Exploring the coordination chemistry and reactivity of hemilabile N-alkylaminopyrazole ligands towards Pd(II)
摘要:
Reaction of the N-alkylaminopyrazole (NN'N) ligands bis[(3,5-dimethyl-1-pyrazolyl)methyl]ethylamine (bdmae) and bis[(3,5dimethyl-1-pyrazolyl)methyl]isopropylamine (bdmai) with [PdCl2(CH3CN)(2)] in a 1:1 M/L ratio in CH2Cl2 produces cis-[PdCl2(NN'N)] (NN'N= bdmae (1), bdmai (2)). The solid state structure of complex 1 was determined by X-ray diffraction studies. The bdmae ligand is coordinated through the two N-pz atoms to the metal atom, which completes its coordination with two chlorine atoms in a cis disposition.Treatment of the corresponding ligand with [PdCl2(CH3CN)(2)] in 1: 1 M/L ratio in the presence of AgBF4 and metathesis with NaBPh4 in CH2Cl2/CH3OH (3:1) gave [PdCl(bdmae)](BPh4) (3), and in the presence of NaBPh4 in CH2Cl2/CH3CN (3:1) gave [PdCl(bdmai)](BPh4) (4). Complexes 1 and 2 were again obtained when complexes 3 and 4 were heated under reflux in a solution of Et4NCl in acetonitrile. These Pd(II) compounds were characterised by elemental analyses, conductivity measurements, IR, H-I and C-13{H-1} NMR, HMQC and NOESY spectroscopies. The NMR studies of the complexes prove the rigid conformation of the ligands when they are complexed. (c) 2006 Elsevier B.V. All rights reserved.
Exploring the coordination chemistry and reactivity of hemilabile N-alkylaminopyrazole ligands towards Pd(II)
摘要:
Reaction of the N-alkylaminopyrazole (NN'N) ligands bis[(3,5-dimethyl-1-pyrazolyl)methyl]ethylamine (bdmae) and bis[(3,5dimethyl-1-pyrazolyl)methyl]isopropylamine (bdmai) with [PdCl2(CH3CN)(2)] in a 1:1 M/L ratio in CH2Cl2 produces cis-[PdCl2(NN'N)] (NN'N= bdmae (1), bdmai (2)). The solid state structure of complex 1 was determined by X-ray diffraction studies. The bdmae ligand is coordinated through the two N-pz atoms to the metal atom, which completes its coordination with two chlorine atoms in a cis disposition.Treatment of the corresponding ligand with [PdCl2(CH3CN)(2)] in 1: 1 M/L ratio in the presence of AgBF4 and metathesis with NaBPh4 in CH2Cl2/CH3OH (3:1) gave [PdCl(bdmae)](BPh4) (3), and in the presence of NaBPh4 in CH2Cl2/CH3CN (3:1) gave [PdCl(bdmai)](BPh4) (4). Complexes 1 and 2 were again obtained when complexes 3 and 4 were heated under reflux in a solution of Et4NCl in acetonitrile. These Pd(II) compounds were characterised by elemental analyses, conductivity measurements, IR, H-I and C-13{H-1} NMR, HMQC and NOESY spectroscopies. The NMR studies of the complexes prove the rigid conformation of the ligands when they are complexed. (c) 2006 Elsevier B.V. All rights reserved.