The exchange of acetonitrile on iron(II) in acetonitrile solvent. A nitrogen-14 nuclear magnetic resonance study

1971 ◽  
Vol 24 (6) ◽  
pp. 1169 ◽  
Author(s):  
RJ West ◽  
SF Lincoln
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Exchange Reaction ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Rate Law ◽  
Nuclear Magnetic

A 14N n.m.r. study of the exchange reaction Fe(CH3CN)62+ ╲ CH3CN in CH3CN solvent is reported. The value for k 1 (25°C) from the rate law R = 6k1[Fe(CH3CN)62+] is (5.5 ± 0.8) × 105 s-1, ΔH‡ = 9.7 ± 0.7 kcal mol-1, ΔS‡ = 0.3 ± 2.2 cal mol-1 K-1, and A/h = 5.0 × 106 Hz. These data are compared with those of related systems.

A 19F nuclear magnetic resonance study of the exchange of the fluoro ligands of the tetrafluoroberyllium(II) ion

1977 ◽  
Vol 30 (2) ◽  
pp. 271 ◽  
Author(s):  
SF Lincoln ◽  
AC Sandercock ◽  
DR Stranks
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Exchange Rate ◽  
Magnetic Resonance ◽  
Exchange Process ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Rate Law ◽  
The Exchange Rate ◽  
Nuclear Magnetic

A 19F N.M.R. study is reported of the exchange of the fluoro ligands of [BeF4]2-. The exchange rate law is: ����������� rate = kobs4[BeF42-] = k'4[BeF42-]+ k''4[BeF42-][BeF3H2O-] where k'(298 K) = 69�3 s-1, ΔH‡ = 30�3 kJ mol-1, ΔS‡ = -110�10 J mol-1 K-1 and k''(298 K) = (1.6�0.5)×103 dm3 mol-1 s-1, ΔH‡ = 26�3 kJ mol-1, ΔS‡ = - 96�9 J mol-1 K-1. The k' exchange process appears to be predominantly dissociative in nature, and the k'' exchange process apparently proceeds through a fluoro bridged species [Be2F7]2-.

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