Abstract
3,6-Bis(2-thienyl)-1,2,4,5-tetrazine (bttz) reacts with trans-Pt(dmso)2(mes)2, mes = mesityl = 2,4,6-trimethylphenyl, under twofold cyclometalation to yield structurally characterized (m-bttz-2H+)Pt(dmso)(mes)2 with uncoordinated thiophene sulfur atoms and bttz deprotonated in the 3,3' positions. The structural features include cis-positioned carbanionic ligands, twisted mesityl substituents, S-coordinated dmso ligands with the S:O bonds lying in the mol. plane, shortened inter-ring bonds, and rather short Pt-C bonds at 1.998(9)/2.00(1) \AA (Pt-Cmes) and 1.985(9)/1.99(1) \AA (Pt-Cbttz-2H+). Reversible redn. to (μ-bttz-2H+)Pt(dmso)(mes)2·- causes a high-energy shift of the charge transfer bands and the appearance of an unresolved EPR signal at g = 1.9905. on SciFinder(R)
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