title: 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.
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.
authors.affiliation: Laboratory of Inorganic Chemistry, ETHZ, Hönggerberg Zürich, Switzerland.
authors.forename: Daniele
authors.initials: D
authors.lastname: Schott
authors.forename: Paul S
authors.initials: PS
authors.lastname: Pregosin
authors.forename: Béatrice
authors.initials: B
authors.lastname: Jacques
authors.forename: Murielle
authors.initials: M
authors.lastname: Chavarot
authors.forename: Françoise
authors.initials: F
authors.lastname: Rose-Munch
authors.forename: Eric
authors.initials: E
authors.lastname: Rose