Mariko Hatamura, Shunro Yamaguchi, Shin-ya Takane, Yu Chen, Katuaki Suganuma
DALTON TRANSACTIONS, 44(19) 8993-9003, 2015 Peer-reviewed
A series of silver(I) beta-ketocarboxylates were prepared by reaction of beta-ketocarboxylic acids with silver nitrate in the presence of diethanolamine. The silver(I) beta-ketocarboxylates decomposed over a narrow temperature range to form metallic silver, CO2, and the corresponding ketones. In addition, products derived from radical intermediates were detected by mass spectroscopic analysis for some silver(I) beta-ketocarboxylates. Infrared and solid state C-13-NMR spectra of silver(I) beta-ketocarboxylates suggested the presence of two types of structures involving a carbonyl group in addition to the dimeric eight-membered ring structure as in the structure of silver(I) stearate. The silver(I) beta-ketocarboxylate model compound used was HCOCH2COOAg and its structures were determined using density functional theory (DFT) and atoms-in-molecules (AIM) methods. Three types of coordinations around the Ag ion differing significantly in Ag-O bond strengths were found. Based on the calculated structures and experimental results, the relationships between the structures and decomposition temperatures are discussed in terms of the thermal decomposition process.