The Synthesis and Spectroscopic Study of Some Bis(tertiaryphosphine)bis(N,N-dialkylselenocarbamate) Complexes of Palladium(II) and Platinum(II)

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Ten N,N-dialkylselenocarbamate complexes of palladium(II) and platinum(II), [(C6H5)3P]2Pd[SeC(O)NR2]2(1), [(C6H5)3P]2Pt[SeC(O)NR2]2 (2) (R=CH3, C2H5, n-C3H7, and n-C4H9), [CH3(C6H5)2P]2Pd[SeC(O)N-(CH3)2]2 (3), and [CH3(C6H5)2P]2Pt[SeC(O)N(CH3)2]2 (4), have been prepared. The infrared spectra and molecular-weight determinations indicate that the selenocarbamate ligand is bonded to the palladium(II) or platinum(II) through the selenium atom, with a free carbonyl group in the solid state, while in 1 and 2 two and one triphenylphosphine dissociate in a dilute solution to exist as compounds with bidentate selenocarbamate, Pd[SeC(O)NR2]2 and [(C6H5)3P]Pt[SeC(O)NR2]2, respectively. The 1H- and 31P-NMR spectra of 3 and 4 reveal that they have a trans-configuration. The same configuration is suggested for the N,N-dibutyl derivative of 2 on the basis of the spin-spin coupling constant between the 31P and 195Pt nuclei.
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