Tl(I)-, Cu(I)-, and Ag(I) Complexes of the Ditopic 1,3-Phenylene-Bridged Heteroscorpionate Ligand [1,3-C<sub>6</sub>H<sub>4</sub>(<i>t</i>BuBpz<sub>2</sub>)<sub>2</sub>]<sup>2-</sup>
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The complexes Tl2[1,3-C6H4(tBuBpz2)2] (1Tl), [Cu(PPh3)]2[1,3-C6H4(tBuBpz2)2] (1Cu), and [Ag(PPh3)]2[1,3-C6H4(tBuBpz2)2] (1Ag) featuring a novel ditopic 1,3-phenylene-bridged heteroscorpionate ligand have been prepared and investigated by 1H, 13C, 11B, and 31P NMR spectroscopy (pz = pyrazolyl). X-ray crystal structure analyses revealed 1Tl and 1Ag to adopt a trans configuration with respect to the phenylene bridge in the solid state. In solution at room temperature, both scorpionate substituents are free to rotate about their B−C(phenylene) bonds. The Tl(I) coordination to two pyrazolyl nitrogen atoms as well as the Ag(I) coordination to two pyrazolyl and one PPh3 ligand is augmented by short intramolecular contacts to the phenylene π-system.
