Syntheses and structures of N-polyfluorophenyl- and N,N′-bis(polyfluorophenyl)ethane-1,2-diaminato(1- or 2-)platinum(II) complexes

The reaction of [PtX2(L)] (X = Cl, Br, I; L = NH2CH2CH2NY2; Y = Et, Me) with thallium(I) carbonate and a polyfluorobenzene (RF) in pyridine (py) yields the platinum(II) complexes, [Pt{N(R)CH2CH2NY2}X(py)] (R = C6F5, 4-HC6F4, 4-BrC6F4, or 4-IC6F4, Y = Et (1), Me (2), X = Cl, Br or I) in an improved synthesis. From the reaction of [PtCl2(H2NCH2)2)] with Tl2CO3 and 1,2,3,4-tetrafluorobenzene or 2-bromo-1,3,4,5-tetrafluorobenzene in py, the new complexes [Pt(NRCH2)2(py)2] (3) (R = C6H2F3-2,3,6 and C6HBrF3-2,3,5,6) have been isolated but the latter preparation also gave product(s) with a 4-bromo-2,3,5-trifluorophenyl group. From an analogous preparation in 4-ethylpyridine (etpy), [Pt(N(4-HC6F4)CH2)2(etpy)2] (4) was obtained. The X-ray crystal structures of (3) (R = C6HBrF3-2,3,5,6) and (4) were determined as well as that of the previously prepared (3) (R = 4-BrC6F4) and a more precise structure of (3) (R = 4-HC6F4) has been obtained.