Synthesis, Characterization, and PGSE (1H and 19F) NMR Diffusion Studies on Cationic (η6- Arene)Mn(CO)3+ Complexes: Boron Counterion, Ion Pairing, and Solvent Dependences
摘要:
The synthesis, characterization, and PGSE (H-1 and F-19) NMR diffusion studies on the cationic [(eta(6)-arene)Mn-(CO)(3)][X] (arene = anisole, 4-chloroanisole, and 1,3,5-trimethoxybenzene; X = BPh4 and BArF) are reported. The tetraphenyl borate complexes of anisole and 4-chloroanisole show surprisingly strong ion pairing in dichloromethane solution, whereas the BArF salts do not. H-1,H-1-NOESY data support this anion selectivity. In chloroform solution one finds the usual strong ion pairing for both anions. The solid-state structure of [(eta(6)-1,3,5-trimethoxybenzene)-Mn(CO)(3)][BPh4] has been determined. C-13 NMR and IR data for the new complexes are reported. The observed IR frequencies are higher for the BArF complexes than for the BPh4 complexes.
Synthesis, Characterization, and PGSE (1H and 19F) NMR Diffusion Studies on Cationic (η6- Arene)Mn(CO)3+ Complexes: Boron Counterion, Ion Pairing, and Solvent Dependences
摘要:
The synthesis, characterization, and PGSE (H-1 and F-19) NMR diffusion studies on the cationic [(eta(6)-arene)Mn-(CO)(3)][X] (arene = anisole, 4-chloroanisole, and 1,3,5-trimethoxybenzene; X = BPh4 and BArF) are reported. The tetraphenyl borate complexes of anisole and 4-chloroanisole show surprisingly strong ion pairing in dichloromethane solution, whereas the BArF salts do not. H-1,H-1-NOESY data support this anion selectivity. In chloroform solution one finds the usual strong ion pairing for both anions. The solid-state structure of [(eta(6)-1,3,5-trimethoxybenzene)-Mn(CO)(3)][BPh4] has been determined. C-13 NMR and IR data for the new complexes are reported. The observed IR frequencies are higher for the BArF complexes than for the BPh4 complexes.