Facile synthesis and characterization of μ-chloro, azido, thiocyanato bridged cyclometallated Pd(II) containing Schiff-base ligands

Jiang, Yuchun; Guo, Yonglin; Zhu, Xinglong; Song, Dandan; Wang, Yu; Song, Xi‐Ming; Verpoort, Francis; Chang, Xiaohong

doi:10.1016/j.ica.2011.06.003

Cited by 19 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The difference observed between the bond lengths, possibly reflecting the different trans effects of the phosphorus and nitrogen atoms. The PdAN azide bond distance (2.094(8) Å) is within the normal range observed in the corresponding distance reported in other palladacyclic azide complexes [37,40].…”

Section: Molecular Structure Of 1bsupporting

confidence: 84%

“…The formation of 1 was readily confirmed by a characteristic stretching vibration band at 2052 cm À1 assigned to the bridged N 3 group [37]. 31 In the FT-IR spectra of 1a and 1b, a strong stretching vibrations were observed at 2026 and 2032 cm À1 due to the terminal azide group, respectively, which were shifted to lower wavenumber compared to the bridging azide group present in the starting material (2052 cm À1 ) [40].…”

Section: Synthesis and Spectroscopic Characterizationmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, spectral characterization, crystal structure and in vitro DNA/protein binding studies of phosphorous ylide palladacyclic complexes containing azide group

Karami

Shirani-Sarmazeh

Hosseini-Kharat

et al. 2015

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

Section: Molecular Structure Of 1bsupporting

confidence: 84%

Section: Synthesis and Spectroscopic Characterizationmentioning

confidence: 99%

Synthesis, spectral characterization, crystal structure and in vitro DNA/protein binding studies of phosphorous ylide palladacyclic complexes containing azide group

Karami

Shirani-Sarmazeh

Hosseini-Kharat

et al. 2015

Journal of Photochemistry and Photobiology B: Biology

View full text Add to dashboard Cite

“…The IR spectra of the nickel complexes 2e‐2i show the characteristic absorption bands related to the naphthoxy‐imine ligands. Particularly, these IR spectra showed the absorption bands at 1615–1624 cm −1 corresponding to the coordinated HC=N unit of the ligands ( 1e‐1i ) …”

Section: Resultsmentioning

confidence: 99%

“…Elemental analyses of complexes 2a‐d are in agreement with the formation of nickel complexes of general formula Ni{ZNO}Br , and ESI‐HRMS results indicated the formation of [M + H] + ions. The IR spectra of the nickel complexes showed the absorption bands at 1607–1624 cm −1 corresponding to the coordinated HC=N unit of the pro‐ligands ( 1a‐d ) . To explore the steric and possible electronic influence of naphthoxy moiety on selectivity and oligomer distribution, a set of five pro‐ligands was targeted.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of Ni (II) complexes supported by phenoxy/naphthoxy‐imine ligands with pendant N‐ and O‐donor groups and their use in ethylene oligomerization

Oliveira

Silva

Casagrande

et al. 2018

Applied Organom Chemis

View full text Add to dashboard Cite

A series of new Ni(II) complexes of general formula Ni{ZNO} Br (2a‐i) (ZNO = phenoxy/naphthoxy‐imine with pendant N‐ and O‐donor groups) were prepared and characterized by elemental analysis, IR spectroscopy, ESI‐HRMS, and by X‐ray crystallography for 2e. In the solid state, 2e features a monomeric structure with κ3 coordination of the monoanionic naphthoxy‐imine‐quinoline ligand onto the nickel center. Upon activation with MAO, both classes of nickel catalysts were able to produce selectively 1‐butene (81.5–92.1 wt%) with turnover frequencies (TOFs) varying from 3,100 to 24,300 mol(C2H4) mol (Ni)−1 h−1. Nickel precatalysts bearing phenoxy‐imine ligands were much more active than its naphthoxy analogous under the same conditions. The use of a mixture of cocatalysts (MAO/TMA or MAO/TiBA) resulted in poor activities; however the presence of TiBA in the milieu led to a significant improvement on selectivity for 1‐hexene (25.5 wt%). Under optimized conditions ([Ni] = 10 μmol, 30 °C, oligomerization time = 5 min, 20 bar ethylene, [Al]/[Ni] = 600), precatalyst 2c led to TOF = 59,900 mol(C2H4) mol(Ni)−1 h−1 and selectivity for 1‐butene of 89.5 wt%.

show abstract

“…The synthesis of phosphide-bridged Pd(II) complexes was reported first in 1962, and they have been studied extensively since then . However, applications of phosphide-bridged Pd(II) complexes are sparse, likely because of the challenges in their synthesis due to the handling and sourcing problems associated with hydrophosphines. , The azide-bridged Pd(II) complexes have also been known since 1968 with a variety of supporting ligands, which include phosphines, π-allyl ligands, imines, and pyridine . However, all of them form a Pd 2 N 2 four-membered ring with azide ligands via the side-on approach, and no other coordination modes are known.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structure of Multinuclear Pd(II) Complexes Bridged by Phosphide or Azide Ligands

Takeuchi

Kim

et al. 2020

ACS Omega

View full text Add to dashboard Cite

The synthesis and structure of phosphide- and azide-bridged multinuclear Pd(II) complexes bearing phosphine ligands [PdX(μ-X′)(PR3)] n (X = Cl and N3; X′ = PR2 ′ and N3; n = 2 and 4) are reported. The oxidative addition of R2 ′PCl to Pd(PMe3)2 furnished the phosphide-bridged dinuclear Pd(II) complexes [PdCl(μ-PR2 ′)(PMe3)]2 [R′ = i Pr (1a) and Cy (1b)]. However, the oxidative addition of (o-tolyl)2PCl to Pd(PMe3)2 produced a nonbridged mononuclear Pd(II) complex with the bis(o-tolyl)phosphinic ligand, trans-[Pd(PMe3)2{P(O)(o-tolyl)2}] (2), via oxidation of the phosphinyl ligand. The reaction of the chloride-bridged dinuclear Pd(II) complexes [PdCl(μ-Cl)(PR3)]2 [PR3 = PEt3 (3a) and PPhMe2 (3b)] with NaN3 afforded the azide-bridged dinuclear and tetranuclear Pd(II) complexes [Pd(N3)(μ-N3)(PEt3)]2 (4) and [Pd(N3)(μ-N3)(PPhMe2)]4 (5). Comparisons of the X-ray structures of 4 and 5 show that the square-planar molecular geometry of the Pd(II) centers of 4 are more distorted than those of 5. Density functional theory calculations suggest that the tetranuclear eight-membered ring structure like 5 is more stable than the dinuclear four-membered ring structure like 4 in the gas phase in both PEt3 and PPhMe2 systems. However, because the relative energy difference between the four-membered and eight-membered ring structures is small in the PEt3 system with smaller steric hindrance compared with PPhMe2, it is assumed that this difference is compensated by the crystal packing energy, and the dinuclear four-membered ring complex 4 is actually obtained.

show abstract

Facile synthesis and characterization of μ-chloro, azido, thiocyanato bridged cyclometallated Pd(II) containing Schiff-base ligands

Cited by 19 publications

References 27 publications

Synthesis, spectral characterization, crystal structure and in vitro DNA/protein binding studies of phosphorous ylide palladacyclic complexes containing azide group

Synthesis, spectral characterization, crystal structure and in vitro DNA/protein binding studies of phosphorous ylide palladacyclic complexes containing azide group

Synthesis and characterization of Ni (II) complexes supported by phenoxy/naphthoxy‐imine ligands with pendant N‐ and O‐donor groups and their use in ethylene oligomerization

Synthesis and Structure of Multinuclear Pd(II) Complexes Bridged by Phosphide or Azide Ligands

Contact Info

Product

Resources

About