The DICP Research Group No. 1101 led by Prof. Keli Han, in collaboration with the research team of The University of Utah in USA headed by Prof. Peter J. Stang, has carried out a systematic study on the photophyscial properties of self-assembled multinuclear platinum metallacycles. Their results were published in the recent issue of the Journal of American Chemical Society. (J. Am. Chem. Soc., 2013, 135 (17), pp 6694–6702, DOI: 10.1021/ja402421w)
In this work, Prof. Stang’s group has synthesized a series of self-assembled multinuclear platinum metallacycles with different conformational geometries, based on the discovery that multicomponent assemblies could be quantitatively obtained from systems containing both pyridyl and carboxylate ligands due to preference in energy for heteroligated Pt-N,O coordination over homoligated Pt-N,N or Pt-O,O motifs.
Meanwhile, Prof. Han’s group employed spectroscopic techniques and quantum chemistry calculations to investigate the photophysical properties of these self-assembled multinuclear platinum metallacycles with different conformational geometries, which play an important role in electronic transitions of different organometallic systems. Novel excited-state decay mechanisms have been proposed to explain the interesting photophysical properties of the organometallic complexes with different conformational geometries. Their results indicated that platinum atoms in organometallic complexes with different ligands and different conformational geometries can have different functions, and a careful consideration of both the metal nodes and the ligands used is necessary to control the photophysical properties of supramolecular coordination complexes, particularly the various conformational geometries resulting from combination of different ligands to afford architectures with desired functionalities.