Synthesis, characterization and crystal structures of monocyclopalladated and biscyclopalladated 1,1′-bisferrocenylpyrimidine–monophosphine complexes
摘要:
A new 1,1'-bisferrocenylpyrimidine ligand [{(eta(5)-C5H4)-N2C4H-2CH(3)}(2)Fe] 1 was conveniently prepared via the coupling reaction of 1,1'-dichloromercuriferrocene and 4,6-dimethyl-2-iodopyrimidine, and its monophosphine-palladacycle complexes 2-3 were also readily obtained from the cyclopalladation reactions and bridge-splitting reactions. These compounds have been characterized by H-1 NMR, IR, ESI-MS, and elemental analysis. The complex 2 was found to be a biscyclopalladated complex, while the complex 3 was a monocyclopalladated complex. Additionally, their detailed structures have been determined by X-ray single-crystal diffraction. The most striking common feature of the structures of 2-3 is intermolecular C-H center dot center dot center dot Cl hydrogen bonds, which are attributed to construct the 1D chain structures. (C) 2010 Elsevier B.V. All rights reserved.