cis-Py-Ru-H 3, R = C6H11. Heating trans-Py-Ru-H 1 in toluene at 70°C for 12 hr resulted a thermal conversion of the trans-Py-Ru-H 1 into its cis form, {RuH(CO)(PPh3)2[C4H3N(2-CH=NCH2CH2C6H9)]} (cis-Py-Ru-H 1) in very high yield. The 1H NMR spectra of trans-Py-Ru-H 1, cis-Py-Ru-H 2, cis-Py-Ru-H 3, and cis-Py-Ru-H 1 all show a typical triplet at ca. δ–11 for the hydride. The trans and cis form indicate the relative positions of pyrrole ring and hydride. The geometries of trans-Py-Ru-H 1, cis-Py-Ru-H 1, and cis-Py-Ru-H 3 are relatively similar showing typical octahedral geometries with two PPh3 fragments arranged in trans positions.

Original languageEnglish
Pages (from-to)1041-1047
Number of pages7
JournalJournal of the Chinese Chemical Society
Issue number9
Publication statusPublished - 2019 Sep 1


All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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