Abstract
A family of cationic and neutral highly water-soluble rhodium complexes [Cp∗Rh(PTA) 3]Cl 2 ( 1), [Cp∗RhCl 2(THP)] ( 2), [Cp∗RhCl(THP) 2]Cl ( 3), and [Cp∗RhCl(PTA)(THP)]Cl ( 4) have been synthesised and fully characterised [PTA = 1,3,5-triaza-7-phosphaadamantane; THP = tris(hydroxymethyl)phosphine]. Their water-solubility increases as the number of the phosphines coordinated to the metal centre is increased. The X-ray crystal structure of compound 2 was obtained and shows the presence of intermolecular hydrogen bonding. NMR speciation studies of [Cp∗RhCl 2(PTA)] in deuterated water show the existence of several equilibria involving substitution processes in which the water molecules can substitute both chloride and PTA ligands.
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