Abstract
The reaction of 2,6-(2-{Me 2NCH 2}C 6H 4) 2C 6H 3I ( 2) with Pd 2(dba) 3 produced the NCN diamine pincer complex [2,6-(2-Me 2{NCH 2}C 6H 4) 2C 6H 3PdI] ( 3) by an oxidative addition route. The structural analysis of ligand precursor 2 revealed a syn-conformation in the solid state. Single crystal X-ray analysis of complex 3 revealed a conventional square planar geometry about the palladium center and a global C 2 symmetric structure. Variable temperature and concentration NMR spectroscopic studies of complex 3 suggest an equilibrium between 3 and the dinuclear species [{2,6-(2-{Me 2NCH 2}C 6H 4) 2C 6H 3Pd} 2μ 2-I]I in CDCl 3 solution. An unusual carbonate complex [{2,6-(2-{Me 2NCH 2}C 6H 4) 2C 6H 3Pd} 3μ 3-CO 3]I 3 ( 4) was also structurally characterized as a minor product during synthesis of 3.
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