Novel molecular tweezers-type complex 1  based on phosphorescent cationic alkynylplatinum(II) terpyridine building block has been synthesized and characterized by NMR, mass spectroscopy, elemental analysis and X-ray diffraction study.  Host-guest chemistry of the host complex 1  and various guest metal complexes with different ligands, charges and/or metal centers has been investigated.  Various metal complexes including the negatively charged platinum complexes can interact with 1  in a 1:1 manner, which is in contrast to the commonly observed formation of insoluble platinum(II) double salts in a one-dimensional infinite chain such as the Magnus's green salt.  Upon addition of guest molecules to 1  in CH2Cl2 solution, spectroscopic changes with new absorption and emission at lower-energy region were observed as a result of significant metal-metal, p-p, and electrostatic interactions.  1H NMR titration and 2D NMR studies suggest that the host-guest interaction is predominantly in the sandwiched association mode of the molecular tweezers.

Phosphorescent molecular tweezers based on alkynylplatinum(II) terpyridine system: Host-guest chemistry involving heterologous Pt···M interaction

243rd National Meeting (2012)

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