Abstract
A facile procedure for synthesizing the mono(hydroxo)tris(carboxylato) platinum(IV) species has been achieved. The reaction of [PtII(OH) 2(dmpda)] (dmpda = 2,2-dimethyl-1,3-propanediamine) with a 30% aqueous solution of H2O2 in the presence of a carboxylic acid produces a stable [PtIV(OOCR)3(OH)(dmpda)] (R = Me, Et) complex in high yield. The crystal structures of [PtIV(OOCMe) 3(OH)(dmpda)] · H2O (triclinic P1 bar, a = 8.761(2) Å, b = 9.245(3) Å, c = 10.659(2) Å, α = 106.25(2)°, β = 93.90(2)°, γ = 98.92(2)°, V= 813.1(3) Å3, Z = 2, R = 0.0474) and [PtIV(OOCEt) 3(OH)(dmpda)] (monoclinic P21/c, a = 12.777(4) Å, b = 10.514(2) Å, c = 14.971(3) Å, β = 107.40(2)°, V = 1919.2(8) Å3, Z = 4, R = 0.0611) show that the hydroxyl group has been selectively positioned at an axial site. The intramolecular hydrogen bond between the OH and C=O moiety exists (O(H). . .O = C, 2.83 Å for [PtIV(OOCMe)3(OH)(dmpda)]. H2O; 2.72 Å for [PtIV(OOCEt)3(OH)(dmpda)]. Formation of the axial-mono(hydroxo)tris(carboxylato)platinum(IV) species may be ascribed to a combination of 'reactive-equatorial effects' with 'cis-addition' in the carboxylic acid.
| Original language | English |
|---|---|
| Pages (from-to) | 710-713 |
| Number of pages | 4 |
| Journal | Transition Metal Chemistry |
| Volume | 29 |
| Issue number | 7 |
| DOIs | |
| State | Published - 2004.10 |
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