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Cis-Dichloro-bis(2 ,6 -dimethyl-4 -phenyl-η 1 -phosphinine)platinum (3) has been prepared by ligand substitution from cis -dichloro(2,5-cyclooctadiene)platinum and characterized by spectroscopy ( 1 H ,  13 C,  31 P NMR, IR, UV-Vis), CV and X-ray diffraction (space group P2 1 /c, a = 14.998, b = 16.540, c - 11.506 Å, α = γ = 90°, β = 92.46°, Z = 4). In line with findings for similar P hybridization states, the Pt-P bond length (221 pm) in 3 equals that in η 1  -phosphaalkene Pt complexes and falls short of the respective parameters in Pt phosphane species. The stretching frequencies ν PtCl  and the bond length Pt-Cl indicate that phosphinines and phosphaalkenes, relative to phosphanes, adopt a lower position on the trans-influence scale. This gradation is also suggested by the coupling constants  1 J( 195 Pt, 31 P).

zeitschrift für naturforschung b

Metal Complexes of Heteroarenes, X [1].η 1 -Coordination of Phosphinine: Synthesis and Structure of cis-Dichloro-bis(2,6-dimethyl-4-phenyl-phosphinine)platinum