A unique series of chromium(iii) mono-alkynyl complexes supported by tetraazamacrocycles

Abstract

Aiming for donor–bridge–acceptor dyads based on dissymmetric bis-alkynyl CrIII complexes, a high yield synthetic route for mono-alkynyl CrIII complexes has been developed.

A S=3/2 Cr(III) Complex In A Square‐Capping NHC Framework

“…[55,56] In light of these applications we were curious as to the ability of 1 to serve as a synthon to form a new σ-bond via a salt metathesis reaction with LiC 2 Ph. We reasoned this substrate a good choice to evaluate the electrophilic reactivity of 1 as lithium phenylacetylide is readily prepared, [57] phenlacetylide complexes of Cr are known to the crystallographic record, [58][59][60][61][62][63][64][65][66][67][68][69] and the steric demands of the square-capping pentadentate NHC ought not prohibit access by the phenylacetylide anion. We observed no change to the paramagnetic 1 H NMR spectrum over the course of 24 hr upon charging a J-young NMR tube with 1 and 1.2 equivalents of lithium phenylacetylide using THF-d8 solvent.…”