Neutral mononuclear luminescent Pd(II) complexes with heterocyclic thiolate ligands and chelating phosphines. Structural and photophysical assignments
作者:P.A. Papanikolaou、A.G. Papadopoulos、A. Hatzidimitriou、P. Aslanidis
DOI:10.1016/j.poly.2015.04.007
日期:2015.7
Two heterocyclic thiolate ligands, namely pymt and py2S (pymt = pyrimidine2-thiolate and py2S = pyridine-2-thiolate) and the diphosphines bis(diphenylphosphino)methane (dppm), 1,2-bis (diphenylphosphino)ethane (dppe), 1,3-bis(diphenylphosphino)propane (dppp), were used in the synthesis of three neutral Pd(II) complexes (cis-[Pd(dppm)(pymt)(2)] (1), cis-[Pd(dppe)(pymt)(2)] (2) and cis-[Pd(dppp)(pyrt)(2)] (3)). Crystallographic analysis of the isolated complexes reveals their square planar arrangement and the coordination of the thiolate moieties through their exocyclic sulfur atom. The complexes absorb in the visible part of the spectrum through charge transfer transitions while after photoexcitation at 385 nm they appear to emit with a broad band located at 465 nm. (C) 2015 Elsevier Ltd. All rights reserved.