The First Large‐Pore Vanadosilicate Framework Containing Hexacoordinated Vanadium

Rocha, João; Brandão, Paula; Lin, Zhi; Anderson, Michael W.; Alfredsson, Viveka; Terasaki, Osamu

doi:10.1002/anie.199701001

Cited by 68 publications

(71 citation statements)

References 8 publications

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“…[15] This material, dubbed AM-6, is a structural analogue of titanium silicate ETS-10, where titanium has been fully replaced by vanadium. ETS-10 has a framework consisting of ''TiO 2 '' rods, which run in two orthogonal directions and are surrounded by tetrahedral silicate units.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Characterisation of Two Novel Large‐Pore Framework Vanadium Silicates

et al. 2003

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Two new large-pore sodium vanadium silicates, denoted AM-15 and AM-17 (Aveiro-Manchester, structures number 15 and 17) with framework composition Na 6 Si 14 V 4 O 39 and Na 4 CaSi 10 V 2 O 27 , respectively, are reported. Electron paramagnetic resonance (EPR), Fourier transform infrared (FTIR) and diffuse reflectance ultraviolet-visible (DR UV/Vis) spectroscopy reveal that as-prepared AM-15 contains both V IV and V V in a square pyramidal and tetrahedral coordination,

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Section: Introductionmentioning

confidence: 99%

Hydrothermal Synthesis and Characterisation of Two Novel Large‐Pore Framework Vanadium Silicates

et al. 2003

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“…To the best of our knowledge, only one paper was reported on the synthesis of vanadosilicate AM-6 membranes, where a-alumina substrates were used as support [22]. In the current study, the ETS-10 core/AM-6 shell methodology was applied in the original formation of AM-6 crystals in powder form by using ETS-10 as seeds [10,16,17]. In that way, it was aimed to investigate the formation of AM-6 thin films on ITO coated glass substrates using ETS-10 as seeds for the first time, focusing on the quality of the quantum wires and the orientation of the crystallites in those films.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, AM-6 has novel magnetic and electric properties attributed to the valence state of vanadium in VO 3 2-quantum wire which could be easily manipulated by altering the oxidation state of vanadium [14]. Rocha et al [16] synthesized vanadosilicate AM-6 for the first time by adding ETS-10 as seed crystals into the growth solution with a molar composition of Na 2 O:0.23K 2 O:0.97SiO 2 :0.10V 2 O 5 :30H 2 O, which are named as ETS-10 core/AM-6 shell crystals. Then, Sacco, Jr. et al reported the first time synthesis of seedless vanadosilicate AM-6 crystals by using structure directing agent (SDA) with molar composition of 4.5Na 2 Yoon et al [17] synthesized seedless and template free AM-6 crystals for the first time in comparison with ETS-10 core/AM-6 shell crystals made by Rocha et al [16] and ETS-10-free AM-6 crystals containing tetramethylammonium ion (TMA ? )…”

Section: Introductionmentioning

confidence: 99%

Secondary growth of microporous vanadosilicate AM-6 films

2016

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Oriented vanadosilicate AM-6 thin films with an average thickness of 1-2 lm were prepared on the ITO coated glass substrates using secondary growth method with a partial a(b)-out-of-plane preferred crystal orientation for the first time. In secondary growth method, titanosilicate ETS-10 crystals were deposited on the substrate from a colloidal suspension to form seed layers. Then, the hydrothermal growth of the seed crystals was conducted to form AM-6 films. It was observed that the AM-6 films formed possess similar 1-D VO 3 2-quantum wires as also observed in powder AM-6 crystals. Afterward, the effect of reaction temperature and amount of water in the secondary growth gel on crystal morphology and a(b)-out-of-plane crystallographic preferred orientation (CPO) were investigated to gain a better understanding of the secondary growth mechanism of vanadosilicate AM-6 films. The results suggested that the increased amount of water leads to increased CPO in the AM-6 films, whereas an increase in reaction temperature from 503 to 528 K leads to more c-oriented AM-6 films with a decreased CPO value. Furthermore, an increase in the reaction temperature led to a decrease in the reaction time, resulting in the formation of quartz impurity. Accordingly, well intergrown a(b)-out-of-plane oriented vanadosilicate films were grown for the first time using ETS-10 seed crystals and it is believed that this work provides an effective pathway for controlling the synthesis of AM-6 films expanding the possible range of applications of these materials possessing 1-D quantum wires.

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“…5 In the absence of Ti, vanadosilicate AM-6 is obtained, which is isostructural to ETS-10. AM-6 is a microporous material composed of octahedral VO 6 and tetrahedral SiO 4 units. 6 The optical properties of AM-6 are the result of the one-dimensional -V-O-V-wires embedded into the insulating SiO 2 matrix.…”

mentioning

confidence: 99%

“…S1, ESIw). 6 The optical properties of AM-6 materials with different F/V molar ratios were characterized by UV-Vis absorption spectroscopy (Fig. 1).…”

mentioning

confidence: 99%

Enhancement of the visible light absorption intensity of microporous vanadosilicate AM-6

Guo¹,

Li²,

Fan³

et al. 2012

Chem. Commun.

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The First Large‐Pore Vanadosilicate Framework Containing Hexacoordinated Vanadium

Cited by 68 publications

References 8 publications

Hydrothermal Synthesis and Characterisation of Two Novel Large‐Pore Framework Vanadium Silicates

Hydrothermal Synthesis and Characterisation of Two Novel Large‐Pore Framework Vanadium Silicates

Secondary growth of microporous vanadosilicate AM-6 films

Enhancement of the visible light absorption intensity of microporous vanadosilicate AM-6

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