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Platinum(II) complexes (1–6) with selenones (HLn), having the general formula [Pt(HLn)4]Cl2, were prepared and characterized by elemental analysis, IR and NMR (1H, 13C, 77Se and 195Pt) methods and one of them, [Pt(N-ethylimidazolidine-2-selenone)4]Cl2 (3) by X-ray crystallography. A decrease in the IR frequency of the >CSe mode and an upfield shift in 13C NMR for the >CSe resonance of selenones...
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