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Issue 6, 2018
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Phosphine-assisted C–H bond activation in Schiff bases and formation of novel organo cobalt complexes bearing Schiff base ligands

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Abstract

Two novel cobalt Schiff base complexes 3 and 4, ((2-PPh2)C6H4)C[double bond, length as m-dash]N(C10H7)Co(PMe3)2 (3) and ((2-PPh2)C6H4)CH[double bond, length as m-dash]N(C6H5)Co(PMe3)2 (4) with η2(C–H) coordination, were synthesized by the reactions of Schiff base preligands ((2-PPh2)C6H4)CH[double bond, length as m-dash]N(C10H7) (1) and ((2-PPh2)C6H4)CH[double bond, length as m-dash]N(C6H5) (2) with CoMe(PMe3)4via 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[double bond, length as m-dash]N)-coordinated cobalt(0) complexes ((2-PPh2)C6H4)CH[double bond, length as m-dash]N(C10H7)Co(PMe3)2 (5) and ((2-PPh2)C6H4)CH[double bond, length as m-dash]N(C6H5)Co(PMe3)2 (6). Complex ((2-PPh2)C6H4)C[double bond, length as m-dash]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[double bond, length as m-dash]N(C10H7)Co(CO)2(PMe3) (8). The molecular structures of 4, 5, 7 and 8 were determined by single-crystal X-ray diffraction.

Graphical abstract: Phosphine-assisted C–H bond activation in Schiff bases and formation of novel organo cobalt complexes bearing Schiff base ligands

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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., 2018,42, 4646-4652
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    Phosphine-assisted C–H bond activation in Schiff bases and formation of novel organo cobalt complexes bearing Schiff base ligands

    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, 42, 4646
    DOI: 10.1039/C7NJ03480F

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