Complexes of the [Re(6)(mu(3)-Se)(8)](2+) core-containing clusters with the water-soluble 1,3,5-triaza-7-phosphaadamantane (PTA) ligand: unexpected ligand protonation and related studies

Xiaoyan Tu; Gary S Nichol; Ruiyao Wang; Zhiping Zheng

doi:10.1039/b806888g

Complexes of the [Re(6)(mu(3)-Se)(8)](2+) core-containing clusters with the water-soluble 1,3,5-triaza-7-phosphaadamantane (PTA) ligand: unexpected ligand protonation and related studies

Dalton Trans. 2008 Nov 21:(43):6030-8. doi: 10.1039/b806888g. Epub 2008 Sep 22.

Authors

Xiaoyan Tu¹, Gary S Nichol, Ruiyao Wang, Zhiping Zheng

Affiliation

¹ Department of Chemistry, The University of Arizona, Tucson, Arizona 85721, USA.

PMID: 19082060
DOI: 10.1039/b806888g

Abstract

Three new complexes of the [Re(6)(mu(3)-Se)(8)](2+) core-containing clusters with the water-soluble trialkylphosphine ligand 1,3,5-triaza-7-phosphaadamantane (PTA), [Re(6)(micro(3)-Se)(8)(PEt(3))(5)(PTA)](SbF(6))(2) (P5PTA, ), [Re(6)(micro(3)-Se)(8)(PEt(3))(5)(PTAH)][Re(6)(micro(3)-Se)(8)(PEt(3))(5)(PTA)](SbF(6))(5) (), and [Re(6)(micro(3)-Se)(8)(PEt(3))(5)(PTAH)](2)(HBr)(SbF(6))(2)Br(4) () have been prepared and structurally characterized. Unexpected protonation of the cluster-bound PTA ligand was observed when coordination of with HgI(2) was attempted, affording compound featuring a protonated PTA ligand, PTAH. Deliberate acidification of with HBr produced compound , and the protonation was investigated by using (31)P NMR spectroscopy. Crystallographic studies revealed distinct structural distortions of the ligand as a result of protonation.