Synthesis and Chloride Affinity of Sterically Demanding Ditopic Lithium Bis(pyrazol‐1‐yl)borates

Abstract

Abstract The synthesis and full characterization of the sterically demanding ditopic lithium bis(pyrazol‐1‐yl)borates Li 2 [ p ‐C 6 H 4 (B(Ph)pz R 2 ) 2 ] is reported (pz R = 3‐phenylpyrazol‐1‐yl ( 3 Ph ), 3‐ t ‐butylpyrazol‐1‐yl ( 3 t Bu )). Compound 3 Ph crystallizes from THF as THF‐adduct 3 Ph (THF) 4 which features a straight conformation with a long Li···Li distance of 12.68(1) Å. Compound 3 t Bu was found to function as efficient and selective scavenger of chloride ions. In the presence of LiCl it forms anionic complexes [ 3 t Bu Cl] − with a central Li‐Cl‐Li core (Li···Li = 3.75(1) Å).