Synthesis, characterization, structure and catalytic activity of (NNN) tridentate azo-imine nickel(II), palladium(II) and platinum(II) complexes

Mandal, Paritosh; Lin, Chia Her; Brandão, Paula; Mal, Dasarath; Félix, Vítor; Pratihar, Jahar Lal

doi:10.1016/j.poly.2015.12.050

Cited by 20 publications

(9 citation statements)

References 62 publications

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“…The Ni−N bond length of the amido group (1.801(3) Å) has been reported to be shorter than that of the amino group (1.945(3) Å). 29 The slight elongation of the Ni−N bonds of Ni(2) was attributed to the lack of hydrogen bonding with counter anions. In addition, 1• solvent contained both Ni(II) and Ni(III), as revealed by magnetic measurements (vide infra).…”

Section: ■ Introductionmentioning

confidence: 54%

“…The deprotonation of the amino groups was negligible because the Ni–N bond lengths of Ni(2) (2.072(5) Å) were not shorter than those of Ni(1) (1.990(4) and 1.994(4) Å) (Table S2). The Ni–N bond length of the amido group (1.801(3) Å) has been reported to be shorter than that of the amino group (1.945(3) Å) . The slight elongation of the Ni–N bonds of Ni(2) was attributed to the lack of hydrogen bonding with counter anions.…”

Section: Resultsmentioning

confidence: 97%

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Ni(III) Mott–Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound

et al. 2022

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Halogen-bridged linear chain metal complexes (MX-Chains) are fascinating compounds that have a quasi-one-dimensional (1D) electronic system. In this study, we synthesized the first Ni-based MX-Chain compound having hydroxy groups, i.e., [Ni(dabdOH)2Br]Br2·[Ni(dabdOH x )2Br]0.5·(2-PrOH)0.25·(MeOH)0.25 (1·solvent, x = ∼0.6, dabdOH = (2S,3S)-2,3-diaminobutane-1,4-diol). Single-crystal X-ray diffraction revealed that the MX-Chains in 1·solvent formed sheets and single-chain structures in the superlattice. It suggested an MH-like state, whereas the polarized reflection and Raman spectra suggested a CDW-like state. Magnetic and electron spin resonance measurements revealed that both high-spin Ni(II) (∼15%) and low-spin Ni(III) (∼85%) sites are present in the chain structures, i.e., the metal sites show mixed valency. Therefore, we concluded that 1·solvent adopts an intermediate state between the MH and CDW states. Moreover, a single crystal of 1·solvent exhibited semiconductive characteristics along the chain direction. This finding represents a new structural and electronic state of 1D electronic systems as well as MX-Chains.

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Section: ■ Introductionmentioning

confidence: 54%

Section: Resultsmentioning

confidence: 97%

Ni(III) Mott–Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound

et al. 2022

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“…The employment of rigid groups (fixed geometries and dimensions) as linkers is a rational approach for the design of CPs of varying pore size and geometry. Algorithms that determine the possible topological isomers from the geometries of the nodes and linkers are available. , The rigidity of N-donor bridging ligands, such as imidazole, triazole, pyrazine, 4,4′-bipyridine, 4,4′-azopyridine, and 1,2-di(4-pyridyl)ethylene (bpe), has been reported to result in a range of interesting properties. For example, a Zn(bpe)–MOF undergoes a bpe-based photochemical [2 + 2] cycloaddition reaction converting bpe’s to cyclobutene-containing linkers, with the overall MOF structure persisting during the chemical transformation thanks to the rigidity of the linkers .…”

Section: Introductionmentioning

confidence: 99%

Three Topological Isomers of 1D- and 2D-Coordination Polymers Consisting of Tricopper Pyrazolate SBUs and 4,4′-Trimethylenedipyridine Linkers: Effect of Pressure on the Structure

Shi

Drozd

Raptis

2018

Crystal Growth & Design

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Three topologically isomeric coordination polymers of formula [CuII 3(μ3-OH)(μ-Cl)(μ-pz)3Cl(tmpy)] n , consisting of triangular CuII–pyrazolate structural building units and flexible 4,4′-trimethylenedipyridine linkers, have been prepared and structurally characterized as 1D- and 2D-coordination polymers. Powder X-ray diffraction (PXRD) patterns under variable pressure (ambient, 8 GPa) reveal a reversible compression of the lattice up to ∼4 GPa, followed by the loss of crystallinity at higher pressure. Single-crystal X-ray diffraction data, collected using synchrotron radiation under pressure of 1 GPa, corroborate the PXRD, showing a lattice compression forcing the C–C–C angles of the trimethylene moiety of the linkers to become more obtuse.

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“…As an example, 2,2′-(bisdiamino)azobenzene ligands (H 2 L) complexing Pd ([(HL)Pd(PPh 3 )]ClO 4 ) was used as a catalyst (1 mol%) in refluxing THF for Heck coupling of iodobenzene with styrene. trans -stilbene was isolated in 94% yield [ 34 ]. This result compares well with 90–98% conversion obtained in our case ( Table 1 ).…”

Section: Discussionmentioning

confidence: 99%

Dendrimers Functionalized with Palladium Complexes of N-, N,N-, and N,N,N-Ligands

et al. 2021

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Pyridine, pyridine imine, and bipyridine imine ligands functionalized by a phenol have been synthesized and characterized, in many cases by X-ray diffraction. Several of these N-, N,N-, and N,N,N,-ligands have been grafted onto the surface of phosphorhydrazone dendrimers, from generation 1 to generation 3. The complexation ability of these monomers and dendrimers towards palladium(II) has been assayed. The corresponding complexes have been either isolated or prepared in situ. In both cases, the monomeric and dendritic complexes have been tested as catalysts in Heck couplings and in Sonogashira couplings. In some cases, a positive dendritic effect has been observed, that is, an increase of the catalytic efficiency proportional to the dendrimer generation.

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Synthesis, characterization, structure and catalytic activity of (NNN) tridentate azo-imine nickel(II), palladium(II) and platinum(II) complexes

Cited by 20 publications

References 62 publications

Ni(III) Mott–Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound

Ni(III) Mott–Hubbard-like State Containing High-Spin Ni(II) in a Semiconductive Bromide-Bridged Ni-Chain Compound

Three Topological Isomers of 1D- and 2D-Coordination Polymers Consisting of Tricopper Pyrazolate SBUs and 4,4′-Trimethylenedipyridine Linkers: Effect of Pressure on the Structure

Dendrimers Functionalized with Palladium Complexes of N-, N,N-, and N,N,N-Ligands

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