Date Published: May 01, 2009
Publisher: International Union of Crystallography
Author(s): Xiao-Qin Zhang, Mei-Ming Luo.
The coordination geometry of the Pd atom in the title compound, [Pd(SCN)2(C46H54N4O6)], is approximately square-planar. The N-heterocyclic carbene (NHC) metallacrown ether ligand binds to the Pd atom in a trans orientation through the carbene C atoms of the two imidazole rings and generates a 25-membered chelate ring. Two mutually trans S-bound thiocyanate ligands complete the coordination.
For N-heterocyclic carbene ligands and their complexes, see: Herrmann (2002 ▶); Hahn & Jahnke (2008 ▶). For details of bis-phosphine polyether ligands, see: Alcock et al. (1976 ▶); Powell et al. (1981 ▶); Gray et al. (1995 ▶). For mixed NHC metallacrown ether ligands, see: Nielsen et al. (2003 ▶); Liu et al. (2007 ▶); Wang et al. (2005 ▶). For the use of Pd–NHC complexes in catalysis, see: Herrmann et al. (2002 ▶); Kantchev et al. (2007 ▶). For the synthesis of the ligand precursor, see: Pedersen (1967 ▶); Haque & Rasmussen (1994 ▶).