Double cyclometallation of bridging 3,6-bis(2-thienyl)-1,2,4,5-tetrazine in a dinuclear mesityl(dimethylsulfoxide)platinum(II) complex: Structure and properties |
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| Authors: | Biprajit Sarkar Thilo Schurr Ingo Hartenbach Thomas Schleid Jan Fiedler Wolfgang Kaim |
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| Institution: | 1. Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, D-70550 Stuttgart, Germany;2. J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolej?kova 3, CZ-18223 Prague, Czech Republic;1. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, USA;2. Department of Chemistry, Texas A&M University, College Station, TX 77843, USA;3. Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA |
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| 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 cyclometallation to yield structurally characterized (μ-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 molecular plane, shortened inter-ring bonds, and rather short Pt–C bonds at 1.998(9)/2.00(1) Å (Pt–Cmes) and 1.985(9)/1.99(1) Å (Pt–Cbttz-2H+). Reversible reduction 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. |
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