Cis and trans-bis(tetrathiafulvalene-acetylide) platinum(ii) complexes: syntheses, crystal structures, and influence of the ancillary ligands on their electronic properties†
Abstract
A series of four platinum(II) complexes bearing two tetrathiafulvalene acetylide CMe3TTF)2, cis-Pt(tBu2bipy)(C
CMe3TTF)2, cis-Pt(dppe)(C
CMe3TTF)2 and trans-Pt(PPh3)2(C
CMe3TTF)2. The
CMe3TTF)2 complex is the first oxidation wave resolved (ΔE = 70 mV) into two one-electron processes. Spectroelectrochemical investigations performed on the four complexes did not evidence any electronic interactions between the two organic electrophores. The splitting of the first oxidation wave observed in cis-Pt(dppe)(C
CMe3TTF)2 is mainly explained by the non-equivalence of the two TTF moieties induced by the geometrical constraint imposed by the ancillary