Synthesis, characterization, structure and magnetic properties of azido-bridged nickel(II) and copper(II) complexes with a pyridylpyrazole-based ligand

Mahendrasinh, Zala; Kumar, Sujit Baran; Suresh, Eringathodi; Ribas, Joan

doi:10.1007/s11243-010-9390-x

Cited by 17 publications

(3 citation statements)

References 40 publications

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“…Dichloroethane, acetonitrile and ether, were dried using appropriate drying agents under nitrogen before use. The ligands S-bis[ (3, C H A R T 1 Examples of chromium complexes for oligomerization catalysis based on ligands bearing pendant donor groups methyl]sulfide (1a), [57] N-bis[ (3,methyl]benzylamine (1b), [58,59] N-bis[(3,5-DMPz)methyl]butylamine (1c), [58,59] and N-bis [2][3]methyl][(2-pyridinyl) methyl]amine (1d), [60,61] (DMPz = dimethylpyrazolyl) were prepared following the literature procedures. CrCl 3 (THF) 3 (Sigma-Aldrich) was used as received.…”

Section: General Proceduresmentioning

confidence: 99%

Bis(pyrazolyl)thioether/amine‐chromium(III) catalysts bearing pendantO‐ andN‐donor group for oligomerization and polymerization of ethylene

Oliveria

Oliboni

Stieler

et al. 2022

Applied Organom Chemis

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In this work, a new family of chromium complexes supported by bis(pyrazolyl)thioether/amine ligands containing pendant O‐ and N‐donor groups CrCl3{S‐bis[(3,5‐DMPz)methyl]sulfide} (2a), CrCl3{N‐bis[(3,5‐DMPz)benzylamine]} (2b), CrCl3{N‐bis[(3,5‐DMPz)butylamine]} (2c), [CrCl2{N‐bis[(3,5‐DMPz)methyl][(2‐pyridinyl)methyl]amine}]Cl (2d), [CrCl2{N‐bis[(3,5‐DMPz)methyl][quinoline]amine}]Cl (2e), [CrCl2{N‐bis[3,5‐DMPz‐methyl][EtNMe2]amine}]Cl (2f), CrCl3{N‐bis[(3,5‐DMPz)methyl][2‐methoxyphenyl]amine} (2g), and CrCl3{N‐bis[2‐(3,5‐DMPz)methyl][(2‐pyridyl)ethyl]amine} (2h) were synthetized and characterized by elemental analysis and Fourier transform infrared spectroscopy (FTIR) spectroscopy. Density functional theory (DFT) calculations demonstrated that the pendant group as well as the spacer between the N‐donor group and the central amine nitrogen have strong influence on the coordination motif of the ligand. Thus, 1d–1f act as tetradentate ligands while 1g and 1h preferably coordinated to the chromium metal center in a tridentate [N,N,N] mode fashion. The catalytic performance of 2a–2h is strongly influenced by the nature of the central bridging atom (S, N) as well as the pendant O‐ and N‐donor group. Upon activation with methylaluminoxane (MAO), chromium precatalysts 2a–2c, 2e, and 2f generated active systems producing oligomers ranging from C4 to C12+ with a high selectivity for α‐olefins (>82.4%). On the other hand, precatalysts bearing pyridine (2d and 2h) and methoxy (2g) functionalized amine bis (pyrazolyl) ligands exclusively produce polyethylene (PE) with activities in the range of 107.2–372.0 kg of PE·mol[Cr]−1 h−1.

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Section: General Proceduresmentioning

confidence: 99%

Bis(pyrazolyl)thioether/amine‐chromium(III) catalysts bearing pendantO‐ andN‐donor group for oligomerization and polymerization of ethylene

Oliveria

Oliboni

Stieler

et al. 2022

Applied Organom Chemis

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“…The design and synthesis of extended bridged polymetallic complexes continue to be the focus of much attention owing to their potential applications in magneto-and materials chemistry. 1 -7 Many extended bridged dinuclear complexes such as μterephthalate, 8 -11 μ-oxalate, 12 -17 μ-N 3 , [18][19][20][21] μ-butene dicarboxylate 22 and μsuccinate 23 have been synthesized. In our previous report, 11 ,23 we used rigid terephthalic acid and flexible succinic acid ligand bridging macrocyclic nickel(II) complexes to construct one-dimensional hydrogen bonded helical chains.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and crystal structures of three isophthalato-bridged macrocyclic nickel(II) complexes

Yuan

et al. 2015

J Chem Sci

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Three dinuclear isophthalato-bridged nickel(II) complexes formulated as [Ni(rac-L)] 2 (μ-IPA)(ClO 4) 2 (1), [Ni(RR-L)] 2 (μ-IPA)(ClO 4) 2 (2) and [Ni(SS-L)] 2 (μ-IPA)(ClO 4) 2 (3) (L = 5,5,7,12,12,14hexamethyl-1,4,8,11-tetraazacyc-lotetradecane, IPA = isophthalic acid) have been isolated and characterized. Single crystal X-ray diffraction analyses revealed that the Ni(II) atoms have six-coordinated distorted octahedral environments, and the isophthalato ligand bridges two Ni(II) centres in a bis bidentate fashion to form dimers in all three complexes. The monomers of {[Ni(SS-L)] 2 (μ-IPA)} 2+ are connected through intermolecular hydrogen bonds to generate one-dimensional left-handed helical chains in complex 3. The homochiral natures of complexes 2 and 3 have been confirmed by CD spectroscopy.

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“…The design and synthesis of extended bridged polymetallic complexes have attracted special attention due to their potential applications in magneto‐ and materials chemistry 1–7. Many dinuclear complexes, where the metal ions are bridged by extended multidentate ligands such as μ‐terephthalate,8–11 μ‐oxalate,12–17 μ‐N 3 ,18–21 and μ‐butene dicarboxylate,22 have been reported. In our previous report,11 we used rigid terephthalic acid ligand bridging macrocyclic nickel(II) complexes to construct 1D hydrogen bonded helical chains.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Crystal Structure of Two Succinato‐Bridged Macrocyclic Nickel(II) Complexes

Yuan

2012

Zeitschrift anorg allge chemie

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Two dinuclear succinato-bridged nickel(II) complexes [Ni(RR-L)] 2 (μ-SA)(ClO 4 ) 2 (1) and [Ni(SS-L)] 2 (μ-SA)(ClO 4 ) 2 (2) (L = 5,5,7,12,12,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane, SA = succinic acid) were synthesized and characterized by EA, Circular dichroism (CD), as well as IR and UV/Vis spectroscopy. Single crystal X-ray diffraction analyses revealed that the Ni II atoms display a distorted octahedral coordination arrangement, and the succinato ligand * Dr. G. C. Ou

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Synthesis, characterization, structure and magnetic properties of azido-bridged nickel(II) and copper(II) complexes with a pyridylpyrazole-based ligand

Cited by 17 publications

References 40 publications

Bis(pyrazolyl)thioether/amine‐chromium(III) catalysts bearing pendantO‐ andN‐donor group for oligomerization and polymerization of ethylene

Bis(pyrazolyl)thioether/amine‐chromium(III) catalysts bearing pendantO‐ andN‐donor group for oligomerization and polymerization of ethylene

Synthesis and crystal structures of three isophthalato-bridged macrocyclic nickel(II) complexes

Synthesis and Crystal Structure of Two Succinato‐Bridged Macrocyclic Nickel(II) Complexes

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