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Three ŋ4-(C=C-C=O) coordination cobalt(I) complexes 1-3 were synthesized by the reactions of cinnamaldehyde, p-fluorocinnamaldehyde and p-chlorocinnamaldehyde with CoMe(PMe3)4. Complex 4 as ŋ2-(C=C) coordination was prepared by the reaction of chalcone with Co(PMe3)4. The structures of complexes 1-4 were confirmedŋ4-Coordination; ŋ2-Coordination; Cinnamaldehyde; Cobalt by single-crystal X-ray diffraction. Although the reactions didn't undergo C-H bond activation and decarbonylation, the formation of complexes 1-4 deepens our understanding of the reactions between α,β-unsaturated aldehyde or ketone with low-valent central cobalt atom. [ABSTRACT FROM AUTHOR]