Abstract
The synthesis of [AgO2CCR2OC(O)OMe] (6, R = H; 7, R = Me) by treatment of HO2CCR2OC(O)OMe (4, R = H; 5, R = Me) with [AgNO3] in presence of NEt3 is reported. The reaction of 6 and 7 with 2 equiv of PPh3 gave [AgO2CCR2OC(O)OMe(PPh3)2] (8, R = H; 9, R = Me). The thermal behavior of 6 and 7 was studied by TG, DSC and TG-MS of which the latter evinced decarboxylation as initial decomposition step followed by AgC, CC and CO bond cleavages giving silver. For copper-to-copper joining, 6 and 7 were processed to spreadable pastes by mixing them with ethylene glycol (EG) or diethylene glycol (DEG). On contact of 7-EG with Cu sheets [Cu2(O2CCMe2OC(O)OMe)4·2H2O] (12) was formed. Therefore, only 6-EG and 6-DEG were used for pressureless joining of Cu at 250 °C. Thru addition of Ag µm-particles a tensile shear strength of 19 MPa was achieved, showing a significant higher value as received with commercially Ag nanopastes. The solid state structure of 5, 8, 9 and 12 was determined by single crystal X-ray structure analysis, showing [3+1] (P2O + O) (8), distorted tetrahedral (9) or octahedral (12) coordination spheres at the metal ion.
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