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Two mesomeric forms of 3b-Pt(CO); 3ba favors a tricarbene coordination at Pt(0) whereas 3bb is consistent Pt(II) forming two C-Pt s-bonds similar to 3a-Pt(CO). The short central C-Pt bond length of 2.002 Å indicates a partial doubly donation of the carbone C atom as shown in Figure 5. The planar environment at Pt is typical for Pt(II) and supports this view [72].
