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Phosphine-assisted C-H Bond Activation in Schiff Base and Formation of Novel Organo Cobalt Complexes Bearing Schiff Base Ligand

Abstract

Two novel cobalt Schiff base complexes 3 and 4, ((2-PPh2)C6H4)C=N(C10H7)Co(PMe3)2 (3) and ((2-PPh2)C6H4)CH=N(C6H5)Co(PMe3)2(4) with 2(C-H) coordination, were synthesized by the reactions of Schiff base preligands ((2-PPh2)C6H4)CH=N(C10H7) (1) and ((2-PPh2)C6H4)CH=N(C6H5) (2) with CoMe(PMe3)4 via sp2 C-H bond activation. Under similar reaction conditions, the reactions of Co(PMe3)4 with 1 and 2 gave rise to the simple π-(C=N)-coordinated cobalt(0) complexes ((2-PPh2)C6H4)CH=N(C10H7)Co(PMe3)2 (5) and ((2-PPh2)C6H4)CH=N(C6H5)Co(PMe3)2 (6). Complex ((2-PPh2)C6H4)C=N(C10H6)CoI(PMe3)2 (7) was obtained through the reaction of 3 with iodomethane via the activation of the second C-H bond in 1. The substitution reaction of complex 3 with carbon monoxide afforded the dicarbonyl cobalt(I) complex ((2-PPh2)C6H4)C=N(C10H7)Co(CO)2(PMe3) (8). The molecular structures of 4, 5, 7 and 8 were determined by single crystal X-ray diffraction.

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Publication details

The article was received on 15 Sep 2017, accepted on 02 Feb 2018 and first published on 06 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ03480F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Phosphine-assisted C-H Bond Activation in Schiff Base and Formation of Novel Organo Cobalt Complexes Bearing Schiff Base Ligand

    H. zhang, J. xing, Y. Dong, S. xie, S. ren, X. qi, H. Sun, X. Li, O. fuhr and D. Fenske, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ03480F

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