Synthesis, characterization, and PGSE (1H and 19F) NMR diffusion studies on cationic (eta6- arene)Mn(CO)3+ complexes: boron counterion, ion pairing, and solvent dependences

Daniele Schott; Paul S Pregosin; Béatrice Jacques; Murielle Chavarot; Françoise Rose-Munch; Eric Rose

doi:10.1021/ic0506409

Synthesis, characterization, and PGSE (1H and 19F) NMR diffusion studies on cationic (eta6- arene)Mn(CO)3+ complexes: boron counterion, ion pairing, and solvent dependences

Inorg Chem. 2005 Aug 8;44(16):5941-8. doi: 10.1021/ic0506409.

Authors

Daniele Schott¹, Paul S Pregosin, Béatrice Jacques, Murielle Chavarot, Françoise Rose-Munch, Eric Rose

Affiliation

¹ Laboratory of Inorganic Chemistry, ETHZ, Hönggerberg Zürich, Switzerland.

PMID: 16060650
DOI: 10.1021/ic0506409

Abstract

The synthesis, characterization, and PGSE ((1)H and (19)F) NMR diffusion studies on the cationic [(eta(6)-arene)Mn(CO)(3)][X] (arene = anisole, 4-chloroanisole, and 1,3,5-trimethoxybenzene; X = BPh(4) 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. (1)H,(1)H-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)][BPh(4)] has been determined. (13)C NMR and IR data for the new complexes are reported. The observed IR frequencies are higher for the BArF complexes than for the BPh(4) complexes.