Square planar ferrocenylethynyl transition metal complexes M(C=CFc)2(PR3)2 (M = Pt, Pd, Ni; Fc = (C5H4)Fe(C5H5)) were prepared by the reaction of MCl2(PR3)2 with ethynylferrocene in the presence of a CuI catalyst in diethylamine, and characterized by spectral analyses. An interaction between transition metals and an iron atom was studied by using electronic spectroscopy.