Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 411, Issue -, Pages 337-343Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2015.11.005
Keywords
Ionic phosphines; Diphosphines; Ionic iridium complexes; Hydroformylation; Homogeneous catalysis
Categories
Funding
- National Natural Science Foundation of China [21473058, 21273077, 21076083]
- Ministry of Science and Technology of China [2011CB201403]
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The effect of positive charges in the diphosphino-imidazolium salts of L2 was investigated in terms of coordinating character, structures of corresponding Ir-complexes and catalysis for hydroformylation. It was found that the involved positive charges exhibited strong electron-withdrawing effect on the neighbored phosphine fragment, rendering L2 more pi-acceptor ability than the corresponding neutral counterpart of L1. Consequently, the changed coordinating ability of L1 and L2 led to the variety in the structures and components for the Ir-complexes (Ir-L1a, Ir-L1b, Ir-L2a, and Ir-L2b). The complexation of L2 with Ir(acac)(CO)(2) led to a novel five-coordinate Ir(II)-complex of Ir-L2a chelated by a PCC (phosphine-carboanion-carbene) pincer in tripodal mode, whereas the complexation of L1 with Ir(acac)(CO)(2) led to a four-coordinate square-planar KO-complex of Ir-L1a chelated by a PCP (phosphine-carboanion-phosphine) pincer. In addition, the different catalytic performances of these Ir-complexes ligated by L1 and L2 for hydroformylation of olefins were investigated. (C) 2015 Elsevier B.V. All rights reserved.
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