Immobilization of a copper-Schiff base complex in a Y-zeolite matrix: Preparation, chromogenic behavior and catalytic oxidation

Saha, Pritam; Dutta, Buddhadeb; Jana, Sourav Kanti; Bera, Rajesh; Saha, Sandip; Okamoto, Ken‐ichi; Koner, Subratanath

doi:10.1016/j.poly.2006.08.018

Cited by 68 publications

(35 citation statements)

References 38 publications

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“…In the first step, Ni(II) and Cu(II) have been used to bind to the N 2 O 2 cavity of L, yielding literature-known compounds 83−86 LNi and LCu, used further as ligands for alkali metal ions (detailed data on all the individual titrations can be found in the Supporting Information, Figures S2−S4). Solid state structures of the compounds LCu and LNi obtained as single crystals confirm the binding of the metal ions in the N 2 O 2 pocket of the Ω-shaped ligand 45,87,88 ( Figure S1). The difference between the two complexes is that in LCu, a water molecule coordinates the copper ion in order to yield a square pyramidal environment, while the nickel ion in LNi remains with a square planar coordination.…”

Section: ■ Results and Discussionmentioning

confidence: 65%

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Finelli

Hérault

Crochet

et al. 2018

Crystal Growth & Design

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Compartmentalization of metal ions is crucial in biology as well as in materials science. For the synthesis of single source precursors, the preorganization of different metal ions is of particular interest for the lowtemperature generation of mixed metal oxides. On the basis of a potentially Ω-shaped salen-type ligand providing an N 2 O 2 as well as an O 2 O 2 coordination site, mixed metal coordination compounds with Cu(II) or Ni(II) and alkali metal ions have been studied for their structural and optical properties. UV− vis and 1 H NMR titrations show that the obtained compounds adopt partially different structures in solution compared to the solid state. In the latter case, the coordination geometry is mainly governed by the size of the alkali metal ion as well as the transition metal ion used. ■ INTRODUCTIONThe precise arrangement and compartmentalization of metal ions are important both in biology as well as in materials science.1−5 Siderophores such as iron chelators produced by microbes are for example prototypes for metal specific uptaking agents. These could be used in industrial or environmental cleanup processes to selectively extract metal ions.6 Artificial systems such as salen (N,N′-disalicylidene-ethylenediamine) and its derivatives are commonly employed as versatile chelate ligands in coordination chemistry and obtained by a straightforward condensation reaction. 7 Containing two Schiff base 8 coordinating moieties, this family of ligands is able to bind to transition-metal ions in a tetradentate fashion forming stable complexes through its N 2 O 2 site. Furthermore, they represent versatile ligands type thanks to their tunable design. Several structural studies were undertaken on bi-or trinuclear mono-or heterometallic Schiff base complexes. 33−37Interesting trinuclear structures of Zn-salen based complexes were reported in Cai's work, by tuning the counterions, the solvent, or the reaction conditions. 68 A structural description of a binuclear Zn complex able to undergo transmetalation as well as polynuclear salen compounds was presented by Kleij and coworkers. 69,70 On the basis of salen-type ligands, Nabeshima et al. have described multiple-metal containing host−guest complexes using transmetalation reactions to incorporate the guest ions. 22,71 These ligands can adopt, depending on the ionic radius of the metal ions, a helical conformation in solution. 72,73 They also reported the first efficient and selective introduction of three different metal ions into one ligand under thermodynamic control. 4 While numerous transition metal ions were widely employed along with the salen-derived ligands for multiple purposes, the series with alkali metal ions remain however not entirely investigated. 21,74,75 Previous tests to use alkali ions as guests in larger H 2 L salen-type ligands using also transmetalation were unsuccessful.72 While a recent publication by the Nabeshima group deals with the formation of alkali metal ion complexes with macrocyclic ligands in solution, no 1

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Section: ■ Results and Discussionmentioning

confidence: 65%

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Finelli

Hérault

Crochet

et al. 2018

Crystal Growth & Design

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“…They are a kind of the acidic and redox catalysts for various reactions since their strong acidity and redox property can be controlled by replacing the protons with metal cations and/or by changing the heteroatom or the framework transition-metal atoms [7][8][9]. On the other hand, organic/ inorganic hybrid materials are extremely interesting as catalytic materials [10][11][12]. Hybrid materials composed by POMs and organic species not only have the advantages of organic species, such as the ease in processing and the structural fine tuning with inorganic clusters, but also the close interaction of organic delocalized p electrons with the inorganic d electrons may bring exciting synergistic effects [13].…”

Section: Introductionmentioning

confidence: 99%

Direct Hydroxylation of Benzene to Phenol with Molecular Oxygen over Pyridine-modified Vanadium-substituted Heteropoly Acids

Zhang

Zhou

et al. 2008

Catal Lett

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Pyridine(Py)-modified Keggin-type mono-vanadium-substituted heteropoly acids (Py n PMo 11 V, n = 1-4) were prepared by a precipitation method as organic/inorganic hybrid catalysts for direct hydroxylation of benzene to phenol in a pressured batch reactor and their structures were characterized by FT-IR. Among various catalysts, Py 4 PMo 11 V exhibited the highest catalytic activity (yield of phenol 9.0%) with the high selectivity for phenol, without observing the formation of catechol, hydroquinone and benzoquinone in the reaction with 80 vol% aqueous acetic acid, molecular oxygen and ascorbic acid used as the solvent, oxidant and reducing reagent, respectively. The influences of the reaction temperature, the pressure of oxygen, the amount of ascorbic acid, the amount of catalyst, and the reaction time on the yield of phenol were investigated to obtain the optimal reaction conditions for phenol formation. Pyridine can greatly promote the catalytic activity of the Py-free catalyst (H 4 PMo 11 VO 40 ), mostly because the organic p electrons in the hydrid catalyst may extend their conjugation to the inorganic framework of heteropoly acid and thus dramatically modify the redox properties.

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“…The photocatalytic selective oxidation of various hydrocarbons by photo-stable dimer-iron(III) bisporphine complexes has been reported to proceed under visible light irradiation with high turnover numbers and selectivity [9]. Furthermore, copper Schiff base complexes encapsulated within Y-zeolites as well as copper complexes anchored in mesoporous silica MCM-41 matrices have been reported to show excellent catalytic activity for the hydroxylation of phenol or 1-naphthol [10] and the epoxidation of olefins by tert-BuOOH [11], respectively. Recently, a platinum(II) complex loaded into the channels of ordered mesoporous silica, SBA-15, was also found to be stable and to induce the oxidation of olefins more efficiently than the platinum(II) complex in solution [12].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of the Ag+-Bipyridine Complexes Anchored within MCM-41 and their Photocatalytic Reactivity for N2O Reduction with CO

et al. 2008

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Immobilization of a copper-Schiff base complex in a Y-zeolite matrix: Preparation, chromogenic behavior and catalytic oxidation

Cited by 68 publications

References 38 publications

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Threading Salen-type Cu- and Ni-Complexes into One-Dimensional Coordination Polymers: Solution versus Solid State and the Size Effect of the Alkali Metal Ion

Direct Hydroxylation of Benzene to Phenol with Molecular Oxygen over Pyridine-modified Vanadium-substituted Heteropoly Acids

Synthesis of the Ag+-Bipyridine Complexes Anchored within MCM-41 and their Photocatalytic Reactivity for N2O Reduction with CO

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