摘要:
[Pd(dppf)(MeCN)(2)](OTf)(2) [dppf = 1,1'-bis(diphenylphosphino)ferrocene, OTf = triflate] reacts with pyridyl acetic acid (PyA-cOH) to yield a dipalladium ring structure, [Pd-2(dppf)(2)(mu-PyOAc)(2)](OTf)(2) (1). The doubly-bridging ligands exhibit basicity at the pendant carboxyl oxygen to attract AgX (X = OTf or CF3CO2) to form [Pd2Ag2(dppf)(2)(PyOAc)(2)(OTf)4] (2) and [Pd2Ag2(dppf)(2) (PyOAc)(2)(OTf)(2)(CF3CO2)(2)](3), respectively. Complexes 1 and 2 have been crystallographically characterized. Similar spacer guest affinity is not found in the Pt(II) or isonicotinate analogues. (c) 2005 Elsevier B.V. All rights reserved.