The IPB has once again been recognized for its exemplary actions in terms of equal opportunity-oriented personnel and organizational policies and has received the TOTAL E-QUALITY certification for the…
The Plant Science Student Conference (PSSC) has been organised by students from the two Leibniz institutes, IPK and IPB, every year for the last 20 years. In this interview, Christina Wäsch (IPK) and…
Kluge, T.; Bette, M.; Vetter, C.; Schmidt, J.; Steinborn, D.;Synthesis and characterization of diacetyl platinum(II) complexes with two primary and secondary amine ligandsJ. Organomet. Chem.71593-101(2012)DOI: 10.1016/j.jorganchem.2012.05.043
[Pt(COMe)2(bpy)] (2; bpy = 2,2′-bipyridine) and [Pt(COMe)2{H(Me)dmg}] (5; H(Me)dmg = MeO–NC(Me)–C(Me)N–OH) were found to react with primary and secondary amines yielding diacetyl platinum(II) complexes with two monodendate amine ligands [Pt(COMe)2(NH2R)2] (R = Bn, 3a; CH2CH2Ph, 3b; Et, 3c; i-Pr, 3d; CH2CHCH2, 3e; Cy, 3f; Bn = benzyl, Cy = cyclohexyl) and [Pt(COMe)2(NHR2)2] (R = Me, 6a; Et, 6b), respectively. The equilibrium of these ligand exchange reactions was investigated by NMR experiments and DFT calculations showing that complex 5 is the more preferable starting complex and a large excess of the amine has to be used. The sterically demanding diisopropylamine was found to react with 5 yielding a thermally highly unstable dinuclear bis(acetyl) bridged complex [{Pt(COMe){NH(i-Pr)2}}2(μ-COMe)2] (7). Analogous reactions with ethylenediamine derivatives resulted in the formation of [Pt(COMe)2(N^N)] (N^N = ethylenediamine, en, 8a; N,N′-dimethylethylenediamine, 8b; N,N-dimethylethylenediamine, 8c; N,N,N′,N′-tetramethylethylenediamine, TMEDA, 8d). All complexes were fully characterized by microanalysis/high-resolution ESI mass spectrometry, by NMR (1H, 13C, 195Pt) and IR spectroscopies as well as by single-crystal X-ray diffraction measurements (3a/3d). Due to the high trans influence of the acetyl ligands, the Pt–N bonds were found to be relatively long (2.164(2)–2.182(3) Å). The resulting weak coordination of the amines gave rise to a decomposition of complexes 3 under CO extrusion yielding carbonyl–methyl complexes.