Synthesis, Structure, and Photophysical Properties of Platinum Compounds with Thiophene-Derived Cyclohexyl Diimine Ligands

Platinum­(II) and platinum­(IV) compounds were prepared
by the stereoselective
and regioselective reactions of thiophene-derived cyclohexyl diimine
C^N^N-ligands with [Pt2Me4(μ-SMe2)2]. Newly synthesized ligands were characterized by NMR
spectroscopy and elemental analysis, and Pt­(II)/Pt­(IV) compounds were
characterized by NMR spectroscopy, elemental analysis, high-resolution
mass spectrometry, and single-crystal X-ray diffraction. UV–vis
absorbance and photoluminescence measurements were performed on newly
synthesized complexes, as well as structurally related Pt­(II)/Pt­(IV)
compounds with benzene-derived cyclohexyl diimine ligands, in dichloromethane
solution, as solids, and as 5% by weight PMMA-doped films. DFT and
TD-DFT calculations were performed, and the results were compared
with the observed spectroscopic properties of the newly synthesized
complexes. X-ray total scattering measurements and real space pair
distribution function analysis were performed on the synthesized complexes
to examine the local- and intermediate-range atomic structures of
the emissive solid states.