Complexes of the bidentate ligands PPh2CH2C(But)NNR2(R = H or Me) and PPh2CH2C(But)N–NCHPh with palladium and platinum. X-Ray crystal structure of cis-[Pt{PPh2CH2C(But)NNH}2]
- 1 January 1994
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 1,p. 103-110
- https://doi.org/10.1039/dt9940000103
Abstract
tert-Butyl diphenylphosphinomethyl ketone dimethylhydrazone L1 reacts with [PtCl2(cod)](cod = cycloocta-1,5-diene) to give the chelate [[graphic omitted]Me2}] with a six-membered chelate ring; the corresponding palladium complex was also prepared. The phosphino dimethylhydrazone L1 or the phosphino hydrazone L2 also react with [PtMe2(cod)] to give [[graphic omitted]R2}], (R = Me or H); these platinum(II) complexes react with methyl iodide to give the corresponding trimethylplatinum(IV) complexes [[graphic omitted]R2}]. Treatment of [PtCl2(cod)] with 2 equivalents of L2 gave the dication cis-[[graphic omitted]H2}2]2+ isolated as the chloride or chloride hexafluorophosphate salts. The dicationic dichloride reacted with 2 moles of sodium ethoxide to give the neutral cis-[[graphic omitted]H}2]. Treatment of [PdCl2(NCPh)2] with L2 gave [[graphic omitted]H2}2]Cl2, which with sodium ethoxide gave the neutral trans-[[graphic omitted]H}2]. The mixed azine monophosphine PPh2CH2C(But)N–NCHPh L3 with [PdCl2(NCPh)2] gave the chelate complex [[graphic omitted]CHPh}] and with [PtMe2(cod)]it gave [[graphic omitted]CHPh}]. Treatment of [PtCl2(NCMe)2] with 2 equivalents of L3 gave trans-[PtCl2{PPh2CH2C(But)N–NCHPh}2] which on heating gave the dicationic dichloride salt cis-[[graphic omitted]–NCHPh}2]Cl2. Successive treatments of this salt with 1 mole of sodium methoxide gave cis-[{[graphic omitted]–NCHPh}]+ and cis-[{[graphic omitted]–NCHPh}2]. Proton, 13C –{1H}, 31P –{1H} NMR and infrared data have been obtained. Crystals of cis-[[graphic omitted]H2}2] are monoclinic, space group P21/c, with a= 1261.5(2), b= 1794.6(3), c= 1792.0(4) pm and Z= 4; final R= 0.0451 for 4088 observed reflections.Keywords
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