Novel porphyrin-thallium-platinum complex with “naked” metal-metal bond: multinuclear NMR characterization of [(tpp)Tl-Pt(CN)5] and [(thpp)Tl-Pt(CN)5] in solution |
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| Authors: | Guibin Ma Mikhail Maliarik Licheng Sun |
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| Institution: | a Inorganic Chemistry, Department of Chemistry, The Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden
b Organic Chemistry, Department of Chemisty, The Royal Institute of Technology (KTH), S-100 44 Stockholm, Sweden |
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| Abstract: | The novel porphyrin-thallium-platinum complexes with “naked” metal-metal bond, with the composition (tpp)Tl-Pt(CN)5]2− (1) and (thpp)Tl-Pt(CN)5]2− (2) (tpp = tetraphenylporphrin and thpp = tetrakis(4-hydroxyphenyl)-porphine), were synthesized and characterised by multinuclear NMR (205Tl, 195Pt, 13C and 1H) and Raman spectroscopies in solution. The presence of a direct Pt-Tl metal-metal bond in the complexes is convincingly confirmed by a very strong one-bond 195Pt-205Tl spin-spin coupling (47.8 and 48.3 kHz for 1 and 2, respectively) detected in both Pt and Tl NMR spectra. The corresponding force constant in molecule 1, 1.92 N cm−1, was calculated using Raman stretching frequency of the Pt-Tl vibration and is characteristic for a single metal-metal bond. |
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| Keywords: | Metal-metal bond Porphyrin complexes Platinum compounds Thallium compounds Solution structure |
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