Newly designed luminescent di- and tetra-nuclear double rollover cycloplatinated(II) complexes

作者：Aghakhanpour Reza Babadi; Nabavizadeh S Masoud^*; Rashidi Mehdi^*

来源：Journal of Organometallic Chemistry, 2016, 819: 216-227.

DOI：10.1016/j.jorganchem.2016.07.007

• Roll-over cycloplatinated
• Bisphosphine
• Photoluminescence
• DFT calculations

The known binuclear complex [Pt-2(mu-bpy-2H)(Me)(2)(DMSO)(2)], 1, in which bpy - 2,2'-bipyridine and DMSO = dimethyl sulfoxide, was reacted with 2 equiv bis(diphenylphosphino)methane, dppm, to give the new double rollover cycloplatinated(II) complex [Pt-2(mu-bpy-2H)(Me)(2)(k(1)-dppm)(2)], 2, in which each metallic center bears a monodentate dppm ligand. The reaction of 2 with 2 equiv of the known monomeric cycloplatinated (II) complex [Pt(Me)(bhq-H)(SMe2)], in which bhq = 7,8-benzo[h] quinoline, gave the new unsymmetrical tetranuclear complex [{(bhq-H)(Me) Pt(m-dppm) Pt(Me)}(2)(mu-bpy-2H)], 3. The complexes were fully characterized using multinuclear (H-1 and P-31{H-1}) NMR spectroscopy and elemental analysis. Photophysical properties of the synthesized complexes were investigated and the results were confirmed by DFT calculations. The complexes 1-3 are brightly luminescent in solution and solid state. The complex 1 exhibits structured emission band, complying with the cyclometalated ligand being the centered emissive state. The complexes 2 and 3, however, exhibit unstructured emission bands, confirming a large amount of MLCT in their emissive states.

• 出版日期2016-9-15