Transformations of the Vaska-type complex trans-[RhCl(CO)(PTA)2] (PTA=1,3,5-triaza-7-phosphaadamantane) during stepwise addition of HCl: Synthesis, characterization and crystal structure of trans-[RhCl2(PTA)(PTAH)]
摘要:
The new aqua-soluble rhodium(I) complex trans-[RhCl2(PTA)(PTAH)] (1) {PTAH = N-protonated form of 1,3,5-triaza-7-phosphaadamantane (PTA)} has been synthesized via the reaction of trans[ RhCl(CO)(PTA)(2)] with aqueous HCl or N-chlorosuccinimide, or by the treatment of RhCl3 with PTA. Compound 1 has been characterized by IR, H-1 and P-31{H} NMR spectroscopies, ESI-MS(+), elemental and single crystal X-ray diffraction analyses, the latter showing a square planar {RhCl2P2} geometry. Besides, the stepwise addition of diluted HCl to an aqueous solution of trans-[RhCl(CO)(PTA)(2)] has been monitored by P-31{H-1} NMR and ESI-MS(+) techniques, allowing to detect a number of intermediate Rh(I) species. (C) 2011 Elsevier B.V. All rights reserved.