Abstract
New coordination polymers based on two metal-containing moieties Ru–Ag are synthesized: Na[RuCpX(PTA)-μ-(PTA)-1κP:2κ2N-AgX2]∞ (X = Cl (1), Br (2), I (3)). Characterization is performed by NMR, UV-visible and FT-IR spectroscopy, optical-electron microscopy, and elemental analyses (C, H, N, S). Light scattering is employed to characterize the colloidal particles growth by polymer self-assembling. These structures are stable over a broad range of pH and exhibit thermally-driven swelling, thus resembling a typical thermosensitive hydrogel.
Highlights
The coordination chemistry of metal complexes containing 1,3,5 triaza-7-phosphaadamantane (PTA) has received great interest in recent years
The goal of the present paper is to report a new strategy of synthesis that overcomes the previous difficulties and is able to lead to three new heterometallic polymers
The Ru–Ag heterometallic polymers were synthesized by reaction of the [RuCpX(PTA)2 ] complex with AgOTf and NaX in water (Figure 1)
Summary
The coordination chemistry of metal complexes containing 1,3,5 triaza-7-phosphaadamantane (PTA) has received great interest in recent years. The attractiveness of such ligand arises from its strong binding capability as well as its unusual solubility in water. PTA ligands traditionally coordinate metals through the phosphorus atom. During last years, bounding of PTA ligands to boron or transition metals through the nitrogen atoms has been explored and as a consequence of that, a new family of metal–organic polymers in which PTA ligands link the metal centers through both phosphorus and nitrogen atoms was synthetized [1,2]. In 2005, the first example of metal-backbone polymer containing the PTA ligand for [{CpRu(PTA) (DMSO-kS)}{AgCl2 }]∞ was reported, being the first case of hydro-soluble polymer bearing organometallic units [1].
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