Acidities of Platinum(II) μ-Hydroxo Complexes Bearing Diphosphine Ligands
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https://figshare.com/articles/dataset/Acidities_of_Platinum_II_Hydroxo_Complexes_Bearing_Diphosphine_Ligands/3320266
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The pKa values in DMSO of the monoprotic complexes [(L2Pt)2(μ-OH)(μ-NMePh)]2+ (4) (L2 = Ph2PCH2CH2PPh2
(dppe), Ph2PCMe2PPh2 (dppip)) are 11.9 ± 0.1 (L2 = dppe) and 13.5 ± 0.2 (L2 = dppip) as determined by 31P
NMR equilibrium titration with bases of known pKa. Complexes 4 were prepared by treatment of [L2Pt(μ-OH)]22+ (1)
with N-methylaniline. The oxo complexes [(L2Pt)2(μ-O)(μ-NMePh)]+, formed in the equilibrium titration reactions,
were independently synthesized in THF by deprotonation of [(L2Pt)2(μ-OH)(μ-NMePh)]2+ with NaN(SiMe3)2 and
characterized as NaBF4 adducts. Similar experiments with diprotic [L2Pt(μ-OH)]22+ (L2 = dppe, Ph2PCH2CH2CH2PPh2 (dppp)) were complicated by exchange processes and were less conclusive, giving pKa1 < 18 and pKa2 > 18
in DMSO.
创建时间：
2016-05-06
