Conversion of methacrylate into 2-hydroxy-2-methylpropionate ligands in the coordination sphere of a Ag–Zr oxo cluster

Abstract

Reaction of Zr(O(n)Bu)4 and silver acetate with methacrylic acid afforded a mixed-metal cluster with a Ag2Zr8O6 core and both methacrylate and 2-hydroxy-2-methylpropionate ligands.

Crown‐Ether‐Like Structures Derived from a Ti8O8(Carboxylate)16 Metallacycle

“…We have recently published a first example in which the second metal (in this case, Ag) was introduced through a metal carboxylate instead of a metal alkoxide. [11] When extending this approach to the main-group metals strontium and lead, we obtained Ti/Sr and Ti/Pb mixed-metal clusters with interesting structures, which are derived from the well-known Ti 8 O 8 (carboxylate) 16 metallacycles. In 2 and 3, the structure of the base compound Ti 8 O 8 (methacrylate) 16 (1) is retained, although the ring is puckered by coordination to two Sr or Pb atoms.…”

“…Water is produced by ester formation between the employed carboxylic acid and the alcohol eliminated by the substitution reaction. We have recently published a first example in which the second metal (in this case, Ag) was introduced through a metal carboxylate instead of a metal alkoxide 11…”

“…The Sr(1A)-O distances in 2 b are spread over a wider range (2.149(12)-2.976(11) ) than those of 2 a (2.491(3)-2.601(3) ). The largest distance of 2.976 (11) is that of the other bridging acetate ligand (Sr(1A')-O(5)), that is, the (2). Disordered parts are drawn with broken bonds.…”

Hybrid Materials Based on the Embedding of Organically Modified Transition Metal Oxoclusters or Polyoxometalates into Polymers for Functional Applications: A Review

“…In the last years, the synthesis of different early transition metal and main/transition group metal polynuclear complexes (with O–M–O moieties) were extensively explored, resulting in oxoclusters based on Zr [158–161], Hf [162], Ti and Ti-Zr [139,158,163], Ag-Zr [164], Y, Ti-Hf [162], Zr-Ti-Hf [162], Ba [151], Ba-Ti [151], Ti-Pb and Ti-Sr [165], Ti-Y [166], Nb [167], Sn [120,168–176]. Since the 1990s, Hubert-Pfalzgraf et al [167,177–180] have paved the way to this development by exploring original routes for the synthesis of a plethora of mono- and polymetallic (e.g., Pb-Zr, Pb-Ti, Cu-Y, lanthanides, La-Zn, Ba-Ce, and others) mixed alkoxides and oxoclusters as potential single-source precursors for the corresponding mixed functional oxides (e.g., perovskites).…”

“…Coming to the topic of this paper, and concerning the above mentioned nature of the functionalization, in the literature are reported, inter alia , oxoclusters which have been functionalized with acrylates or methacrylates [158–164,182,185–187] for free radical polymerization, norbornene-2-carboxylate derivatives for ring-opening metathesis polymerization [125], 4-pentynoate derivatives for click reactions [188], 2-bromo-isobutyrate derivatives as initiator for atom-transfer radical polymerization [189], and thiol carboxylate-substituted metal oxocluster for thiol-ene polymerization [142,190]. …”