The bonding strength of Ag+(C2H4) and Ag+(C2H4)2 complexes

✍ Scribed by B.C. Guo; A.W. Castleman Jr.

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 462 KB
• Volume: 181
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(91)90214-t

✦ Synopsis

The association reactions Ag+(C2H4)._, +C2H,=Ag+ (C,H,),(n= 1 or 2) were studied using high pressure mass spectrometty (HPMS). Theenthalpyand entropychangesdeterminedare -AH"=32.4 kcal/mol, and -A5"=30.2 cal/molKfor then=2 reaction. In the case of the n= I reaction, the Gibbs free energy change at 750 K 1s measured to be -AGO= 17.1 kcal/mol. Using the free energy change and the calculated entropy change -AS0=22.1 cal/mol K, we derive an enthalpy change -AH'=33.7 kcal/mol for the n= I reaction. The bonding in both .4g+(C2H,) and Ag*(C2H,)2 complexes IS extremely strong, and much higher than expected based on the simple electrostatic-interaction considerations. The strong bonding suggests that covalent interaction or a two-way donor-acceptor interaction dominates in the complexes.