Add time:09/26/2019         Source:sciencedirect.com

The reaction of Zn(O2CtBu)2 with 4-(dimethylamino)pyridine (DMAP) in 1:2 and 1:1 mol ratios afforded [Zn(O2CtBu)2(DMAP)2]·H2O (1·H2O) and [Zn5(μ3-OH)2(O2CtBu)2(μ2-κ1O:κ1O′-O2CtBu)6(DMAP)2] (2) in 95% and 98% yields, respectively. Complex 1·H2O upon crystallization from CHCl3/n-hexane mixture at ambient temperature afforded 1·CHCl3 in 77% yield. Complex 2 upon re-crystallization in a CH2Cl2/n-hexane mixture or CDCl3 at ambient condition afforded a unique pentanuclear complex, [Zn5(μ3-OH)2(O2CtBu)(κ2O,O′-O2CtBu)(μ2-κ1O:κ1O′-O2CtBu)6(DMAP)2] (3) in 98% yield. Complex 3 upon re-crystallization in methanol transformed back to 2. The new complexes were characterized by elemental analysis, TGA/DTA/DSC analysis, FT-IR, NMR (solution 1H and 13C, and solid state CP-MAS) spectroscopy, and selected complexes were characterized by single crystal X-ray diffraction. The molecular structures of 2 and 3 represent a crystallographic snapshot of a monodentate ↔ chelating ‘carboxylate shift’ process. Variable temperature 1H NMR measurements carried out on 2 in methanol-d indicated the presence of two species, possibly 2 and 3, in about a 2:1 ratio, respectively at 198 K suggesting the aforementioned ‘carboxylate shift’ process operating in solution. Various factors that are responsible for the ‘carboxylate shift’ process are discussed.

We also recommend Trading Suppliers and Manufacturers of zinc pivalate (cas 15827-10-8). Pls Click Website Link as below: cas 15827-10-8 suppliers