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The reaction of Pt(Se2N2)(dppe) (1) with stoichiometric quantities of halogen (Cl2, Br2 or I2) in CH2Cl2 yields PtX2(dppe) and Se4N4. In the case of iodine the rate of reaction was much slower than for the other halogens and 31P n.m.r. evidence suggests that the reaction proceeds via the protonated complex [Pt(Se2N2H)(dppe)]I. The crystal structure of 3[PtI2(dppe)]·I2·2[CH2C2] is reported
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