TY - JOUR
T1 - Unraveling the Decomposition Process of Lead(II) Acetate
T2 - Anhydrous Polymorphs, Hydrates, and Byproducts and Room Temperature Phosphorescence
AU - Martinez, Francisco
AU - Ramos-Riesco, Miguel
AU - Rodríguez-Cheda, José A.
AU - Cucinotta, Fabio
AU - Matesanz, Emilio
AU - Miletto, Ivana
AU - Gianotti, Enrica
AU - Marchese, Leonardo
AU - Matej, Zdenek
PY - 2016/9/6
Y1 - 2016/9/6
N2 - Lead(II) acetate [Pb(Ac)2, where Ac = acetate group (CH3-COO-)2] is a very common salt with many and varied uses throughout history. However, only lead(II) acetate trihydrate [Pb(Ac)2·3H2O] has been characterized to date. In this paper, two enantiotropic polymorphs of the anhydrous salt, a novel hydrate [lead(II) acetate hemihydrate: Pb(Ac)2·1/2H2O], and two decomposition products [corresponding to two different basic lead(II) acetates: Pb4O(Ac)6 and Pb2O(Ac)2] are reported, with their structures being solved for the first time. The compounds present a variety of molecular arrangements, being 2D or 1D coordination polymers. A thorough thermal analysis, by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), was also carried out to study the behavior and thermal data of the salt and its decomposition process, in inert and oxygenated atmospheres, identifying the phases and byproducts that appear. The complex thermal behavior of lead(II) acetate is now solved, finding the existence of another hydrate, two anhydrous enantiotropic polymorphs, and some byproducts. Moreover, some of them are phosphorescent at room temperature. The compounds were studied by TGA, DSC, X-ray diffraction, and UV-vis spectroscopy.
AB - Lead(II) acetate [Pb(Ac)2, where Ac = acetate group (CH3-COO-)2] is a very common salt with many and varied uses throughout history. However, only lead(II) acetate trihydrate [Pb(Ac)2·3H2O] has been characterized to date. In this paper, two enantiotropic polymorphs of the anhydrous salt, a novel hydrate [lead(II) acetate hemihydrate: Pb(Ac)2·1/2H2O], and two decomposition products [corresponding to two different basic lead(II) acetates: Pb4O(Ac)6 and Pb2O(Ac)2] are reported, with their structures being solved for the first time. The compounds present a variety of molecular arrangements, being 2D or 1D coordination polymers. A thorough thermal analysis, by differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), was also carried out to study the behavior and thermal data of the salt and its decomposition process, in inert and oxygenated atmospheres, identifying the phases and byproducts that appear. The complex thermal behavior of lead(II) acetate is now solved, finding the existence of another hydrate, two anhydrous enantiotropic polymorphs, and some byproducts. Moreover, some of them are phosphorescent at room temperature. The compounds were studied by TGA, DSC, X-ray diffraction, and UV-vis spectroscopy.
UR - http://www.scopus.com/inward/record.url?scp=84986193753&partnerID=8YFLogxK
U2 - 10.1021/acs.inorgchem.6b01116
DO - 10.1021/acs.inorgchem.6b01116
M3 - Article
C2 - 27548299
AN - SCOPUS:84986193753
SN - 0020-1669
VL - 55
SP - 8576
EP - 8586
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 17
ER -