Synthesis and structural and photophysical
characterization of
platinum dihalogenide complexes formulated as [PtHal2L2], where Hal = Cl and I, with different 10-(aryl)phenoxarsine
ligands such as 10-(p-chlorophenyl)phenoxarsine,
10-(p-tolyl)phenoxarsine, and 10-(phenyl)phenoxarsine
are reported. The structures of complexes were determined by NMR spectroscopy,
mass spectrometry, and X-ray analysis. Cis/trans isomerism of the
complexes in solution was studied by NMR spectroscopy. In the solid
state, under UV irradiation, platinum diiodide trans complexes exhibit
an intense orange-red emission, which was attributed to a metal halide-centered
triplet state. The UV/vis absorption and emission properties were
studied and rationalized by density functional theory (DFT) and time-dependent
DFT calculations.