Water-Soluble Ruthenium(II) Carbonyls with 1,3,5-Triaza-7-phosphoadamantane

As a continuation of our strategy for preparing new Ru(II) precursors with improved water solubility through the introduction of highly water-soluble 1,3,5-triaza-7-phosphoadamantane (PTA) supporting ligands in the coordination sphere, in this work, we address the largely unexplored preparation of Ru(II)–PTA carbonyls. Two complementary synthetic approaches were used: (1) the treatment of a series of neutral Ru(II)–CO–dmso compounds of general formula RuCl2(CO)n(dmso)4–n (n = 1–3, 1–5) with PTA; (2) the reaction of Ru(II)–PTA complexes with CO. Through the first approach, we obtained and fully characterized seven novel neutral compounds bearing from one to three PTA ligands per Ru atom, namely, the four monocarbonyls, cis,cis,trans-RuCl2(CO)(dmso–S)(PTA)2 (6), trans-RuCl2(CO)(PTA)3 (7), cis,mer-RuCl2(CO)(PTA)3 (8), and trans,trans,trans-RuCl2(CO)(OH2)(PTA)2 (10), and the three dicarbonyls, trans,trans,trans-RuCl2(CO)2(PTA)2 (11), [RuCl2(CO)2(PTA)]2 (12), and cis,cis,trans-RuCl2(CO)2(PTA)2 (13). The less s...