Abstract
The ligand tri-2-pyridylamine (tripyuam ( 1)), which was expected to be highly resistant to thermal degradation, forms a variety of stable complexes with rhenium, tungsten and iridium. Reaction of 1 with ReCl 3) (benzil), WCl 4(PPh 3) 2 and (NH 4)IrCl 6 yields the chloride complexes ReCl 3(tripyam) ( 2), WCl 4(tripyam) ( 3) and IrCl 3(tripyam) ( 4), respectively. In addition, the first tripyam supported hydride, [IrH 2(PPh 3) 2( η 2-tripyam)]BF 4, ( 5), was synthesized by reaction of 1 with dihydride [IrH 2(PPh 3) 2(acetone) 2]BF 4. The principal characteristic of 2, 4 and 5 is their very high thermal stability: they survive thermolysis at temperatures up to 270°C. Finally, the high oxidation state complexes [ReO 3(tripyam)]ReO 4 ( 6) and [ReO(OCH 2CH 2O) (PPh 3) (tripyam)]Cl ( 7) were also synthesized.
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