• Lang, H.
• Hausner, S.
• Hausner, Susann
• Frenzel, P.
• Frenzel, Peter
• Wagner, G.
• Korb, M.
• Lang, Heinrich
• Wagner, Guntram

Abstract

<p>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 Ag-C, C-C and C-O 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 [Cu-2(O2CCMe2OC(O)OMe)(4).2H(2)O] (12) was formed. Therefore, only 6-EG and 6-DEG were used for pressureless joining of Cu at 250 degrees C. Thru addition of Ag mu m-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. (C) 2018 Published by Elsevier B.V.</p>

Topics

• impedance spectroscopy
• single crystal
• silver
• strength
• mass spectrometry
• copper
• thermogravimetry
• differential scanning calorimetry
• decomposition
• joining