Palladium(II) complexes supported by a bidentate bis(secondary)phosphine linked by pyridine
作者:Matthew S. Winston、John E. Bercaw
DOI:10.1016/j.ica.2014.08.002
日期:2014.10
A series of complexes of the type (PNP-H-2)PdX2 (X = Cl, Br, I) have been synthesized, where PNP-H-2 is a bis(secondary)phosphine ligand linked by a pyridine, 2,6-(2'-(Ph(H)P)(C6H4))(2)(C5H3N). Due to chirality at phosphorus, the parent ligand exists as a mixture of nearly equivalent rac and meso diastereomers noninterconverting at room temperature. When ligated to Pd(II) halides, however, the diastereomeric ratio is dependent upon the halide. The chloro, bromo, and iodo complexes have been characterized crystallographically. Conformationally similar meso diastereomers of each dihalide are roughly C-s symmetric in the solid state, while the rac diastereomers (identified only for X = Br, I) show substantially different solid-state conformations. (C) 2014 Elsevier B. V. All rights reserved.