Diversity of Polyoxometalate‐Based Copper Compounds Obtained from the Same Reaction System

Buvailo, Halyna I.; Makhankova, Valeriya G.; Kokozay, Vladimir N.; Zatovsky, Іgor V.; Omelchenko, Irina V.; Shishkina, Svitlana V.; Zabierowski, Piotr; Matoga, Dariusz; Jezierska, Julia

doi:10.1002/ejic.201600976

Cited by 12 publications

(11 citation statements)

References 51 publications

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“…The respective potential/current curves are shown in Figure 6. [34] Each of the recorded voltammetric curves contains two irreversible cathodic waves for these low rates (C1 and C2) and at least two irreversible anodic waves (A1 and A2) in the studied potential range (20 mV/s; Figure 6). [34] Each of the recorded voltammetric curves contains two irreversible cathodic waves for these low rates (C1 and C2) and at least two irreversible anodic waves (A1 and A2) in the studied potential range (20 mV/s; Figure 6).…”

Section: Cyclic Voltammetric Behavior Of Cpesmentioning

confidence: 92%

“…The previously elaborated two techniques [34] [a direct synthesis (DS) with oxidative dissolution of metal powder and a "wet" method with metal salts] were used for the isolation of new compounds under mild conditions. A predictable discrete complex, 1, was obtained from both reaction systems: Co 0 / Co(NO 3 ) 2 -bpy-(NH 4 ) 2 HPO 4 or (NH 4 ) 6 Mo 7 O 24 -H 2 O.…”

Section: Synthesismentioning

confidence: 99%

“…The Co III formal oxidation-state description is strongly supported by bond lengths. [34] Since each Ca 2+ cation is linked with three polyoxoanions, the formal [Ca(P 2 Mo 5 O 23 ) 3/2 ] subunits in 2 ( Figure 3) represent three-connecting points, forming a well-defined 3D three-connected decagon net. There is also a number of weak C-H···O contacts between the hydrogen atoms of the bpy ligands and the oxygen atoms of the POM anions and water molecules.…”

Section: Crystal Structurementioning

confidence: 99%

“…The linear correlations of current peaks versus sweep rates below 150 mV/s (e.g., Figure S3 for CPE1) indicate surface-controlled processes, as was similarly observed for CPEs modified with heterometallic Cu/Mo or Cu/Mo/V polyoxometalates. [34] These are related to the reduction of Mo VI to Mo IV and its reoxidation in [P 2 Mo 5 O 23 ] 6-Strandberg anions, respectively. The peak potentials for the A and C waves depend on the structure (including dimensionality) of the investigated polyoxometalates and the chemical surrounding of the molybdenum ions, which are electrochemically active.…”

Section: Cyclic Voltammetric Behavior Of Cpesmentioning

confidence: 99%

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Ca²⁺‐Driven Self‐Assembly of POMs into 2D/3D Coordination Polymers

et al. 2017

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A number of new POM-based coordination polymers, including two-dimensional (NH 4 ) 4 {[Ca(H 2 O) 5 ][P 2 Mo 5 O 23 ]}· 3H 2 O (4) (bpy = 2,2′-bipyridine), and a rare anion-based (NH 4 ) 5 [Co III (bpy) 3 ]{[Ca(H 2 O) 4 ] 2 [Ca(H 2 O)] 6 [PMo 6 O 22 (PO 4 ) 3 ] 2 }· 17H 2 O (3), as well as three-dimensional (NH 4 ) 8 [Co III (bpy) 3 ] 2 -{[Ca(H 2 O) 3 ] 2 [P 2 Mo 5 O 23 ] 3 }·21H 2 O (2) have been prepared using a facile wet-chemistry approach and have been characterized by X-ray diffraction analysis and a variety of physicochemical methods. The self-assembly in the above compounds has been rendered by the use of Ca 2+ ions as a suitable linker in the [a] 3525 network formation. Moreover, Ca 2+ ions were also involved in the formation of an extremely rare type of POM anion {[Ca(H 2 O)] 6 [PMo 6 O 22 (PO 4 ) 3 ] 2 } 12-. The synthesis attempt without the alkaline-earth metal led, predictably, to the formation of the discrete Strandberg-based compound (NH 4 ) 3 [Co III (bpy) 3 ]-[P 2 Mo 5 O 23 ]·14H 2 O (1). Thus, the present work reports on a suitable strategy to influence complex POM-based systems towards self-organization into multidimensional structures of higher hierarchy. The obtained compounds have been shown to possess electrocatalytic activity towards the reduction of iodates(V).Some of the common strategies to obtain multidimensional POM-based coordination polymers include the binding of densely charged POM anions with various linkage units, such as functional organic ligands, transition metals, and metal complexes, as well as rare-earth metals. [9][10][11][12][13][14] The majority of the reports related to POM-based heterometallic compounds cover examples with Cu as a second metal, [15][16][17] while only a few publications mention the anions' combination with cobalt. [18,19] Co-containing compounds based on POMs have gained popularity in the development of wateroxidation catalysts and have shown better activity than the widespread copper complexes. [20,21] Another intriguing possibility is the use of alkaline-earth metals as promising templates for discovering new binding motifs with POMs. [22] With charge numbers similar to those of typical d-elements, and possessing coordination modes and sizes similar to lanthanide ions, the alkaline-earth metals offer new and largely underexplored tools for driving self-assembly in POM-based hybrids. [23] There are also a number of vanadiumbased polyanions linked by alkaline-earth metals. [24][25][26] Moreover, the influence of the size of the guest metal ions (Ca 2+ , Sr 2+ , or Ba 2+ ) on the arrangement of Pd II -oxo shells in polyoxo noble metalates has been demonstrated. [27] Inspired by the reported structure-directing template effect of the metals on the formation of POMs, we decided to study the influence of Ca 2+ and Sr 2+ ions on phosphomolybdate-based structures. According to the CCDC, most of the publications cover [P 6 Mo 18 O 73 ] 8and [P 4 Mo 6 O 28-x (OH) 3+x ] (9-x)based compounds with Ca, Sr, and (rarely) Ba. [28][29][30][31][32] Another unique hig...

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Section: Cyclic Voltammetric Behavior Of Cpesmentioning

confidence: 92%

Section: Synthesismentioning

confidence: 99%

Section: Crystal Structurementioning

confidence: 99%

Section: Cyclic Voltammetric Behavior Of Cpesmentioning

confidence: 99%

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Ca²⁺‐Driven Self‐Assembly of POMs into 2D/3D Coordination Polymers

et al. 2017

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“…[23][24][25][26][27] This paper is a continuation of our research devoted for the synthesis of hybrid compounds based on POMs under mild conditions. 3,4,[28][29][30] Our work is focused on the study of inuence of synthetic conditions such as the stoichiometry of reagent, metal sources in the reaction mixtures and the time of interaction. Previously…”

Section: Introductionmentioning

confidence: 99%