Coordination of bis(pyrazol-1-yl)amine to palladium(II): influence of the co-ligands and counter-ions on the molecular and crystal structures

Abstract

The crystal structures for five PdII complexes containing the tridentate ligand bis­[2-(3,5-di­methyl­pyrazol-1-yl)eth­yl]amine (pza) are reported. The co-ligand completing the square-planar coordination of the PdII centre influences the conformation of the pza ligand.

Coordination from Heteroscorpionate Ligand Towards Pd(II) via Pd⋅⋅⋅Hδ−C(sp3) Interaction: Structural and Catalytic Studies

“…The square‐base pyramid geometry of the metal center comprises two nitrogen and two halogen atoms (in cis positions) located in the basal plane while a hydrogen atom occupies the apical position. In general, the Pd−N pyrazole , Pd−Cl and Pd‐Br bond distances are in agreement with analogue palladium compounds reported in the literature [5,7,30–38] . The six membered chelate metallacycle formed due to the coordination of two nitrogen atoms of pyrazole rings towards the Pd(II) metal center adopts a boat conformation.…”

“…The square-base pyramid geometry of the metal center comprises two nitrogen and two halogen atoms (in cis positions) located In general, the PdÀ N pyrazole , PdÀ Cl and Pd-Br bond distances are in agreement with analogue palladium compounds reported in the literature. [5,7,[30][31][32][33][34][35][36][37][38] The six membered chelate metallacycle formed due to the coordination of two nitrogen atoms of pyrazole rings towards the Pd(II) metal center adopts a boat conformation. The Pd•••H δ À C( Those values are similar to those found in another ionic and neutral compounds CSD structures = BUJLUO, SEJVOV, MOVLIS and ULOTOE respectively.…”

Crystal structure of {bis[2-(3,5-dimethylpyrazol-1-yl-κN2)ethyl]amine-κN}chloridoplatinum(II) chloride dihydrate

“…For a pseudopolymorph of the Pd II complex, see: Guzei et al (2010). For other Pd II and Ni II complexes bearing the same bis(pyrazol-1-yl)amine ligand, see: Mendoza et al (2015); Ajellal et al (2006); Massoud et al (2012Massoud et al ( , 2013 Symmetry codes: (i) Àx þ 1; Ày; Àz þ 1; (ii) Àx; Ày; Àz þ 1.…”