Bis(2,6-dinitroaryl)platinum Complexes. 1. Synthesis through Transmetalation Reactions

Complexes cis-Q[Pt(κ2-Ar)(κ1-Ar)Cl] [Q = Ph3PCH2Ph (1), Me4N (2); κ2-Ar = C6(NO2)2-2,6-(OMe)3-3,4,5-κ2-C,O; κ1-Ar = C6(NO2)2-2,6-(OMe)3-3,4,5-κ1-C] have been prepared by reacting
[HgAr2] [Ar = C6(NO2)2-2,6-(OMe)3-3,4,5] and Q2[Pt2Cl6] (4:1) in acetone at 100 °C. Complex
2 could be prepared by reacting [HgAr2] (i) with [Me4N]2[Pt2Cl6] (2:1) in the presence of an
excess of [Me4N]Cl or (ii) with [Me4N]2[PtCl4] (1:1). The reaction of equimolecular amounts
of 2 and Tl(acac) or AgClO4 gave, respectively, cis-Me4N[Pt(κ1-Ar)2(acac-κ2-O,O)] (3) or cis-[Pt(κ2-Ar)(κ1-Ar)(OH2)] (4), which in turn reacts with neutral ligands to give cis-[Pt(κ2-Ar)(κ1-Ar)L] [L = PhCN (5), tetrahydrothiophene (6)]. Hg(O2CCF3)2 reacts with an equimolar
amount of 2 to give cis-Me4N[Pt(κ2-Ar)(κ1-Ar){OC(O)CF3}] (7). The structures of complexes
1, 4·Et2O, 4·CH2Cl2, and 7 have been solved by X-ray diffraction studies.